Sunday, October 16, 2011

Photosynthesis Review Questions

1) After Thanksgiving break you return to the HTHMA garden to find that your crops have not been watered in over two weeks. Most of your plants are dead and those that are alive are barely hanging on. In relation to the process of photosynthesis, describe what has happened to your plants.
The plant will eventually run out of H2O therefore it will not be able to produce ATP, NADPH, nor glucose, which are the plant's main components for growth. The plants who are "barely hanging on" either stored glucose, or were able to retain more water keeping them alive much longer.

2) Upon microscopic inspection of the underside of your plant’s leaves, you notice that in an attempt to conserve water the stomata (aka stomates) are closed. Explain in detail how this impacts the light independent reactions of photosynthesis.
CO2 used during photosynthesis first must pass through stomata into internal spaces within the leaf. It then diffuses into mesophyll cells where it becomes available for photosynthesis.When the stomata close, CO2 levels drop rapidly within the leaf, inhibiting the light-independent reactions. This then causes photosynthesis to stop.

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