Primary & Middle School Biology

Grade 1 (Age 6–7)

1. 1 Living or Not Living? 10 solved exercises
2. 2 Animals Around Us 10 solved exercises
3. 3 Plants Around Us 10 solved exercises
4. 4 My Body 10 solved exercises
5. 5 The Five Senses 10 solved exercises
6. 6 Healthy Habits 10 solved exercises

Grade 2 (Age 7–8)

1. 7 Born, Growing, Dying 10 solved exercises
2. 8 How Animals Grow Up 10 solved exercises
3. 9 From Seed to Plant 10 solved exercises
4. 10 What Animals Eat 10 solved exercises
5. 11 Where Animals Live 10 solved exercises
6. 12 Teeth and Eating Well 10 solved exercises
7. 13 Caring for Nature 10 solved exercises

Grade 3 (Age 8–9)

1. 14 Sorting Living Things 10 solved exercises
2. 15 The Stages of Life 10 solved exercises
3. 16 Flowers, Fruits and Seeds 10 solved exercises
4. 17 Bones and Muscles 10 solved exercises
5. 18 A Balanced Diet 10 solved exercises
6. 19 Food Chains 10 solved exercises
7. 20 Animals Through the Seasons 10 solved exercises

Grade 4 (Age 9–10)

1. 21 Classifying Animals 11 solved exercises
2. 22 What Plants Need 11 solved exercises
3. 23 How Animals Reproduce 11 solved exercises
4. 24 Plants Without Seeds 11 solved exercises
5. 25 The Journey of Food 11 solved exercises
6. 26 Breathing 11 solved exercises
7. 27 The Heart and the Blood 11 solved exercises
8. 28 Adapted to Their World 11 solved exercises

Grade 5 (Age 10–11)

1. 29 A First Look at Cells 11 solved exercises
2. 30 Biodiversity 11 solved exercises
3. 31 From Flower to Fruit 11 solved exercises
4. 32 Human Reproduction 11 solved exercises
5. 33 The Brain in Command 11 solved exercises
6. 34 Food Webs 11 solved exercises
7. 35 People and Nature 11 solved exercises
8. 36 Healthy Choices 11 solved exercises

Grade 6 (Age 11–12)

1. 37 Exploring Our Environment 12 solved exercises
2. 38 Life Through the Seasons 12 solved exercises
3. 39 How Plants Spread 12 solved exercises
4. 40 Plants Are Producers 12 solved exercises
5. 41 Matter From Food 12 solved exercises
6. 42 Decomposers and the Soil 12 solved exercises
7. 43 Producing Our Food 12 solved exercises
8. 44 Classification and Kinship 12 solved exercises
9. 45 The Cell, Unit of Life 12 solved exercises

Grade 7 (Age 12–13)

1. 46 What Is Respiration? 12 solved exercises
2. 47 How Animals Breathe 12 solved exercises
3. 48 Oxygen in the Water 12 solved exercises
4. 49 Organs at Work 12 solved exercises
5. 50 Digestion and Nutrients 12 solved exercises
6. 51 The Lungs and Gas Exchange 12 solved exercises
7. 52 The Heart and Circulation 12 solved exercises
8. 53 Removing the Wastes 12 solved exercises

Grade 8 (Age 13–14)

1. 54 Sexual Reproduction 12 solved exercises
2. 55 Reproduction and the Environment 12 solved exercises
3. 56 Puberty 12 solved exercises
4. 57 The Reproductive Systems 12 solved exercises
5. 58 From Egg Cell to Birth 12 solved exercises
6. 59 Contraception 12 solved exercises
7. 60 Nervous Communication 12 solved exercises
8. 61 Hormonal Communication 12 solved exercises
9. 62 Protecting the Nervous System 12 solved exercises

Grade 9 (Age 14–15)

1. 63 Heredity and Traits 12 solved exercises
2. 64 Chromosomes 12 solved exercises
3. 65 Genes and DNA 12 solved exercises
4. 66 Unique Individuals 12 solved exercises
5. 67 Evidence of Evolution 12 solved exercises
6. 68 How Species Change 12 solved exercises
7. 69 Microbes and Infection 12 solved exercises
8. 70 The Immune Defenses 12 solved exercises
9. 71 Our Responsibility 12 solved exercises

71 chapters — 71 online so far, and more publishing regularly. The complete book is already available as a free PDF you can read online.