Thin-walled resting spores produced by Chlamydomonas in dry conditions of environment are

Options

A. Meiospores
B. Aplanospores
C. Hypnospores
D. Zygospores.

Answer

To solve the question regarding the thin-walled resting spores produced by Chlamydomonas in dry conditions, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organism**: The question refers to Chlamydomonas, which is a type of green algae. Understanding the characteristics of this organism is crucial.

2. **Understand the Context**: Chlamydomonas produces different types of spores under varying environmental conditions. In dry or unfavorable conditions, it produces resting spores.

3. **Define Resting Spores**: Resting spores are formed during unfavorable conditions and are designed to withstand harsh environments. They do not germinate immediately and remain dormant until conditions improve.

4. **Evaluate the Options**:
- **Meiospores**: These are formed through sexual reproduction and are not resting spores. They are produced during favorable conditions.
- **Aplanospores**: These are indeed resting spores, produced during unfavorable conditions, and they have thin walls, matching the description in the question.
- **Hypnospores**: These have thick walls and do not fit the description of thin-walled resting spores.
- **Zygospores**: These are also thick-walled and formed through sexual reproduction, not suitable for the question.

5. **Conclusion**: Based on the evaluation, the correct answer is **Aplanospores**, as they are thin-walled resting spores produced by Chlamydomonas in dry conditions.

### Final Answer:
The thin-walled resting spores produced by Chlamydomonas in dry conditions of the environment are **Aplanospores**.