Biology summaries Year 4 (mavo) · Clear summaries in English 9 · Plants9.1Leaves→9.2Stems and roots→9.3Glucose as a raw material→9.4Reproduction in plants→9.5Pollination, fertilisation and dispersal→9.6Germination, growth and development→10 · Coordination and control10.1The nervous system→10.2Neurons and nerves→10.3The spinal cord→10.4The brain→10.5Routes taken by nerve impulses→10.6The endocrine system→11 · Senses11.1The sensory system→11.2Ten human senses→11.3The eyes→11.4The iris and lens→11.5The retina→11.6The ears→12 · Nutrition and digestion12.1Enzymes→12.2Foods and nutrients→12.3Nutrition and lifestyle→12.4The digestive system→12.5Organs involved in digestion→12.6Herbivores, carnivores and omnivores→13 · Transport and immune defence13.1Blood→13.2Circulation and blood vessels→13.3The heart→13.4Cardiovascular disease→13.5Tissue fluid and lymph→13.6Immune defence→13.7Transplants and blood transfusions→14 · Gas exchange and excretion14.1A stable internal environment→14.2The skin and subcutaneous tissue→14.3The human respiratory system→14.4Breathing in and out→14.5Air quality and lung disease→14.6Gas exchange in animals→14.7The liver and kidneys→
