Secondary producers are:-

Options

A. Herbivores
B. Producers
C. Carnivores
D. None of the above.

Answer

**Step-by-Step Solution:**

1. **Understanding Producers in the Food Chain:**
- In an ecosystem, producers are organisms that can produce their own food, primarily through photosynthesis. These are typically plants and are referred to as primary producers.

2. **Identifying Secondary Producers:**
- Secondary producers are organisms that consume primary producers. These are usually herbivores, which feed on plants and convert the organic matter from the primary producers into energy for themselves.

3. **Analyzing the Options:**
- Option 1: Herbivores - These are indeed secondary producers as they consume primary producers (plants).
- Option 2: Producers - This term generally refers to primary producers, not secondary producers.
- Option 3: Carnivores - These are consumers that eat herbivores or other animals, thus they are not classified as secondary producers.
- Option 4: None of the above - This option is incorrect as herbivores are indeed secondary producers.

4. **Conclusion:**
- Based on the definitions and analysis of the options, the correct answer is **Option 1: Herbivores**.