Which statement is correct?

Options

A. Plant uses `CO_2` during respiration
B. In all `CO_2` acceptor plants, organic compounds are produce through photosynthesis
C. Biomass of the plant is available to only herbivores
D. All three

Answer

To determine which statement is correct regarding plants and their processes, we will analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Analyze the First Statement**:
- The statement claims that "plants use carbon dioxide during respiration."
- **Evaluation**: This statement is incorrect. Plants primarily use carbon dioxide during the process of photosynthesis, not respiration. During respiration, plants consume oxygen and release carbon dioxide.

2. **Analyze the Second Statement**:
- The statement claims that "in all carbon dioxide except of plants, organic compounds are produced through photosynthesis."
- **Evaluation**: This statement is correct. Plants utilize carbon dioxide during photosynthesis to produce organic compounds like glucose. This process is fundamental to the carbon cycle and supports life on Earth.

3. **Analyze the Third Statement**:
- The statement claims that "biomass of plant is available to only herbivores."
- **Evaluation**: This statement is incorrect. The biomass produced by plants is available not only to herbivores but also to decomposers (like fungi and bacteria) and some omnivores and carnivores that may consume plant material.

4. **Conclusion**:
- After evaluating all the statements, the only correct statement is the second one, which states that organic compounds are produced through photosynthesis in plants.

### Final Answer:
The correct statement is: **"In all carbon dioxide except of plants, organic compounds are produced through photosynthesis."**