Thick walled resistant zygote can be produced in the life cycle of

Options

A. Algae, fungi
B. Bryophytes, pteridophytes
C. Gymnosperms, algae
D. Angiosperms, fungi

Answer

To solve the question regarding which organism produces a thick-walled resistant zygote, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Zygote Formation**:
- A zygote is formed through the fusion of male and female gametes during sexual reproduction. This is the first step in the life cycle of many organisms.

2. **Identifying Characteristics of Zygotes**:
- In certain organisms, the zygote can develop a thick wall, making it resistant to environmental stresses. This thick-walled structure is often referred to as a zygospore.

3. **Recognizing Organisms that Produce Thick-Walled Zygotes**:
- In the life cycles of certain algae and fungi, the zygote can develop into a thick-walled structure known as a zygospore. This zygospore can survive in a dormant state during unfavorable conditions.

4. **Evaluating the Options**:
- **Option A**: Algae and fungi - This option is correct as both groups can produce thick-walled zygotes (zygospores).
- **Option B**: Bryophytes and pteridophytes - These groups do not typically produce thick-walled zygotes.
- **Option C**: Gymnosperms and angiosperms - These groups produce seeds but do not form thick-walled zygotes in the same manner as algae and fungi.

5. **Conclusion**:
- Based on the analysis, the correct answer is **Option A: Algae and fungi**. They are known for producing thick-walled resistant zygotes in the form of zygospores.

### Final Answer:
The thick-walled resistant zygote can be produced in the life cycle of **algae and fungi** (Option A).

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