Revision - topic 1 test

Structure of a leaf

Land plants have small pores on the under side of their leaves called stomata. When a plant needs carbon dioxide the stomata will open. Guard cells control the openign of the stomata.

1) Stomata opens when the guard cells open

2) If it is hotter, there are less stomata.

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Products in photosynthesis

What is produced?

Photosynthesis is a reaction

Carbon dioxide + water - sunlight - glucose + oxygen

Leaves are green because they contain a pigment called chlorophyll that absorbs light energy. Chlorophyll is found in the chloroplasts in plant cells.

Carbon dioxide and water - reactants

Sunlight - needed to make it happen

Glucose - product

Oxygen - byproduct

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Why are plants important?

1) Eating, drinking, breathing, medicine, building, fabrics, fuel, decoration, heat, oxygen.

2) Without plants, nothing could breathe as they remove the carbon dioxide from the air.

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Water loss in plants

When the guard cells are full of water and the stomata open, then water evaporates out of the pores.

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Food chains/webs

The food chain starts with a producer and ends with a consumer.

If the fox is eating the rabbit and the vole, what happens to the population of voles if the population of foxes goes up - the population of voles go down because there are more foxes to eat them.

Predator - the animal that eats the other animal

Prey - the animal that gets eaten

What is the difference between a food chain and a food web?

Food web is more than one food chain put into a web.

What do the arrows mean in a food chain?

The transfer of energy.

How can you show amounts in a food chain?

By using a pyramid of numbers.

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Predator/ prey relationship

If the fox is eating the rabbit and the vole, what happens to the population of voles if the population of foxes goes up - the population of voles go down because there are more foxes to eat them.

Predator - the animal that eats the other animal

Prey - the animal that gets eaten

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