`C_(4)` plants are also known as

Options

A. Calvin type
B. Calvin-Bassham type
C. Hatch and Slack type
D. Emerson type.

Answer

### Step-by-Step Solution:

1. **Understanding C4 Plants**: C4 plants are a type of plant that have adapted to dry tropical regions and utilize a specific pathway for photosynthesis known as the C4 pathway.

2. **Identifying the Options**: The question provides four options regarding what C4 plants are also known as:
- A) Calvin type
- B) Calvin-Benson type
- C) Hatch and Slack type
- D) Emerson type

3. **Recognizing the Correct Terminology**: The C4 pathway was discovered by two Australian scientists named Hatch and Slack. Therefore, C4 plants are also known as Hatch and Slack type plants.

4. **Conclusion**: The correct answer to the question "C4 plants are also known as" is option C) Hatch and Slack type.