Science Revision

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  • Created by: kcjzag02
  • Created on: 23-04-15 22:02

Explain the process of photosynthesis

During Photosynthesis plants make starch from carbon dioxide and water. They get carbon dioxide from the air and water from the soil. The plant uses energy in sunlight to join these chemicals together.

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What is chlorophyll?

In order to trap sunlight energy, plants contain a green pigment called chlorophyll which is found in the choroplasts in a plant cell.

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What is the equation for Photosynthesis?

Carbon Dioxide        Sunlight            Starch

           +                 _________ =          +

       Water             Chlorophyll.        Oxygen

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Why can't the tubers make starch?

They do not contain chlorophyll and they are underground so there is no light.

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What waste product is given off a plant?

Oxygen.

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How does starch get to the tuber?

The leaves make starch for the whole plant. The food is transported to any part of the plant that cannot photosynthesise.

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What are the seven main nutrients?

Carbohydrates

Protein

Minerals

Vitamins

Fibre

Fat

Water

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How do you test for starch?

To test for starch, you use iodine. Iodine is an orange liquid. If you add it to starh it turns blue/black.

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