Among the following , more than one trophic level in a food chain can be occupied by :

Options

A. Fish and zooplanktons
B. Sparrow and insectivorous plants
C. Frog and lion
D. Grasses and lichens

Answer

To solve the question about which organisms can occupy more than one trophic level in a food chain, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Trophic Levels**:
- Trophic levels refer to the position of an organism in a food chain. The first trophic level consists of producers (like plants), the second trophic level consists of primary consumers (herbivores), and the third trophic level consists of secondary consumers (carnivores).

2. **Analyzing Option A: Fish and Zooplankton**:
- **Fish**: Fish can occupy two trophic levels. They can be primary consumers (if they eat zooplankton) or secondary consumers (if they eat smaller fish).
- **Zooplankton**: Zooplankton are primarily primary consumers, feeding on phytoplankton.
- **Conclusion**: Since only fish can occupy more than one trophic level, this option is not correct.

3. **Analyzing Option B: Sparrow and Insectivorous Plant**:
- **Sparrow**: Sparrows can occupy two trophic levels. They can be primary consumers when they eat seeds and grains, and they can be secondary consumers when they eat insects.
- **Insectivorous Plant**: These plants can act as primary producers (when they do not consume insects) and can also act as secondary consumers when they trap and digest insects.
- **Conclusion**: Both sparrows and insectivorous plants can occupy more than one trophic level, making this option correct.

4. **Analyzing Option C: Frog and Lion**:
- **Frog**: Frogs can occupy more than one trophic level as they can be primary consumers (eating insects) and secondary consumers (eating smaller animals).
- **Lion**: Lions are apex predators and occupy a single trophic level as secondary consumers.
- **Conclusion**: Since only frogs can occupy more than one trophic level, this option is not correct.

5. **Analyzing Option D: Grasses and Lichens**:
- Both grasses and lichens are producers and occupy the same trophic level (first trophic level).
- **Conclusion**: This option is not correct as neither can occupy more than one trophic level.

### Final Answer:
The correct option is **B: Sparrow and Insectivorous Plant**, as both can occupy more than one trophic level in a food chain.

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