Pick up the wrong statement regarding lichens

Options

A. Lichens are symbiotic association
B. Lichens are very good pollution indicators
C. Lichens do not grow in unpolluted areas
D. The algal component of lichen is known as phycobiont

Answer

### Step-by-Step Solution:

1. **Understanding Lichens**: Lichens are a symbiotic association between two organisms: fungi (mycobiont) and algae (phycobiont). The fungi provide structure and absorb water and minerals, while the algae perform photosynthesis to produce food.

2. **Analyzing the Statements**: The question asks to identify the wrong statement regarding lichens. We need to evaluate each provided statement carefully.

3. **Evaluating the First Statement**: The first statement is likely true as it describes the mutual benefits of the symbiotic relationship between algae and fungi.

4. **Evaluating the Second Statement**: The second statement claims that lichens are good pollution indicators, particularly sensitive to sulfur dioxide. This is also true, as lichens are known to thrive in unpolluted environments.

5. **Evaluating the Third Statement**: The third statement claims that lichens do not grow in unpolluted areas. This is incorrect because lichens actually thrive in unpolluted areas and are absent in polluted environments.

6. **Evaluating the Fourth Statement**: The fourth statement mentions that the algal component (phycobiont) constitutes about 5% of the lichen, while the fungal component (mycobiont) makes up about 95%. This is a correct statement.

7. **Conclusion**: After evaluating all statements, the third statement is identified as the wrong statement regarding lichens. Therefore, the answer is option number 3.

### Final Answer:
The wrong statement regarding lichens is: **"They do not grow in unpolluted areas."**

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