Food Chains and Food Webs

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Presentation transcript:

Food Chains and Food Webs

Producer Consumer Herbivore Carnivore Omnivore Predator Prey Habitat Food Chain Food Web

Design questions where each of the preceding key words is the answer Design questions where each of the preceding key words is the answer. You have 7 minutes. Then swap with someone on our lab bench.

Food Chain / Food Web Revision What do the arrows represent in a food chain? Flow of energy (food chains are sometimes called energy-transfer chains) What is the difference between a food chain and a food web? Food chains show what eats what in a community; food webs show food chains for an entire ecosystem Label the following food chain using all of your fancy vocabulary: grass → gazelle → cheetah 4

5

Copy the following food chains into your books and then answer the questions on the next slide Hawk Fox Owl Human Chicken Mouse Chicken Wheat Wheat Berries

Combine the three food chains to form a food web Name two producers and two herbivores Name a secondary consumer List two predator-prey relationships Explain how a fox is a well-adapted carnivore Imagine that a disease has killed off some of the mice. What affect would this have on: the owls? the chickens?

Copy the following food web and answer the questions on the next slide sea bird starfish crab dog whelk barnacle limpet mussel small algae SEA SHORE FOOD WEB

How many primary consumers are there? How many secondary consumers are there? Draw a food chain with 5 links from the food web Suppose all the starfish died from pollution. Explain what would happen to the number of: mussels? small algae? A fishing village nearby captures most of the crabs from the food web. Explain what affect this would have on the numbers of barnacles.

Biology for You Page 323 Questions 1, 2, 3

Homework Complete the worksheet for next lesson (Thursday)

Pyramids of Numbers Food chains and food webs can show the feeding relationships in a community. But they do NOT tell us how many living organisms are involved. Scientists often represent the numbers in a food chain using a pyramid of numbers

oak leaves (600) caterpillars (100) shrews (10) owl (1) The area of each box in a pyramid of numbers shows how many living things there are at each stage of a food chain. Always start with the producer at the bottom of your pyramid Draw a pyramid of numbers for this food chain

owl shrews caterpillars oak leaves But be careful...pyramids of numbers do NOT always have this ‘pyramid’ shape...

oak tree caterpillars blackbirds buzzard Draw a pyramid of numbers for this food chain buzzard blackbirds caterpillars oak tree

rose bush greenfly ladybirds parasites Draw a pyramid of numbers for this food chain parasites ladybirds greenfly rose bush

Quick Recap

Complete the GCSE Worksheet