Mark the incorrect statement

Options

A. outer three layers of anther wall are protective in function
B. sprorogenous tissue occupies the centre of each microsporangium
C. cell of tapetum and endothecium show increase in DNA contents by endomitosis and olyteny
D. ploidy level of microspore tetrad is haploid

Answer

To solve the question "Mark the incorrect statement," we will analyze each statement provided and determine which one is incorrect.

### Step-by-Step Solution:

1. **Analyze Statement 1**: "Outer three layers of anther wall are protective in function."
- **Explanation**: The outer three layers of the anther wall (epidermis, endothelium, and middle layer) serve a protective function. This statement is **true**.

2. **Analyze Statement 2**: "Sporogenous tissue occupies the center of each microsporangium."
- **Explanation**: Sporogenous tissue is indeed found in the center of each microsporangium. This statement is also **true**.

3. **Analyze Statement 3**: "Cells of tapetum and endothelium show increased DNA content by endomitosis."
- **Explanation**: This statement suggests that the cells of the tapetum and endothelium undergo endomitosis, which is not a common mechanism observed in flowering plants. This statement is **incorrect**.

4. **Analyze Statement 4**: "Ploidy level of microspore tetrad is haploid."
- **Explanation**: The microspore tetrad is formed from microspore mother cells through meiosis, and the resulting microspores are haploid. This statement is **true**.

### Conclusion:
The incorrect statement is **Statement 3**: "Cells of tapetum and endothelium show increased DNA content by endomitosis."