Which one of the following is a CAM plant

Options

A. Maize
B. Kalanchoe
C. Sugarcane
D. Jowar.

Answer

To determine which one of the following is a CAM plant, we need to understand what CAM (Crassulacean Acid Metabolism) plants are and how they differ from other types of plants, particularly C4 plants.

### Step-by-Step Solution:

1. **Understand CAM Plants**: CAM plants are a type of plant that adapt to arid conditions by opening their stomata at night instead of during the day. This adaptation helps them minimize water loss.

2. **Identify the Process**: During the night, CAM plants take in carbon dioxide (CO2) and store it in the form of a 4-carbon acid, typically malate (malic acid). This process allows them to conserve water while still obtaining the necessary CO2 for photosynthesis.

3. **Daytime Function**: During the day, the stored malate is then converted back to CO2, which is used in the Calvin cycle for photosynthesis, utilizing the ATP and NADPH produced from sunlight.

4. **Analyze the Options**: The options given are:
- Maize
- Kalanchoe
- Sugarcane
- Juwar

5. **Classify the Plants**:
- **Maize**: This is a C4 plant, which means it uses a different method for carbon fixation and typically opens its stomata during the day.
- **Kalanchoe**: This is known to be a CAM plant, as it follows the CAM pathway for photosynthesis.
- **Sugarcane**: Like maize, sugarcane is also a C4 plant.
- **Juwar**: This is another C4 plant.

6. **Conclusion**: Among the options provided, Kalanchoe is the only CAM plant, while maize, sugarcane, and juwar are all C4 plants.

### Final Answer:
**Kalanchoe is a CAM plant.**

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