Assertion : Light plays an important role in process of transpiration.
Reason : Light leads to opening of stomata and in dark stomata get closed.

Options

A. If both Assertion and Reason are true and Reason is correct explanation of Assertions.
B. If both Assertion and Reason are true but Reason is not correct explanation of Assertion.
C. If Assertion is true but Reason is false.
D. If both Assertion and Reason are false.

Answer

**Step-by-Step Solution:**

1. **Understanding the Assertion**: The assertion states that "Light plays an important role in the process of transpiration." To analyze this, we need to understand what transpiration is. Transpiration is the process by which plants lose water, primarily through small openings called stomata.

2. **Role of Stomata**: The stomata are crucial for transpiration as they allow water vapor to escape from the plant. The opening and closing of stomata are controlled by guard cells, which respond to various environmental factors, including light.

3. **Effect of Light on Stomata**: The reason states that "Light leads to the opening of stomata and in dark stomata get closed." This is true because, in the presence of light, photosynthesis occurs, resulting in the production of sugars. The increase in sugar concentration in guard cells causes them to take up water, becoming turgid, which leads to the opening of the stomatal pores.

4. **Effect of Darkness on Stomata**: Conversely, in the absence of light (darkness), the process of photosynthesis does not occur. The sugars in guard cells are converted to starch, leading to a decrease in solute concentration. Water exits the guard cells, making them flaccid, and thus the stomata close.

5. **Conclusion**: Since light causes the stomata to open, facilitating transpiration, and darkness causes them to close, it is clear that light plays a significant role in the process of transpiration. Therefore, both the assertion and reason are correct, and the reason accurately explains the assertion.

**Final Answer**: Both the assertion and reason are correct, and the reason correctly explains the assertion.

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