Perisperm differs from endosperm in

Options

A. Being a diploid tissue
B. Its formation by fusion of secondary nucleus with several sperms
C. Being a haploid tissue
D. Having no reserve food

Answer

To solve the question "Perisperm differs from endosperm in," we need to analyze the differences between perisperm and endosperm based on their definitions, origins, and characteristics.

### Step-by-Step Solution:

1. **Definition of Perisperm**:
- Perisperm is a tissue that is derived from the nucellus of the ovule. It is a remnant of the nucellus that remains after fertilization and is found in some seeds.

2. **Definition of Endosperm**:
- Endosperm is a tissue that is formed after fertilization. It develops from the fusion of one of the sperm cells with the two polar nuclei in the embryo sac, resulting in a triploid (3n) structure. The endosperm serves as a food reserve for the developing embryo.

3. **Origin**:
- Perisperm originates from the nucellus, which is diploid (2n).
- Endosperm originates from the fertilization process involving the fusion of the sperm with the polar nuclei, making it triploid (3n).

4. **Genetic Composition**:
- Perisperm is diploid (2n) because it is derived from the nucellus.
- Endosperm is triploid (3n) due to the fusion of one sperm with two polar nuclei.

5. **Function**:
- Perisperm primarily serves as a nutritive tissue but is not as common as endosperm.
- Endosperm is specifically developed to provide nourishment to the developing embryo.

6. **Conclusion**:
- The key difference between perisperm and endosperm is that perisperm is a diploid tissue derived from the nucellus, while endosperm is a triploid tissue formed from the fertilization process.

### Final Answer:
Perisperm differs from endosperm in that perisperm is a diploid tissue derived from the nucellus, whereas endosperm is a triploid tissue formed from the fusion of a sperm cell with the polar nuclei.