Trichomes

Options

A. Are not hair
B. May be branched
C. Are usually single celled
D. Are always non-secondary

Answer

### Step-by-Step Solution:

1. **Definition of Trichomes**:
- Trichomes are epidermal outgrowths or appendages found on the surface of plants. They can also be found in other organisms like lichens and algae.

2. **Types of Trichomes**:
- Trichomes can be classified based on their structure:
- **Unicellular**: Composed of a single cell.
- **Multicellular**: Composed of multiple cells.
- **Branched**: Some trichomes may have branches.
- **Unbranched**: Others may not have branches.

3. **Functions of Trichomes**:
- The main functions of trichomes include:
- Protection against UV light.
- Defense against insects.
- Prevention of water loss through transpiration.
- Contribution to freeze tolerance in plants.

4. **Common Types of Trichomes**:
- Trichomes can be categorized into several types:
- **Hairy Trichomes**: These are hair-like structures.
- **Scaly Trichomes**: These have a scale-like appearance.
- **Glandular Trichomes**: These can secrete substances.

5. **Evaluating the Options**:
- The question provides several statements about trichomes:
- "Trichomes are not here" - This is incorrect as trichomes do exist.
- "May be branched" - This is correct, as trichomes can be branched or unbranched.
- "Are usually single-celled" - This is incorrect; they can be unicellular or multicellular.
- "Are always non-secondary" - This is also incorrect as trichomes can be secondary.

6. **Conclusion**:
- The correct option regarding trichomes is that they "may be branched."