Learn

IGCSE Biology

Choose a lesson to begin.

1 Characteristics and classification of living organisms 0 / 3

1.1 Characteristics of living organisms 1.2 Concept and uses of classification systems 1.3 Features of organisms

2 Organisation of the organism 0 / 3

2.1.1 Cells 2.1.2 Specialised cells and organisation 2.2 Size of specimens

3 Movement into and out of cells 0 / 3

3.1 Diffusion 3.2 Osmosis 3.3 Active transport

4 Biological molecules 0 / 2

4.1.1 Biological molecules 4.1.2 Food tests

5 Enzymes 0 / 2

5.1.1 What enzymes are 5.1.2 Temperature and pH

6 Plant nutrition 0 / 2

6.1 Photosynthesis 6.2 Leaf structure

7 Human nutrition 0 / 5

7.1 Diet 7.2 Digestive system 7.3 Physical digestion 7.4 Chemical digestion 7.5 Absorption

8 Transport in plants 0 / 4

8.1 Xylem and phloem 8.2 Water uptake 8.3 Transpiration 8.4 Translocation

9 Transport in animals 0 / 4

9.1 Circulatory systems 9.2 Heart 9.3 Blood vessels 9.4 Blood

10 Diseases and immunity 0 / 2

10.1.1 Pathogens and defences 10.1.2 Immunity and vaccination

11 Gas exchange in humans 0 / 2

11.1.1 Gas exchange surfaces 11.1.2 Breathing and gas exchange

12 Respiration 0 / 3

12.1 Respiration 12.2 Aerobic respiration 12.3 Anaerobic respiration

13 Excretion in humans 0 / 2

13.1.1 Excretion and the urinary system 13.1.2 The nephron and urea

14 Coordination and response 0 / 8

14.1.1 The nervous system and reflexes 14.1.2 Synapses 14.2.1 The eye 14.2.2 Accommodation, rods and cones 14.3 Hormones 14.4.1 Homeostasis and blood glucose 14.4.2 Controlling body temperature 14.5 Tropic responses

15 Drugs 0 / 1

15.1 Drugs

16 Reproduction 0 / 8

16.1 Asexual reproduction 16.2 Sexual reproduction 16.3.1 Flowers and pollination 16.3.2 Fertilisation and germination 16.4.1 Human reproductive systems 16.4.2 Gametes, fertilisation and pregnancy 16.5 Sex hormones in humans 16.6 Sexually transmitted infections

17 Inheritance 0 / 7

17.1.1 Chromosomes, genes and proteins 17.1.2 How DNA makes proteins 17.2 Mitosis 17.3 Meiosis 17.4.1 Inheritance key words 17.4.2 Monohybrid crosses 17.4.3 Codominance and sex linkage

18 Variation and selection 0 / 4

18.1 Variation 18.2 Adaptive features 18.3.1 Natural selection 18.3.2 Selective breeding

19 Organisms and their environment 0 / 6

19.1 Energy flow 19.2.1 Food chains and food webs 19.2.2 Trophic levels and energy loss 19.3.1 The carbon cycle 19.3.2 The nitrogen cycle 19.4 Populations

20 Human influences on ecosystems 0 / 5

20.1 Food supply 20.2 Habitat destruction 20.3.1 Water pollution and eutrophication 20.3.2 Plastics and greenhouse gases 20.4 Conservation

21 Biotechnology and genetic modification 0 / 4

21.1 Biotechnology and genetic modification 21.2.1 Biotechnology in action 21.2.2 Fermenters 21.3 Genetic modification