CAM pathway operates in
(a) Drought-escaping xerophytes
(b) Drought-resisting xerophytes
(c) Drought-enduring xerophytes
(d) Drought-enduring xerophytes

Options

A. Drought-escaping xerophytes
B. Drought-resisting xerophytes
C. Drought-enduring xerophytes
D. Drowght-enduring xerophytes

Answer

**Step-by-Step Solution:**

1. **Understanding CAM Pathway**: The CAM pathway stands for Crassulacean Acid Metabolism. It is a photosynthetic adaptation found in certain plants that allows them to efficiently utilize water.

2. **Stomatal Behavior**: In CAM plants, the stomata (tiny openings on leaves) are open during the night and closed during the day. This adaptation helps to minimize water loss through transpiration during the hotter daytime.

3. **Carbon Dioxide Uptake**: At night, when the stomata are open, these plants take in carbon dioxide (CO2). The CO2 is then converted into organic acids, which are stored until daylight.

4. **Photosynthesis During Daylight**: During the day, when the stomata are closed to conserve water, the stored organic acids are converted back into CO2 for use in the photosynthesis process.

5. **Adaptation to Drought**: The CAM pathway is particularly advantageous for plants in arid environments, allowing them to resist drought conditions by reducing water loss.

6. **Identifying the Correct Option**: Given the options:
- (a) Drought-escaping xerophytes
- (b) Drought-resisting xerophytes
- (c) Drought-enduring xerophytes
- (d) Drought-enduring xerophytes

The correct answer is (b) Drought-resisting xerophytes, as CAM plants are specifically adapted to resist drought conditions.

**Final Answer**: (b) Drought-resisting xerophytes

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