What is correct for transducers:

Options

A. They converts solar energy into chemical energy
B. They have second trophic level
C. They are osmotrophs
D. Those are show nutrient immobilization.

Answer

### Step-by-Step Solution:

1. **Understanding Transducers**: Transducers are organisms that can convert one form of energy into another. In the context of an ecosystem, transducers are primarily the producers, which are plants.

2. **Role of Producers**: Producers are the first trophic level in a food chain. They are capable of making their own food through the process of photosynthesis.

3. **Photosynthesis Process**: During photosynthesis, plants convert solar energy (light energy) into chemical energy (in the form of glucose). This is a key characteristic of transducers.

4. **Evaluating Options**:
- **Option A**: "They convert solar energy into chemical energy." This statement is correct as it describes the process of photosynthesis performed by producers.
- **Option B**: "They have second trophic level." This statement is incorrect because producers occupy the first trophic level, not the second.
- **Option C**: "They are osmotropes." This statement is incorrect because producers are autotrophs, meaning they produce their own food, rather than osmotrophs, which absorb nutrients from their environment.
- **Option D**: "They show nutrient immobilization." This statement is also incorrect. Producers actually mobilize nutrients by converting inorganic substances into organic matter, which is then available to consumers.

5. **Conclusion**: The only correct statement regarding transducers is that they convert solar energy into chemical energy.

### Final Answer:
The correct statement for transducers is: **They convert solar energy into chemical energy.**