Describe Crasslacean acid metabolism.

CAM :

It can be described in following ways :

1. Crasslacean acid metabolism (CAM) refers to a mechanism of photosynthesis that is different than already discussed C3 and C4 pathways.

2. This occurs only in succulents and other plants that normally grow in dry conditions.

3. In CAM plants C02 taken up by leaves or green stems through stomata, which remain open at night.

4. However during the day the stomata remain closed in these plants to conserve moisture.

5. The CO2 taken up in the night is fixed in the same way as in C4 plants to form malic acid, which is stored in the vacuole.

6. The malic acid thus formed during the night is used during the day as a source of CO2 for photosynthesis to proceed via the C3 pathway.

Significance : Thus CAM is a kind of adaptation that allows certain plants (for example, pineapple) to carry out photosynthesis without much loss of water.

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Which colour of light is most effective in photosynthesis for green plants ?

 Red and blue light.
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Where CO2 assimilation occurs in CPlants ?


In bundle sheath cells.
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Name the first stable compound formed in C3 cycle.

3-phosphoglyceric acid (PGA)
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 Describe Priestley’s experiment.

Priestley experiment.
In the experiment
A burning candle and a mouse were kept in a bell jar. It was observed that the candle was extiguished after sometime and the mouse soon died.
When a mint plant was kept in the same bell jar, it was found that the mouse stayed alive and the candle countinued to burn. Priestley hypothesised that plants restore to the air whatever breathing animals and burning candle  used up.  Priestley’s experiment.

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