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food chain

science
by

Vivian Georgy

on 11 October 2012

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Transcript of food chain

Food Chain Year 7 A food chain is a chain that shows the different organisms and who eats what. A food chain always starts with a producer ( green plant) and ends with consumer(animal or human). what is food chain? What is a producer?
A producer is an organism that can make their own food.
Why a producer is always a green plant? Because plants can make their own food by photosynthesis.
Photosynthesis:
Is the process where the plants use water, energy from sun and carbon dioxide from air to make sugar (food) and oxygen.
What are consumers?
Consumers eat either human or other animals or both.
Consumers are organisms (human/ animals) that depend on other organisms for their food.

Notice: The first consumer in the chain is also called the first - order consumer (primary consumer), the next one is the second - order consumer (secondary consumer) and the one after that is the third - order consumer (tertiary consumer). What are decomposers?
Decomposers are living things that can break down the dead bodies of the animals and plants.

Decomposers are natural recyclers:
Flies, Maggots, Worms, Bacteria and Fungi. Get students in groups to play the online game http://www.sheppardsoftware.com/content/animals/kidscorner/games/producersconsumersgame.htm http://www.sheppardsoftware.com/content/animals/kidscorner/games/foodchaingame.htm Take care:

The arrow points to the organism that is doing the eating.

If you get the arrows the wrong way round, instead of showing that snakes eat grasshoppers, you are showing that grasshoppers eat snakes. Types of consumers A herbivore: is a consumer that eats plants.


A carnivore: is a consumer that eats other animals.


An omnivore: is an animal that eats both plants and animals. Then play this game:
http://www.sheppardsoftware.com/content/animals/kidscorner/games/animaldietgame.htm. What is prey?

What is predator?

What is habitat? The prey: is the animal that gets eaten by the predator.

A predator: is an animal that eats other animals.

A habitat: is the place where an animal or plant lives.

Grass is eaten by Grasshopper is eaten by Frog is eaten by Owl.

in this example which is prey and which is predator? Give students 10 minutes to do it then share the answers with the rest of the class.

The right answers is :
The frog is a predator and the grasshopper is its prey.
The Owl is a predator and the frog is its prey. Food Web Food Web: it is just several food chains joined together.



it is an ecosystem which is made up of a great number of food chains. This leads to some interesting effects:
if the population of a particular organism in the food web decreases, some animals can just eat more of another organism, while others may starve and die.


This in turn can affect the populations of other organisms in the food web. similar to spider web no start and no end .
students will create a food web poster each for different ecosystems.


students in pairs will hand in a research essay on "The impact of human on the animal habitat. http://glencoe.mcgraw-hill.com/sites/dl/free/0078600472/164155/00053412.html
Full transcript