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Finding the most difficult questions in the database based on the percentage of students who got it correct. A low percentage indicates the question is quite difficult. The questions are presented in order starting with the toughest. Some of them have come from the examiner comment. Note this only works for some questions since not all questions have ever been answered or mentioned in examiner comments. Some topic/keyword combinations will therefore yield zero results.

Finding the least difficult questions in the database based on the percentage of students who got it correct. A high percentage indicates the question is quite easy. The questions are presented in order starting with the easiest. Some of these have come from the examiner comment. Note this only works for some questions since not all questions have ever been answered or mentioned in examiner comments. Some topic/keyword combinations will therefore yield zero results.

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Keyword:	KEYWORD - acid rain action of enzymes on glucose active & passive immunity active site and substrate active transport active transport and diffusion active transport diffusion osmosis adaptation addictive drugs adrenaline aerobic respiration aerobic respiration in plants affected by environment albinism alcohol alimentary canal allele alveolus amino acid breakdown amylase anabolic steroid anaemia anaerobic respiration anaerobic respiration in yeast animal and plant cells animal cell antibiotic immunity antibiotic resistance antibiotics antibodies arm movement arthropods artificial selection asexual and sexual reproduction asexual reproduction assimilation diffusion osmosis translocation assimilation, digestion, ingestion, peristalsis atmosphere auxins bacteria virus fungus bacterium balanced diet basic units of large food molecules bile binomial system biodiversity birth control birth rates blood blood cells blood clotting blood glucose blood groups blood vessels body mass index bones brain breast milk breathing breathing rate breathing system broken calcium capillaries and tissues capillaries arteries and veins capillary capillary walls carbon carbon and water cycle carbon concentration in atmosphere carbon cycle carbon dioxide carbon monoxide carbon nitrogen or water cycle catalysts causes of heart attack cell functions cell membrane cell processes cell specialism cell structure cell structure - leaf cell surface membranes cells and tissues central nervous system characteristics of amphibians characteristics of annelids & arthropods characteristics of arthropods characteristics of fish characteristics of insects characteristics of invertebrates characteristics of living organisms characteristics of mammals characteristics of plants characteristics of vertebrates cheese production chemical digestion chewing childbirth chloroplasts cholera chromosomes chromosomes and mitosis cilia ciliated cells circulatory system circulatory system in fish and mammal classification co-dominance colour blindness conservation constipation continuous and discontinuous variation contraception control spread of disease coronary heart disease cross-pollination cuttings cycles cystic fibrosis deamination of amino acid decomposition decomposition of oil by microbes deficiency deforestation development of organism diabetes diabetes mellitus dichotomous keys dicotyledonous plant diet dietary fibre diffusion diffusion osmosis transpiration translocation diffusion, osmosis, respiration digestion digestion -fats digestion -protein digestion in liver digestive enzymes digestive system diploid meiosis diploid nucleus discontinuous variation disease disease causing organisms DNA dominant allele dominant phenotype drug abuse dry mass of a plant duplicate ecosystem egestion endocrine glands energy energy flow through environment enzyme - definition enzyme - effect of pH enzyme - effect of temperature enzyme activity and temperature enzyme and substrate enzymes eutrophication evaporation of sweat evolution excretion excretion movement nutrition respiration exercise expiration extinction eye fat digestion feeding relationships fermentation fermenter fertilisation fertilisers flaccid flood prevention flow of energy in ecosystem flowering plants food chain food chain, food web, nutrient cycle, ecosystem food chains food chains webs ecosystems and cycles food chemical structure food groups food relationships food tests food webs frog skin fungus gall bladder gametes and chromosomes gas exchange genetic diseases genetic diversity genetic engineering genetically modified organisms genetics genotypes geotropism germination of seeds global warming glucose concentration in blood glycogen, protein & starch gravitropism green plants production of carbon dioxide greenhouse effect groups and kingdoms growth growth in arthropod growth in humans growth, nutrition, reproduction & respiration guard cell haemoglobin haemophilia haploid haploid nuclei heart heart rate herbicides and pesticides heroin heterozygous homozygous HIV homeostasis homozygous hormone hormone glands hormones hormones - testosterone human blood groups human gametes human influences on the environment hydration hydrophyte identification identify cell identify micoorganism identifying organs ileum immunity in vitro fertilisation ingestion inhaled and exhaled air insecticide insulin insulin production invertebrates iron deficiency joints KEYWORD kidney kidney dialysis kwashiorkor lactic acid and exercise lactose free milk leaf adaptation leaf cells leaf cells - water loss leaf functions leaf processes leaf structure leaf structure -cell organ system tissue leaf structure -photosynthesis level of organisation lipase liver liver and palisade cell liver cell liver functions lock and key lungs lymphatic system magnesium deficiency magnification malaria malnutrition mechanism of absorption meiosis meiosis and mitosis menstrual cycle mesophyll cell metabolism microbes minerals and vitamins mitochondria mitosis mitosis and meiosis monocotyledon motor and sensory neurones movement movement of gases in and out of cell mRNA MRSA muscle groups muscles and bones mutations natural birth control natural selection negative feedback negative geotropism nervous system neurone nicotine nitrates nitrates deficiency nitrogen cycle nucleus of gametes and zygotes nutrients from soil nutrition organ for breakdown of amino acids organs and systems osmosis osmosis -water potential osmosis and diffusion ovulation oxygen as a waste product oxygen concentration in water oxygen debt oxygen diffusion oxygen root hair cells palisade cell pancreas passive immunity pathogen penicillin percentage of offspring peristalsis permeable structures pesticides pesticides and food chains ph in mouth phenotype phloem phloem and xylem phloem cells photosynthesis photosynthesis & respiration phototropism & phototaxis placenta plant cell plant deficiency plant growth plant hormones plant nutrition plant reproduction plant respiration plant root plant root cell plant structure plasma and tissue fluid pollination pollination by insects pollution population population changes population pyramid pregnancy producers protease protein synthesis proteins pyramid of biomass pyramid of numbers pyramids rate of reaction rate of water uptake in a shoot recessive allele recycling red blood cells reduction division reflex - pupil reflex action reflex arc relay neurones removal of excretory products from blood renewable resources reproduction reproduction female reproduction in plants and animals reproduction stages in human reproductive system female reproductive system male respiration respiration of yeast respiratory system rickets root hair root hair cell roots as a source & sink roots stem & leaf saliva scurvy seed dispersal selective breeding self-pollination sensory neurone sewage sex chromosomes sex determination sex hormones sexual & asexual reproduction sexual reproduction sickle cell anaemia simple keys skin cells small intestine smoking smoking and cancer smoking and pregnancy species & genus sperm cell sprouting plants STD structure of plant cell substrate sulphur dioxide pollution sustainability sweating synapse synthesis of large molecules syphilis teeth temperature balance thorax tissue organ and systems trachea tranference of gene translocation transmissible disease transpiration transport transport in plants trophic level urea urea in blood and kidneys urinary system urine use of minerals vaccination valves in veins variation vasoconstriction vertebrate group villus virus vitamin c water and plants water balance water cycle water loss water potential white blood cells wind pollination adaptation xerophyte xylem yeast yeast respiration yoghurt production zygote	this is topic box
Topic:	TOPIC-biological moleculesbrokencell structurecharacteristics and classificationcoordination response and homeostasisdiseases and immunityduplicateenzymesexcretion in humanshuman influenceshuman reproductioninheritancemicroorganisms and biotechnologymovement into and out of cellsnutrition in animals & humansnutrition in animals & humansorganisms and their environmentplant nutrition and transportreproduction in plantsrespirationsexual and asexual reproductionsupport, movement and locomotiontransport in animalstropic responseuse and abuse of drugsvariation and selection	topic box
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Keyword:	KEYWORD - acid rain action of enzymes on glucose active & passive immunity active site and substrate active transport active transport and diffusion active transport diffusion osmosis adaptation addictive drugs adrenaline aerobic respiration aerobic respiration in plants affected by environment albinism alcohol alimentary canal allele alveolus amino acid breakdown amylase anabolic steroid anaemia anaerobic respiration anaerobic respiration in yeast animal and plant cells animal cell antibiotic immunity antibiotic resistance antibiotics antibodies arm movement arthropods artificial selection asexual and sexual reproduction asexual reproduction assimilation diffusion osmosis translocation assimilation, digestion, ingestion, peristalsis atmosphere auxins bacteria virus fungus bacterium balanced diet basic units of large food molecules bile binomial system biodiversity birth control birth rates blood blood cells blood clotting blood glucose blood groups blood vessels body mass index bones brain breast milk breathing breathing rate breathing system broken calcium capillaries and tissues capillaries arteries and veins capillary capillary walls carbon carbon and water cycle carbon concentration in atmosphere carbon cycle carbon dioxide carbon monoxide carbon nitrogen or water cycle catalysts causes of heart attack cell functions cell membrane cell processes cell specialism cell structure cell structure - leaf cell surface membranes cells and tissues central nervous system characteristics of amphibians characteristics of annelids & arthropods characteristics of arthropods characteristics of fish characteristics of insects characteristics of invertebrates characteristics of living organisms characteristics of mammals characteristics of plants characteristics of vertebrates cheese production chemical digestion chewing childbirth chloroplasts cholera chromosomes chromosomes and mitosis cilia ciliated cells circulatory system circulatory system in fish and mammal classification co-dominance colour blindness conservation constipation continuous and discontinuous variation contraception control spread of disease coronary heart disease cross-pollination cuttings cycles cystic fibrosis deamination of amino acid decomposition decomposition of oil by microbes deficiency deforestation development of organism diabetes diabetes mellitus dichotomous keys dicotyledonous plant diet dietary fibre diffusion diffusion osmosis transpiration translocation diffusion, osmosis, respiration digestion digestion -fats digestion -protein digestion in liver digestive enzymes digestive system diploid meiosis diploid nucleus discontinuous variation disease disease causing organisms DNA dominant allele dominant phenotype drug abuse dry mass of a plant duplicate ecosystem egestion endocrine glands energy energy flow through environment enzyme - definition enzyme - effect of pH enzyme - effect of temperature enzyme activity and temperature enzyme and substrate enzymes eutrophication evaporation of sweat evolution excretion excretion movement nutrition respiration exercise expiration extinction eye fat digestion feeding relationships fermentation fermenter fertilisation fertilisers flaccid flood prevention flow of energy in ecosystem flowering plants food chain food chain, food web, nutrient cycle, ecosystem food chains food chains webs ecosystems and cycles food chemical structure food groups food relationships food tests food webs frog skin fungus gall bladder gametes and chromosomes gas exchange genetic diseases genetic diversity genetic engineering genetically modified organisms genetics genotypes geotropism germination of seeds global warming glucose concentration in blood glycogen, protein & starch gravitropism green plants production of carbon dioxide greenhouse effect groups and kingdoms growth growth in arthropod growth in humans growth, nutrition, reproduction & respiration guard cell haemoglobin haemophilia haploid haploid nuclei heart heart rate herbicides and pesticides heroin heterozygous homozygous HIV homeostasis homozygous hormone hormone glands hormones hormones - testosterone human blood groups human gametes human influences on the environment hydration hydrophyte identification identify cell identify micoorganism identifying organs ileum immunity in vitro fertilisation ingestion inhaled and exhaled air insecticide insulin insulin production invertebrates iron deficiency joints KEYWORD kidney kidney dialysis kwashiorkor lactic acid and exercise lactose free milk leaf adaptation leaf cells leaf cells - water loss leaf functions leaf processes leaf structure leaf structure -cell organ system tissue leaf structure -photosynthesis level of organisation lipase liver liver and palisade cell liver cell liver functions lock and key lungs lymphatic system magnesium deficiency magnification malaria malnutrition mechanism of absorption meiosis meiosis and mitosis menstrual cycle mesophyll cell metabolism microbes minerals and vitamins mitochondria mitosis mitosis and meiosis monocotyledon motor and sensory neurones movement movement of gases in and out of cell mRNA MRSA muscle groups muscles and bones mutations natural birth control natural selection negative feedback negative geotropism nervous system neurone nicotine nitrates nitrates deficiency nitrogen cycle nucleus of gametes and zygotes nutrients from soil nutrition organ for breakdown of amino acids organs and systems osmosis osmosis -water potential osmosis and diffusion ovulation oxygen as a waste product oxygen concentration in water oxygen debt oxygen diffusion oxygen root hair cells palisade cell pancreas passive immunity pathogen penicillin percentage of offspring peristalsis permeable structures pesticides pesticides and food chains ph in mouth phenotype phloem phloem and xylem phloem cells photosynthesis photosynthesis & respiration phototropism & phototaxis placenta plant cell plant deficiency plant growth plant hormones plant nutrition plant reproduction plant respiration plant root plant root cell plant structure plasma and tissue fluid pollination pollination by insects pollution population population changes population pyramid pregnancy producers protease protein synthesis proteins pyramid of biomass pyramid of numbers pyramids rate of reaction rate of water uptake in a shoot recessive allele recycling red blood cells reduction division reflex - pupil reflex action reflex arc relay neurones removal of excretory products from blood renewable resources reproduction reproduction female reproduction in plants and animals reproduction stages in human reproductive system female reproductive system male respiration respiration of yeast respiratory system rickets root hair root hair cell roots as a source & sink roots stem & leaf saliva scurvy seed dispersal selective breeding self-pollination sensory neurone sewage sex chromosomes sex determination sex hormones sexual & asexual reproduction sexual reproduction sickle cell anaemia simple keys skin cells small intestine smoking smoking and cancer smoking and pregnancy species & genus sperm cell sprouting plants STD structure of plant cell substrate sulphur dioxide pollution sustainability sweating synapse synthesis of large molecules syphilis teeth temperature balance thorax tissue organ and systems trachea tranference of gene translocation transmissible disease transpiration transport transport in plants trophic level urea urea in blood and kidneys urinary system urine use of minerals vaccination valves in veins variation vasoconstriction vertebrate group villus virus vitamin c water and plants water balance water cycle water loss water potential white blood cells wind pollination adaptation xerophyte xylem yeast yeast respiration yoghurt production zygote	this is topic box
Topic:	TOPIC-biological moleculesbrokencell structurecharacteristics and classificationcoordination response and homeostasisdiseases and immunityduplicateenzymesexcretion in humanshuman influenceshuman reproductioninheritancemicroorganisms and biotechnologymovement into and out of cellsnutrition in animals & humansnutrition in animals & humansorganisms and their environmentplant nutrition and transportreproduction in plantsrespirationsexual and asexual reproductionsupport, movement and locomotiontransport in animalstropic responseuse and abuse of drugsvariation and selection	topic box
HINT: Tag keyword first and a found topic may be added automatically.

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Maybe you could help other users of this database by tagging a topic and a keyword.    Click here if you do not wish to help

Keyword:	KEYWORD - acid rain action of enzymes on glucose active & passive immunity active site and substrate active transport active transport and diffusion active transport diffusion osmosis adaptation addictive drugs adrenaline aerobic respiration aerobic respiration in plants affected by environment albinism alcohol alimentary canal allele alveolus amino acid breakdown amylase anabolic steroid anaemia anaerobic respiration anaerobic respiration in yeast animal and plant cells animal cell antibiotic immunity antibiotic resistance antibiotics antibodies arm movement arthropods artificial selection asexual and sexual reproduction asexual reproduction assimilation diffusion osmosis translocation assimilation, digestion, ingestion, peristalsis atmosphere auxins bacteria virus fungus bacterium balanced diet basic units of large food molecules bile binomial system biodiversity birth control birth rates blood blood cells blood clotting blood glucose blood groups blood vessels body mass index bones brain breast milk breathing breathing rate breathing system broken calcium capillaries and tissues capillaries arteries and veins capillary capillary walls carbon carbon and water cycle carbon concentration in atmosphere carbon cycle carbon dioxide carbon monoxide carbon nitrogen or water cycle catalysts causes of heart attack cell functions cell membrane cell processes cell specialism cell structure cell structure - leaf cell surface membranes cells and tissues central nervous system characteristics of amphibians characteristics of annelids & arthropods characteristics of arthropods characteristics of fish characteristics of insects characteristics of invertebrates characteristics of living organisms characteristics of mammals characteristics of plants characteristics of vertebrates cheese production chemical digestion chewing childbirth chloroplasts cholera chromosomes chromosomes and mitosis cilia ciliated cells circulatory system circulatory system in fish and mammal classification co-dominance colour blindness conservation constipation continuous and discontinuous variation contraception control spread of disease coronary heart disease cross-pollination cuttings cycles cystic fibrosis deamination of amino acid decomposition decomposition of oil by microbes deficiency deforestation development of organism diabetes diabetes mellitus dichotomous keys dicotyledonous plant diet dietary fibre diffusion diffusion osmosis transpiration translocation diffusion, osmosis, respiration digestion digestion -fats digestion -protein digestion in liver digestive enzymes digestive system diploid meiosis diploid nucleus discontinuous variation disease disease causing organisms DNA dominant allele dominant phenotype drug abuse dry mass of a plant duplicate ecosystem egestion endocrine glands energy energy flow through environment enzyme - definition enzyme - effect of pH enzyme - effect of temperature enzyme activity and temperature enzyme and substrate enzymes eutrophication evaporation of sweat evolution excretion excretion movement nutrition respiration exercise expiration extinction eye fat digestion feeding relationships fermentation fermenter fertilisation fertilisers flaccid flood prevention flow of energy in ecosystem flowering plants food chain food chain, food web, nutrient cycle, ecosystem food chains food chains webs ecosystems and cycles food chemical structure food groups food relationships food tests food webs frog skin fungus gall bladder gametes and chromosomes gas exchange genetic diseases genetic diversity genetic engineering genetically modified organisms genetics genotypes geotropism germination of seeds global warming glucose concentration in blood glycogen, protein & starch gravitropism green plants production of carbon dioxide greenhouse effect groups and kingdoms growth growth in arthropod growth in humans growth, nutrition, reproduction & respiration guard cell haemoglobin haemophilia haploid haploid nuclei heart heart rate herbicides and pesticides heroin heterozygous homozygous HIV homeostasis homozygous hormone hormone glands hormones hormones - testosterone human blood groups human gametes human influences on the environment hydration hydrophyte identification identify cell identify micoorganism identifying organs ileum immunity in vitro fertilisation ingestion inhaled and exhaled air insecticide insulin insulin production invertebrates iron deficiency joints KEYWORD kidney kidney dialysis kwashiorkor lactic acid and exercise lactose free milk leaf adaptation leaf cells leaf cells - water loss leaf functions leaf processes leaf structure leaf structure -cell organ system tissue leaf structure -photosynthesis level of organisation lipase liver liver and palisade cell liver cell liver functions lock and key lungs lymphatic system magnesium deficiency magnification malaria malnutrition mechanism of absorption meiosis meiosis and mitosis menstrual cycle mesophyll cell metabolism microbes minerals and vitamins mitochondria mitosis mitosis and meiosis monocotyledon motor and sensory neurones movement movement of gases in and out of cell mRNA MRSA muscle groups muscles and bones mutations natural birth control natural selection negative feedback negative geotropism nervous system neurone nicotine nitrates nitrates deficiency nitrogen cycle nucleus of gametes and zygotes nutrients from soil nutrition organ for breakdown of amino acids organs and systems osmosis osmosis -water potential osmosis and diffusion ovulation oxygen as a waste product oxygen concentration in water oxygen debt oxygen diffusion oxygen root hair cells palisade cell pancreas passive immunity pathogen penicillin percentage of offspring peristalsis permeable structures pesticides pesticides and food chains ph in mouth phenotype phloem phloem and xylem phloem cells photosynthesis photosynthesis & respiration phototropism & phototaxis placenta plant cell plant deficiency plant growth plant hormones plant nutrition plant reproduction plant respiration plant root plant root cell plant structure plasma and tissue fluid pollination pollination by insects pollution population population changes population pyramid pregnancy producers protease protein synthesis proteins pyramid of biomass pyramid of numbers pyramids rate of reaction rate of water uptake in a shoot recessive allele recycling red blood cells reduction division reflex - pupil reflex action reflex arc relay neurones removal of excretory products from blood renewable resources reproduction reproduction female reproduction in plants and animals reproduction stages in human reproductive system female reproductive system male respiration respiration of yeast respiratory system rickets root hair root hair cell roots as a source & sink roots stem & leaf saliva scurvy seed dispersal selective breeding self-pollination sensory neurone sewage sex chromosomes sex determination sex hormones sexual & asexual reproduction sexual reproduction sickle cell anaemia simple keys skin cells small intestine smoking smoking and cancer smoking and pregnancy species & genus sperm cell sprouting plants STD structure of plant cell substrate sulphur dioxide pollution sustainability sweating synapse synthesis of large molecules syphilis teeth temperature balance thorax tissue organ and systems trachea tranference of gene translocation transmissible disease transpiration transport transport in plants trophic level urea urea in blood and kidneys urinary system urine use of minerals vaccination valves in veins variation vasoconstriction vertebrate group villus virus vitamin c water and plants water balance water cycle water loss water potential white blood cells wind pollination adaptation xerophyte xylem yeast yeast respiration yoghurt production zygote	this is topic box
Topic:	TOPIC-biological moleculesbrokencell structurecharacteristics and classificationcoordination response and homeostasisdiseases and immunityduplicateenzymesexcretion in humanshuman influenceshuman reproductioninheritancemicroorganisms and biotechnologymovement into and out of cellsnutrition in animals & humansnutrition in animals & humansorganisms and their environmentplant nutrition and transportreproduction in plantsrespirationsexual and asexual reproductionsupport, movement and locomotiontransport in animalstropic responseuse and abuse of drugsvariation and selection	topic box
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Maybe you could help other users of this database by tagging a topic and a keyword.    Click here if you do not wish to help

Keyword:	KEYWORD - acid rain action of enzymes on glucose active & passive immunity active site and substrate active transport active transport and diffusion active transport diffusion osmosis adaptation addictive drugs adrenaline aerobic respiration aerobic respiration in plants affected by environment albinism alcohol alimentary canal allele alveolus amino acid breakdown amylase anabolic steroid anaemia anaerobic respiration anaerobic respiration in yeast animal and plant cells animal cell antibiotic immunity antibiotic resistance antibiotics antibodies arm movement arthropods artificial selection asexual and sexual reproduction asexual reproduction assimilation diffusion osmosis translocation assimilation, digestion, ingestion, peristalsis atmosphere auxins bacteria virus fungus bacterium balanced diet basic units of large food molecules bile binomial system biodiversity birth control birth rates blood blood cells blood clotting blood glucose blood groups blood vessels body mass index bones brain breast milk breathing breathing rate breathing system broken calcium capillaries and tissues capillaries arteries and veins capillary capillary walls carbon carbon and water cycle carbon concentration in atmosphere carbon cycle carbon dioxide carbon monoxide carbon nitrogen or water cycle catalysts causes of heart attack cell functions cell membrane cell processes cell specialism cell structure cell structure - leaf cell surface membranes cells and tissues central nervous system characteristics of amphibians characteristics of annelids & arthropods characteristics of arthropods characteristics of fish characteristics of insects characteristics of invertebrates characteristics of living organisms characteristics of mammals characteristics of plants characteristics of vertebrates cheese production chemical digestion chewing childbirth chloroplasts cholera chromosomes chromosomes and mitosis cilia ciliated cells circulatory system circulatory system in fish and mammal classification co-dominance colour blindness conservation constipation continuous and discontinuous variation contraception control spread of disease coronary heart disease cross-pollination cuttings cycles cystic fibrosis deamination of amino acid decomposition decomposition of oil by microbes deficiency deforestation development of organism diabetes diabetes mellitus dichotomous keys dicotyledonous plant diet dietary fibre diffusion diffusion osmosis transpiration translocation diffusion, osmosis, respiration digestion digestion -fats digestion -protein digestion in liver digestive enzymes digestive system diploid meiosis diploid nucleus discontinuous variation disease disease causing organisms DNA dominant allele dominant phenotype drug abuse dry mass of a plant duplicate ecosystem egestion endocrine glands energy energy flow through environment enzyme - definition enzyme - effect of pH enzyme - effect of temperature enzyme activity and temperature enzyme and substrate enzymes eutrophication evaporation of sweat evolution excretion excretion movement nutrition respiration exercise expiration extinction eye fat digestion feeding relationships fermentation fermenter fertilisation fertilisers flaccid flood prevention flow of energy in ecosystem flowering plants food chain food chain, food web, nutrient cycle, ecosystem food chains food chains webs ecosystems and cycles food chemical structure food groups food relationships food tests food webs frog skin fungus gall bladder gametes and chromosomes gas exchange genetic diseases genetic diversity genetic engineering genetically modified organisms genetics genotypes geotropism germination of seeds global warming glucose concentration in blood glycogen, protein & starch gravitropism green plants production of carbon dioxide greenhouse effect groups and kingdoms growth growth in arthropod growth in humans growth, nutrition, reproduction & respiration guard cell haemoglobin haemophilia haploid haploid nuclei heart heart rate herbicides and pesticides heroin heterozygous homozygous HIV homeostasis homozygous hormone hormone glands hormones hormones - testosterone human blood groups human gametes human influences on the environment hydration hydrophyte identification identify cell identify micoorganism identifying organs ileum immunity in vitro fertilisation ingestion inhaled and exhaled air insecticide insulin insulin production invertebrates iron deficiency joints KEYWORD kidney kidney dialysis kwashiorkor lactic acid and exercise lactose free milk leaf adaptation leaf cells leaf cells - water loss leaf functions leaf processes leaf structure leaf structure -cell organ system tissue leaf structure -photosynthesis level of organisation lipase liver liver and palisade cell liver cell liver functions lock and key lungs lymphatic system magnesium deficiency magnification malaria malnutrition mechanism of absorption meiosis meiosis and mitosis menstrual cycle mesophyll cell metabolism microbes minerals and vitamins mitochondria mitosis mitosis and meiosis monocotyledon motor and sensory neurones movement movement of gases in and out of cell mRNA MRSA muscle groups muscles and bones mutations natural birth control natural selection negative feedback negative geotropism nervous system neurone nicotine nitrates nitrates deficiency nitrogen cycle nucleus of gametes and zygotes nutrients from soil nutrition organ for breakdown of amino acids organs and systems osmosis osmosis -water potential osmosis and diffusion ovulation oxygen as a waste product oxygen concentration in water oxygen debt oxygen diffusion oxygen root hair cells palisade cell pancreas passive immunity pathogen penicillin percentage of offspring peristalsis permeable structures pesticides pesticides and food chains ph in mouth phenotype phloem phloem and xylem phloem cells photosynthesis photosynthesis & respiration phototropism & phototaxis placenta plant cell plant deficiency plant growth plant hormones plant nutrition plant reproduction plant respiration plant root plant root cell plant structure plasma and tissue fluid pollination pollination by insects pollution population population changes population pyramid pregnancy producers protease protein synthesis proteins pyramid of biomass pyramid of numbers pyramids rate of reaction rate of water uptake in a shoot recessive allele recycling red blood cells reduction division reflex - pupil reflex action reflex arc relay neurones removal of excretory products from blood renewable resources reproduction reproduction female reproduction in plants and animals reproduction stages in human reproductive system female reproductive system male respiration respiration of yeast respiratory system rickets root hair root hair cell roots as a source & sink roots stem & leaf saliva scurvy seed dispersal selective breeding self-pollination sensory neurone sewage sex chromosomes sex determination sex hormones sexual & asexual reproduction sexual reproduction sickle cell anaemia simple keys skin cells small intestine smoking smoking and cancer smoking and pregnancy species & genus sperm cell sprouting plants STD structure of plant cell substrate sulphur dioxide pollution sustainability sweating synapse synthesis of large molecules syphilis teeth temperature balance thorax tissue organ and systems trachea tranference of gene translocation transmissible disease transpiration transport transport in plants trophic level urea urea in blood and kidneys urinary system urine use of minerals vaccination valves in veins variation vasoconstriction vertebrate group villus virus vitamin c water and plants water balance water cycle water loss water potential white blood cells wind pollination adaptation xerophyte xylem yeast yeast respiration yoghurt production zygote	this is topic box
Topic:	TOPIC-biological moleculesbrokencell structurecharacteristics and classificationcoordination response and homeostasisdiseases and immunityduplicateenzymesexcretion in humanshuman influenceshuman reproductioninheritancemicroorganisms and biotechnologymovement into and out of cellsnutrition in animals & humansnutrition in animals & humansorganisms and their environmentplant nutrition and transportreproduction in plantsrespirationsexual and asexual reproductionsupport, movement and locomotiontransport in animalstropic responseuse and abuse of drugsvariation and selection	topic box
HINT: Tag keyword first and a found topic may be added automatically.

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C

D

show solution

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A

B

C

D

show solution

Build  

A

B

C

D

show solution

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Maybe you could help other users of this database by tagging a topic and a keyword.    Click here if you do not wish to help

Keyword:	KEYWORD - acid rain action of enzymes on glucose active & passive immunity active site and substrate active transport active transport and diffusion active transport diffusion osmosis adaptation addictive drugs adrenaline aerobic respiration aerobic respiration in plants affected by environment albinism alcohol alimentary canal allele alveolus amino acid breakdown amylase anabolic steroid anaemia anaerobic respiration anaerobic respiration in yeast animal and plant cells animal cell antibiotic immunity antibiotic resistance antibiotics antibodies arm movement arthropods artificial selection asexual and sexual reproduction asexual reproduction assimilation diffusion osmosis translocation assimilation, digestion, ingestion, peristalsis atmosphere auxins bacteria virus fungus bacterium balanced diet basic units of large food molecules bile binomial system biodiversity birth control birth rates blood blood cells blood clotting blood glucose blood groups blood vessels body mass index bones brain breast milk breathing breathing rate breathing system broken calcium capillaries and tissues capillaries arteries and veins capillary capillary walls carbon carbon and water cycle carbon concentration in atmosphere carbon cycle carbon dioxide carbon monoxide carbon nitrogen or water cycle catalysts causes of heart attack cell functions cell membrane cell processes cell specialism cell structure cell structure - leaf cell surface membranes cells and tissues central nervous system characteristics of amphibians characteristics of annelids & arthropods characteristics of arthropods characteristics of fish characteristics of insects characteristics of invertebrates characteristics of living organisms characteristics of mammals characteristics of plants characteristics of vertebrates cheese production chemical digestion chewing childbirth chloroplasts cholera chromosomes chromosomes and mitosis cilia ciliated cells circulatory system circulatory system in fish and mammal classification co-dominance colour blindness conservation constipation continuous and discontinuous variation contraception control spread of disease coronary heart disease cross-pollination cuttings cycles cystic fibrosis deamination of amino acid decomposition decomposition of oil by microbes deficiency deforestation development of organism diabetes diabetes mellitus dichotomous keys dicotyledonous plant diet dietary fibre diffusion diffusion osmosis transpiration translocation diffusion, osmosis, respiration digestion digestion -fats digestion -protein digestion in liver digestive enzymes digestive system diploid meiosis diploid nucleus discontinuous variation disease disease causing organisms DNA dominant allele dominant phenotype drug abuse dry mass of a plant duplicate ecosystem egestion endocrine glands energy energy flow through environment enzyme - definition enzyme - effect of pH enzyme - effect of temperature enzyme activity and temperature enzyme and substrate enzymes eutrophication evaporation of sweat evolution excretion excretion movement nutrition respiration exercise expiration extinction eye fat digestion feeding relationships fermentation fermenter fertilisation fertilisers flaccid flood prevention flow of energy in ecosystem flowering plants food chain food chain, food web, nutrient cycle, ecosystem food chains food chains webs ecosystems and cycles food chemical structure food groups food relationships food tests food webs frog skin fungus gall bladder gametes and chromosomes gas exchange genetic diseases genetic diversity genetic engineering genetically modified organisms genetics genotypes geotropism germination of seeds global warming glucose concentration in blood glycogen, protein & starch gravitropism green plants production of carbon dioxide greenhouse effect groups and kingdoms growth growth in arthropod growth in humans growth, nutrition, reproduction & respiration guard cell haemoglobin haemophilia haploid haploid nuclei heart heart rate herbicides and pesticides heroin heterozygous homozygous HIV homeostasis homozygous hormone hormone glands hormones hormones - testosterone human blood groups human gametes human influences on the environment hydration hydrophyte identification identify cell identify micoorganism identifying organs ileum immunity in vitro fertilisation ingestion inhaled and exhaled air insecticide insulin insulin production invertebrates iron deficiency joints KEYWORD kidney kidney dialysis kwashiorkor lactic acid and exercise lactose free milk leaf adaptation leaf cells leaf cells - water loss leaf functions leaf processes leaf structure leaf structure -cell organ system tissue leaf structure -photosynthesis level of organisation lipase liver liver and palisade cell liver cell liver functions lock and key lungs lymphatic system magnesium deficiency magnification malaria malnutrition mechanism of absorption meiosis meiosis and mitosis menstrual cycle mesophyll cell metabolism microbes minerals and vitamins mitochondria mitosis mitosis and meiosis monocotyledon motor and sensory neurones movement movement of gases in and out of cell mRNA MRSA muscle groups muscles and bones mutations natural birth control natural selection negative feedback negative geotropism nervous system neurone nicotine nitrates nitrates deficiency nitrogen cycle nucleus of gametes and zygotes nutrients from soil nutrition organ for breakdown of amino acids organs and systems osmosis osmosis -water potential osmosis and diffusion ovulation oxygen as a waste product oxygen concentration in water oxygen debt oxygen diffusion oxygen root hair cells palisade cell pancreas passive immunity pathogen penicillin percentage of offspring peristalsis permeable structures pesticides pesticides and food chains ph in mouth phenotype phloem phloem and xylem phloem cells photosynthesis photosynthesis & respiration phototropism & phototaxis placenta plant cell plant deficiency plant growth plant hormones plant nutrition plant reproduction plant respiration plant root plant root cell plant structure plasma and tissue fluid pollination pollination by insects pollution population population changes population pyramid pregnancy producers protease protein synthesis proteins pyramid of biomass pyramid of numbers pyramids rate of reaction rate of water uptake in a shoot recessive allele recycling red blood cells reduction division reflex - pupil reflex action reflex arc relay neurones removal of excretory products from blood renewable resources reproduction reproduction female reproduction in plants and animals reproduction stages in human reproductive system female reproductive system male respiration respiration of yeast respiratory system rickets root hair root hair cell roots as a source & sink roots stem & leaf saliva scurvy seed dispersal selective breeding self-pollination sensory neurone sewage sex chromosomes sex determination sex hormones sexual & asexual reproduction sexual reproduction sickle cell anaemia simple keys skin cells small intestine smoking smoking and cancer smoking and pregnancy species & genus sperm cell sprouting plants STD structure of plant cell substrate sulphur dioxide pollution sustainability sweating synapse synthesis of large molecules syphilis teeth temperature balance thorax tissue organ and systems trachea tranference of gene translocation transmissible disease transpiration transport transport in plants trophic level urea urea in blood and kidneys urinary system urine use of minerals vaccination valves in veins variation vasoconstriction vertebrate group villus virus vitamin c water and plants water balance water cycle water loss water potential white blood cells wind pollination adaptation xerophyte xylem yeast yeast respiration yoghurt production zygote	this is topic box
Topic:	TOPIC-biological moleculesbrokencell structurecharacteristics and classificationcoordination response and homeostasisdiseases and immunityduplicateenzymesexcretion in humanshuman influenceshuman reproductioninheritancemicroorganisms and biotechnologymovement into and out of cellsnutrition in animals & humansnutrition in animals & humansorganisms and their environmentplant nutrition and transportreproduction in plantsrespirationsexual and asexual reproductionsupport, movement and locomotiontransport in animalstropic responseuse and abuse of drugsvariation and selection	topic box
HINT: Tag keyword first and a found topic may be added automatically.

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