Phenyl Mercuric Acetate (PMA) is a

Options

A. Anti-transpirant
B. Increased transpirant
C. Increased ascent of sap
D. None of these

Answer

**Step-by-Step Solution:**

1. **Understanding Phenyl Mercuric Acetate (PMA)**: PMA is a chemical compound that has specific effects on plant physiology, particularly in relation to transpiration.

2. **Role of PMA in Plants**: PMA is known to reduce the rate of transpiration in plants. Transpiration is the process by which water vapor is lost from the plant to the atmosphere, primarily through small openings called stomata.

3. **Mechanism of Action**: PMA functions as an antitranspirant. It induces the closing of stomata, which are the pores on the leaf surface that allow for gas exchange and water loss.

4. **Effects of Stomatal Closure**: By closing the stomata, PMA effectively reduces the amount of water vapor that can escape from the plant. This leads to a decrease in the overall rate of transpiration.

5. **Conclusion**: Therefore, Phenyl Mercuric Acetate (PMA) is a compound that acts as an antitranspirant by closing the stomata and reducing the rate of transpiration in plants.

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