Triploid tissue will be observed in -

Options

A. nucellus
B. endosperm
C. tapetum
D. endothecium

Answer

To solve the question regarding where triploid tissue will be observed, we need to analyze the options given: Nucellus, Endosperm, Tapetum, and Endothelium.

### Step-by-Step Solution:

1. **Understanding Triploid Tissue**:
- Triploid tissue is a tissue that has three sets of chromosomes. In flowering plants (angiosperms), the most common example of triploid tissue is the endosperm, which develops after fertilization.

2. **Analyzing the Options**:
- **Nucellus**: This is a tissue within the ovule that contains the embryo sac. It is diploid, not triploid, as it arises from the ovule's diploid tissue.
- **Endosperm**: This is the tissue that forms after fertilization when one of the male gametes fuses with the two polar nuclei in the embryo sac. This fusion results in a triploid nucleus, which develops into the triploid endosperm.
- **Tapetum**: This is a layer of cells that surrounds the microsporangium and is involved in nourishing the developing pollen grains. It is diploid, not triploid.
- **Endothelium**: This is a layer of cells that may be present in some seeds but is not typically classified as triploid tissue.

3. **Conclusion**:
- Based on the analysis, the only option that represents triploid tissue is **Endosperm**.

### Final Answer:
The correct answer is **Endosperm**.