Biology B2 2

B2 2.1-2.4

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  • Created by: sarah
  • Created on: 26-11-11 19:41

Photosynthesis

Equation:

carbon dioxide + water + light energy = glucose + oxygen

Carbon dioxide taken in by leaves.

Water taken in by roots.

Chlorophyll traps the sun's energy needed for photosynthesis.

During photosynthesis the sugar glucose (carbohydrates) is made.

Oxygen is given off as waste gas.

Photosynthesis only carried out by green plants.

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Limiting Factors

If there is not enough carbon dioxide, heat or light then the rate of photosynthesis will slow down.

Plant growers need to know this or they will waste money.

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How plants use glucose

Glucose is used for respiration.

Its combines with other nutrients by the plant to produce new materials.

Glucose is stored as STARCH. It's insoluble so that it has no effect on osmosis.

Respiration is the release of energy from food.

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Why do plants need minerals?

Plant roots take up mineral salts for healthy growth.

Nitrates used for amino acids, make proteins for growth. Stunted growth if there is not enough nitrate.

Magnesium ions to make chlorophyll.

No chlorophyll means yellow leaves.

Plants produce sugars through photosynthesis.

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Comments

Harry

This has been very good for me to use thank you :D

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