I know stomata opens at day to collect CO2 at daytime. But what if it's guard cells becomes swelled due to water at night then it opens at night?

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Solution

Dear student

When guard cell absorbs water, they swell and become turgid. In general, stomata open by day and close at night. During the day, photosynthesis requires that the leaf mesophyll be exposed to the air to get CO₂. At night, the stomata close to avoid losing water when photosynthesis is not occurring.

In CAM plants stomata opens during night in order to reduce water loss. it is commonly seen in desert plants like cactus. These plants have special type of photosynthesis known as Crassulacean Acid Metabolism(CAM) because of the storage of carbon dioxide at night as malic acid.

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Which of the following statement is correct :
1. At night, these guard cells swell with water and become bloated, opening the stoma.
2. During the day, the guard cells release their water and the stomata close.
3. More than 97% percent of water reaching the leaves is used in plant growth and photosynthesis.
4. The rate of transpiration can be easily demonstrated by cobalt chloride paper test.

Stoma opens when -

1)guard cell swell due to an increase in their water potential

2)guard cell swell by endosmosis due to influx of proton

3)guard cell swell by endosmosis due to efflux of potassium ion

4)guard cells swell due to a decrease in their water potential

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