A: Restitutional nucleus can be observed in endothecium cells
R: Endothecium cells are usually triploid

Options

A. if both assetion A reason are ture and the reason is the correct explanation of the assertion then mark
B. if both assertion & reason are ture and the reason is not the correct explanation of the assertin then mark
C. if assertion is true statement but reason is false then mark
D. if both assertion and reason are flase statements then mark

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that a restitutional nucleus can be observed in endothecium cells. A restitutional nucleus is characterized by a twist of regular chromosomes and is not a typical nucleus.

2. **Understanding the Reason**: The reason states that endothecium cells are usually triploid. Endothecium cells are found in the anther of flowering plants and are involved in the development of pollen grains.

3. **Analyzing the Restitutional Nucleus**: A restitutional nucleus is not a normal nucleus; it has a unique structure that can occur during cell division (mitosis and meiosis). However, it is not typically found in endothecium cells.

4. **Analyzing Endothecium Cells**: Endothecium cells are typically diploid or may be multi-nucleate, but they are not necessarily triploid. The endothecium is one of the layers in the anther and plays a role in the maturation of pollen.

5. **Evaluating the Assertion and Reason**:
- The assertion that restitutional nuclei can be found in endothecium cells is incorrect.
- The reason that endothecium cells are usually triploid is also incorrect.

6. **Conclusion**: Since both the assertion and the reason are false, the correct answer to the question is that both statements are false.

### Final Answer:
Both the assertion and reason are false.