Which of the following structure helps in the respiration of lichens

Options

A. soredia
B. isidia
C. cyphella
D. cephalodia

Explanation

To solve the question "Which of the following structures helps in the respiration of lichens?", we will analyze each option provided and determine which one is correct.

### Step-by-Step Solution:

1. **Understanding Lichens**: Lichens are symbiotic associations between fungi and photosynthetic organisms (like algae or cyanobacteria). They have specialized structures for various functions, including respiration.

2. **Analyzing the Options**:
- **Psoridia**: These are powdery propagules found in cyanobacteria or green algae. They are not involved in the respiration of lichens.
- **Hint**: Psoridia are not related to respiration; they are reproductive structures.

- **Azidia**: These are outgrowths from the thallus surface of lichens. While they are part of the lichen structure, they do not play a direct role in respiration.
- **Hint**: Azidia are structural features but not directly linked to respiration.

- **Cephala**: These structures are circular depressions found on the bodies of lichens. They are specifically involved in the respiratory process by allowing gas exchange.
- **Hint**: Cephala are crucial for respiration; think of them as openings for gas exchange.

- **Cephalodea**: These are pockets of cyanobacteria and are not involved in the respiration of lichens.
- **Hint**: Cephalodea are related to cyanobacteria, not respiration in lichens.

3. **Conclusion**: After analyzing each option, the correct structure that helps in the respiration of lichens is **Cephala**. They facilitate gas exchange necessary for the respiration process.

### Final Answer:
The correct option is **Cephala**.