ORGANISMS IN A FOOD CHAIN YEAR 7 SCIENCE

ORGANISMS IN A FOOD CHAIN YEAR 7 SCIENCE

ECOSYSTEMS MIND MAP CHECK IN HOW DID YOU GO? ? ?

FOOD CHAINS – WHAT EATS WHAT? What is the food chain in this habitat?

FOOD CHAINS A food chain shows what is eaten by what. Each arrow means ‘eaten by’. leaf caterpillar bird cat What does this food chain show? A leaf is eaten by a caterpillar, which is eaten by a bird, which is eaten by a cat. Energy is transferred from one organism to another in the direction of the arrow.

NAME THAT FEEDING TYPE

RANKING CONSUMERS Consumers eat plants or animals, or both. A food chain can be used to rank different types of consumers. seaweed limpet producer primary consumer or first-order consumer secondary consumer or second-order consumer tertiary consumer or third-order consumer Also: a herbivore & a heterotroph Also: an omnivore or a carnivore & a heterotroph Also: an autotroph crab human

PRIMARY, SECONDARY OR TERTIARY?

WHAT IS A FOOD WEB? • Why is it a good idea for an organism to have different sources of food? Animals usually eat many different things and are involved in lots of different food chains. • These food chains can be put together in a food web, which shows how the food chains are connected.

FOOD WEBS What would the food chains for this food web look like? warbler owl weasel bluetit moth spider mouse ladybird aphid plant

USING A FOOD WEB 1. Name the producer in this food web. 2. Name two herbivores in this food web. 3. Name two species that are top carnivores. 4. How many secondary consumers are there? 5. Which food chains include the moth?

FOOD FOR ENERGY • Most animals get their energy from food. • If the producers at the bottom of the food chain are small organisms, then the consumers at the top of chain need to eat lots of them to gain enough energy. • Much of the energy that prey generate is lost on a daily basis through heat, growth and waste. • Very little energy is actually transferred to the predator. Only about 10%!

NOW WHAT? • S. B. Module 5. 2 Review Qs – Q 3 -5, 8 -9, 13 -14, 17 -18 • A. B. 5. 6 and 5. 7 – Food Chains and Food Webs