`C_4` plants are found among

Options

A. Dicots only
B. Monocots only
C. Both (1) and (2)
D. In family - Poaceae (Graminae ) only

Answer

**Step-by-Step Solution:**

1. **Understanding C4 Plants**: C4 plants are those that utilize the C4 pathway for photosynthesis, which is an adaptation to efficiently fix carbon dioxide in conditions of low CO2 concentration and high temperatures.

2. **Identifying the Families**: C4 plants are found in more than 1500 species across 19 families of angiosperms. This indicates that they are not limited to a single group but are distributed across various families.

3. **Monocots and Dicots**: Angiosperms are divided into two major categories: monocots and dicots. C4 plants can be found in both categories.

4. **Specific Families**: Among the families that contain C4 plants, two significant ones are the Gramineae (or Poaceae) family and the Cyperaceae family. These families include many grasses and sedges, which are predominantly monocots.

5. **Evaluating the Options**: The question provides the following options:
- A) Dicots only
- B) Monocots only
- C) Both monocots and dicots
- D) Only in the Gramineae family

Since C4 plants are found in both monocots and dicots, the correct answer must include both categories.

6. **Conclusion**: The best answer is option C) Both monocots and dicots, as C4 plants are present in species from both groups and not limited to just one category or family.

**Final Answer**: C) Both monocots and dicots.

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