Which is correct

Options

A. Tapetum nourishes the developing pollen
B. Hard outer layer of pollen is called intine
C. Sporogenous tissue is haploid
D. Endothecium produces microspores.

Answer

To solve the question "Which is correct?" regarding the biological concepts related to pollen grains and their development, we can analyze each option provided:

### Step 1: Analyze the first option
- **Option:** Tapetum nourishes the developing pollen.
- **Explanation:** The tapetum is indeed the innermost layer of the pollen sac (microsporangium) and plays a crucial role in nourishing the developing microspores, which eventually form pollen grains.
- **Conclusion:** This statement is correct.

### Step 2: Analyze the second option
- **Option:** Hard outer layer of pollen is called entines.
- **Explanation:** The hard outer layer of the pollen grain is known as the exine, not entine. The entine is the inner layer of the pollen grain.
- **Conclusion:** This statement is incorrect.

### Step 3: Analyze the third option
- **Option:** Porogenous tissue is applied into the ECM produces the microspores.
- **Explanation:** The sporogenous tissue is diploid and gives rise to microspore mother cells (microsporocytes), which undergo meiosis to produce microspores. The statement is misleading as it incorrectly describes the nature of sporogenous tissue and its role.
- **Conclusion:** This statement is incorrect.

### Step 4: Analyze the fourth option
- **Option:** Endothelium produces microspores.
- **Explanation:** The endothelium is a layer of the microsporangial wall, but it does not produce microspores. Microspores are formed from the microspore mother cells, not the endothelium.
- **Conclusion:** This statement is incorrect.

### Final Conclusion
After analyzing all the options, the only correct statement is:
- **Correct Option:** Tapetum nourishes the developing pollen.