The structure in algae helping in perennation to tide over drought are

Options

A. zoospores,hypnospores and aplanospores
B. zoospores,akinetes,zygospores
C. aplanospores,hypnospores and zygospores.
D. none of the above

Answer

To answer the question regarding the structures in algae that help in perennation to tide over droughts, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Perennation**:
- Perennation refers to the ability of an organism to survive unfavorable conditions, such as drought, by entering a dormant state. This is crucial for organisms like algae that may face seasonal changes in their environment.

2. **Identifying Structures in Algae**:
- In algae, certain structures are specialized for survival during adverse conditions. These structures are known as resting spores.

3. **Types of Resting Spores**:
- The main types of resting spores in algae that help in perennation include:
- **Aplanospores**: These are non-motile spores that can remain dormant until conditions become favorable for growth.
- **Hypnospores**: These are also resting spores that can withstand harsh conditions and germinate when the environment improves.
- **Zygospores**: These are formed by the fusion of gametes and can survive extreme conditions, allowing the organism to persist through unfavorable periods.

4. **Conclusion**:
- Therefore, the structures in algae that help in perennation to tide over droughts are **aplanospores, hypnospores, and zygospores**.

### Final Answer:
The structures in algae helping in perennation to tide over droughts are aplanospores, hypnospores, and zygospores.