`CAM` plants belong to family

Options

A. Malvaceae
B. Crassulaceae
C. Trapaceae
D. Orchidaceae.

Answer

### Step-by-Step Solution:

1. **Understanding CAM Plants**:
- CAM stands for Crassulacean Acid Metabolism. This is a photosynthetic adaptation found in certain plants that allows them to fix carbon dioxide at night to minimize water loss during the day.

2. **Identifying the Families**:
- The question provides four options:
- A) Malvaceae
- B) Crassulaceae
- C) Trebaceae
- D) Orchidaceae

3. **Linking CAM to Plant Families**:
- CAM plants were first studied in the family Crassulaceae. This family includes plants such as Bryophyllum, which are known for their ability to perform CAM photosynthesis.

4. **Conclusion**:
- Since CAM plants are primarily associated with the Crassulaceae family, the correct answer to the question is **Crassulaceae**.

### Final Answer:
**CAM plants belong to the family Crassulaceae.**

---