Assertion : Dark acidification of cytoplasm occurs in CAM plants.
Reaon : Orgnaic acids are decarboxylated during night.

Options

A. If both Assertion % Reson ar true and the reason is the correct explanation of the asserition the mark (1)
B. If both Assertion % Reason are true but the reason, is not the correct explanation of the assertion ,then mark (2)
C. If Assetion is true statement but Reason is false , The mark (3)
D. If both Assertion and Reason are false statements, the mark (4)

Answer

### Step-by-Step Text Solution:

1. **Understanding CAM Plants**:
- CAM (Crassulacean Acid Metabolism) plants are a type of plant that adapts to arid conditions by opening their stomata at night instead of during the day. This adaptation helps to minimize water loss.

2. **Assertion Analysis**:
- The assertion states that "Dark acidification of cytoplasm occurs in CAM plants." This is true. During the night, when the stomata are open, CAM plants take in carbon dioxide (CO2) and convert it into organic acids, leading to acidification in the cytoplasm.

3. **Reason Analysis**:
- The reason given is that "Organic acids are decarboxylated during the night." This statement is misleading. While organic acids are indeed produced at night, they are not decarboxylated until the daytime when the stomata are closed, and the plant uses the stored CO2 for photosynthesis.

4. **Conclusion**:
- The assertion is correct, but the reason is incorrect. Therefore, the assertion stands true while the reason does not support the assertion.

5. **Final Answer**:
- The correct answer is that the assertion is true, but the reason is false.