A place has very scanty rainfall, the dominant plants there mat be

Options

A. Opuntia
B. Nymphaea
C. Asparagus
D. both (a) and (c)

Explanation

### Step-by-Step Solution:

1. **Understanding the Environment**: The question states that the place has very scanty rainfall. This indicates that the environment is dry and has limited water availability.

2. **Identifying Plant Types**: In dry environments, plants that thrive are adapted to conserve water. These plants are typically known as xerophytes. Xerophytes are specialized to survive in conditions where water is scarce.

3. **Characteristics of Xerophytes**: Xerophytes have adaptations such as thick, fleshy stems and leaves that reduce water loss. They often have deep root systems to access moisture from deeper soil layers. Examples of xerophytes include cacti and succulents.

4. **Analyzing the Options**:
- **Opuntia**: This is a genus of cacti, which are xerophytes. They store water in their stems and are well-suited for dry conditions.
- **Nymphaea**: This is a genus of aquatic plants (water lilies) that thrive in water, not in dry conditions.
- **Asparagus**: Certain species of asparagus can also be considered xerophytes as they can survive in drier conditions.
- **Both A and C**: This option suggests that both Opuntia and Asparagus are suitable for dry environments.

5. **Conclusion**: Since Nymphaea is not adapted to dry conditions, the dominant plants in an area with scanty rainfall would be Opuntia and Asparagus. Therefore, the correct answer is option 4: both A (Opuntia) and C (Asparagus).