1
Q
what is diffusion?
A
the net movement of particles from an area of high concentration to an area of low concentration
2
Q
does diffusion require energy?
A
no, it is a passive process
3
Q
what states of matter does diffusion happen in?
A
liquids and gases because particles in these substances can move around randomly
4
Q
what makes diffusion rate faster?
A
a larger difference in concentration
5
Q
how do cell membranes control diffusion into and out of cells?
A
only small molecules can diffuse through, big molecules cant fit through the membrane
IGCSE Biology
flashcards
Decks in class (76)
# Cards
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Topic 1 - Characteristics Of Living Organisms10
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Topic 1 - Levels Of Organisation18
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Topic 1 - Stem Cells (Paper 2)8
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Topic 1 - Plants, Animals, Fungi, Protoctists, Bacteria, and Viruses34
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Topic 1 - Enzymes9
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Topic 1 - Diffusion5
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Topic 1 - Osmosis5
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Topic 1 - Diffusion and Osmosis Practicals3
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Topic 1 - Active Transport7
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Topic 2 - Biological Molecules6
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Topic 2 - Food Tests12
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Topic 2 - A Balanced Diet25
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Topic 2 - Energy From Food (Paper 2)5
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Topic 2 - Enzymes and Digestion11
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Topic 2 - The Alimentary Canal13
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Topic 3 - Photosynthesis12
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Topic 3 - Rate Of Photosynthesis6
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Topic 3 - Photosynthesis Experiments8
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Topic 3 - Minerals For Growth11
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Topic 3 - Transport In Plants5
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Topic 3 - Transport In Plants (Paper 2)2
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Topic 3 - Transpiration (Paper 2)8
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Topic 4 - Respiration11
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Topic 4 - Investigating Respiration3
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Topic 4 - The Respiratory System9
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Topic 4 - Investigating Breathing2
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Topic 4 - Human Gas Exchange11
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Topic 5 - Functions of Blood5
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Topic 5 - Functions of Blood (Paper 2)3
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Topic 5 - White Blood Cells5
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Topic 5 - White Blood Cells (Paper 2)1
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Topic 5 - Blood Vessels18
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Topic 5 - The Heart13
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Topic 5 - Circulation18
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Topic 5 - The Kidneys (Paper 2)10
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Topic 6 - The Nervous System13
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Topic 6 - Reflexes2
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Topic 6 - The Eye16
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Topic 6 - Hormones18
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Topic 6 - Hormones (Paper 2)9
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Topic 6 - Homeostasis9
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Topic 6 - Plant Responses7
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Topic 7 - DNA, Genes and Chromosomes10
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Topic 7 - DNA, Genes and Chromosomes (Paper 2)3
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Topic 7 - Protien Synthesis (Paper 2)11
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Topic 7 - Asexual Reproduction and Mitosis3
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Topic 7 - Sexual Reproduction and Meiosis10
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Topic 7 - Sexual Reproduction in Plants12
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Topic 7 - Fertilisation and Germination in Plants4
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Topic 7 - Investigating Germination1
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Topic 7 - Asexual Reproduction in Plants3
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Topic 7 - Human Reproductive Systems19
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Topic 7 - Variation4
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Topic 7 - The Menstrual Cycle and Pregnancy8
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Topic 7 - The Menstrual Cycle and Pregnancy (Paper 2)6
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Topic 7 - Evolution2
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Topic 7 - Mutations2
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Topic 7 - Mutations (Paper 2)4
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Topic 8 - Ecosystems and Biodiversity6
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Topic 8 - Ecosystems and Biodiversity (Paper 2)3
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Topic 8 - Using Quadrats2
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Topic 8 - Pyramids of Number, Biomass and Energy8
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Topic 8 - Energy Transfer and Food Webs5
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Topic 8 - The Carbon Cycle6
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Topic 8 - The Nitrogen Cycle (Paper 2)10
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Topic 8 - Air Pollution6
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Topic 8 - The Greenhouse Effect9
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Topic 8 - Water Pollution and Deforestation3
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Topic 8 - Water Pollution and Deforestation (Paper 2)4
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Topic 9 - Increasing Crop Yield9
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Topic 9 - Bacteria and Making Yogurt8
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Topic 9 - Yeast and Making Bread2
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Topic 9 - Selective Breeding6
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Topic 9 - Fish Farming (Paper 2)5
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Topic 9 - Genetic Engineering13
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Topic 9 - Cloning (Paper 2)3
