Unit 2 - Photosynthesis

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  • Created on: 11-01-13 08:02
Preview of Unit 2  - Photosynthesis

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Carbon dioxide + water (+light energy) = glucose + oxygen
During photosynthesis:
1. Light energy is absorbed by a green substance called
chlorophyll which is found in chloroplasts in some plant cells.
2. This energy is used by converting carbon dioxide and water
into sugar (glucose).
3. Oxygen is released as a by-product
The rate of photosynthesis may be limited by:
1. Low temperature
2. Shortage of carbon dioxide
3. Shortage of light
Light, temperature and the availability of carbon dioxide
interact and in practise any one of them may be the factor
that limits photosynthesis
The glucose produced in photosynthesis may be converted
into insoluble starch for starch storage. Plant cells use some of
the glucose produced during photosynthesis for respiration.
Plant roots absorb mineral salts including nitrates needed for
healthy growth. For healthy growth plants need mineral ions
1. Nitrate ­ for producing amino acids which are then used to
form proteins
2. Magnesium ­ which is needed for chlorophyll production
The symptoms shown by plants growing in conditions where
mineral ions are deficient include:
1. Stunted growth if nitrate ions are deficient
2. Yellow leaves if magnesium ions are deficient


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