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Food webs


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Food webs

  2. 2. INTRODUCTION TO FOOD CHAINS • All living things need food for survival. • A food chain shows how plants, animals and humans rely on each other for food.
  3. 3. ANIMALS AND PLANTS ARE LINKED BY FOOD CHAINS Animals get energy and nutrients by eating other animals or plants. For example • caterpillars eat leaves • mice eat caterpillars • owls eat mice
  4. 4. LINKS BETWEEN FOOD CHAINS These links between animals and plants are called food chains. The arrow means 'is eaten by'. Nearly all food chains start with a green plant. Most animals and plants are part of more than one food chain.
  5. 5. HOW AN ANIMALS EXTINCTION AFFECT OTHER IN THE FOOD CHAIN If one part of a food chain alters, the whole food chain is affected. For example, if a disease suddenly wiped out caterpillars, it would affect mice, owls and many other animals.
  6. 6. CONSUMERS Animals are called consumers because they eat other plants and animals.
  7. 7. PRODUCERS Plants are called producers because they make their own food. They are at the start of a food chain. Plants get their energy from the Sun.
  8. 8. PREY AND PREDATORS A predator is an animal that eats other animals. The animals that predators eat are called prey. Predators are found at the end of a food chain.