Bio Notes Essay

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AQA GCSE Science BIOLOGY 2 Unit B2.3 Photosynthesis

Know that all green plants and algae use light energy to make their own food.

Know that all green plants and algae obtain the raw materials they need to make this food from the air and the soil.

Know that the conditions in which plants are grown can be changed to promote growth.

You should be able to use your skills, knowledge and understanding to be able to:

interpret data showing how factors affect the rate of photosynthesis

evaluate the benefits of artificially manipulating the environment in which plants are grown.

Photosynthesis - factors affecting the rate - light temperature & carbon dioxide concentration

AQA GCSE Science BIOLOGY Unit B2.3.1 Photosynthesis

a) Know that photosynthesis is summarised by the equation:

carbon dioxide + water == light energy/chlorophyll ==> glucose + oxygen

b) Know that during photosynthesis:

Light energy is absorbed by a green substance called chlorophyll, which is found in chloroplasts in some plant cells and algae,

This energy is used by converting carbon dioxide (from the air) and water (from the soil) into sugars (e.g. glucose),

Oxygen is released as a by-product.

Photosynthesis takes place in the leaves of all green plants and is the main function of leaves.

c) Know that the rate of photosynthesis may be limited by:

(i) shortage of light (usually sunlight) slows photosynthesis

(ii) low temperature, slows down the rate of photosynthesis

(iii) shortage of carbon dioxide will also slow down the rate of photosynthesis,

d) Know that light, temperature and the availability of carbon dioxide interact and in practice any one of them may be the factor that limits photosynthesis.

e) Know that the glucose produced in photosynthesis may be