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Grey crescent is...

Grey crescent is

A

Melanin rich area formed at the region opposite to entry of sperm

B

Yolk rich area of egg

C

Laying of sperms and eggs in Frog.

D

None of these

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Context**: The question asks about the "grey crescent," which is a term related to the development of frog embryos. 2. **Identifying the Organism**: The grey crescent is specifically found in frogs. It is important to recognize the species involved when discussing embryonic structures. 3. **Defining the Zygote Structure**: In the zygote of a frog, there are two distinct poles: - **Vegetal Pole**: This pole contains the yolk and is where the majority of the nutrients are stored. - **Animal Pole**: This pole is opposite the vegetal pole and is where the embryo develops. 4. **Locating the Grey Crescent**: The grey crescent is located at the area opposite to where the sperm enters the egg. It is a region that appears grey due to the distribution of melanin. 5. **Significance of the Grey Crescent**: The grey crescent is crucial for the proper development of the embryo as it marks the future dorsal side of the embryo and is involved in determining the body axis. 6. **Conclusion**: The grey crescent is a specific area in the frog zygote that is rich in melanin and is located opposite the sperm entry point. It is not related to the yolk-rich area of the egg.
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