Which is not diploid

Options

A. Nucellus
B. Integuments
C. Endosperm
D. Embryo.

Answer

To determine which of the given options is not diploid, let's analyze each option step by step:

### Step 1: Analyze the Nucellus
- The nucellus is the central part of the ovule and is responsible for nourishing the developing embryo sac.
- It is composed of diploid cells (2n).
- **Conclusion**: The nucellus is diploid.

### Step 2: Analyze the Integuments
- Integuments are the protective layers surrounding the ovule.
- They are also made up of diploid cells (2n).
- **Conclusion**: The integuments are diploid.

### Step 3: Analyze the Endosperm
- The endosperm is formed through a process called triple fusion, where one male gamete fuses with the two polar nuclei of the embryo sac.
- This results in a triploid (3n) cell known as the primary endosperm mother cell.
- **Conclusion**: The endosperm is triploid, not diploid.

### Step 4: Analyze the Embryo
- The embryo develops from the fertilized egg cell (zygote).
- The zygote is diploid (2n) and thus the embryo is also diploid.
- **Conclusion**: The embryo is diploid.

### Final Conclusion
Based on the analysis:
- Nucellus: Diploid (2n)
- Integuments: Diploid (2n)
- Endosperm: Triploid (3n)
- Embryo: Diploid (2n)

The option that is **not diploid** is **Option C: Endosperm**.

### Answer: Option C: Endosperm

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