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In succulent plants, the stomata open in...

In succulent plants, the stomata open in the night and close in the day . which among the following would be the best hypothesis to explain the Mechanism of stomatal in the night only?

A

`CO_2` accumulates, reduces pH, stimulate enzymes resulting in accumulation of sugars.

B

Increases in `CO_2` concentration , conversion of organic acids into starch resulting in the increased conversation into sugars resulting in `K^+` transport

C

Low `CO_2` concentration accumulates organic acids resulting in the increased conversion into sugars resulting in `K^+` transport.

D

`CO_2` used up , increase pH results in accumulation of sugars.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question about the mechanism of stomatal behavior in succulent plants, we need to understand the physiological processes that occur during the night when these plants open their stomata. ### Step-by-Step Solution: 1. **Understanding Succulent Plants**: - Succulent plants, such as cacti, have adapted to store water in their leaves and stems. This adaptation allows them to survive in arid environments. 2. **Stomatal Behavior**: - In succulent plants, stomata open at night and close during the day. This is contrary to most plants, which typically open their stomata during the day for photosynthesis. 3. **Nighttime Processes**: - During the night, there is incomplete oxidation of carbohydrates. This means that the carbohydrates produced during the day are not fully broken down. 4. **Accumulation of Organic Acids**: - As a result of this incomplete oxidation, organic acids accumulate in the plant cells. The primary organic acid that accumulates is malic acid. 5. **Role of CO2**: - The accumulation of organic acids leads to a situation where carbon dioxide (CO2) does not get released. Instead, CO2 accumulates in the guard cells of the stomata. 6. **Effect on Guard Cells**: - The accumulation of CO2 in the guard cells leads to a decrease in pH (acidification). This acidification stimulates enzymes that result in the accumulation of sugars. 7. **Turgor Pressure**: - The increase in sugars and organic acids in the guard cells increases their turgor pressure, causing the stomata to open. 8. **Conclusion**: - Therefore, the best hypothesis to explain the mechanism of stomatal opening at night in succulent plants is that CO2 accumulates, reduces pH, stimulates enzymes, and results in the accumulation of sugars. ### Final Answer: The best hypothesis is: **CO2 accumulates, reduces pH, stimulates enzymes resulting in the accumulation of sugars.** ---
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