which of the following is not the function of tapetum ?

Options

A. Secretion of Enzyme & Hormone
B. Formation of ubisch's body
C. Release of pollen
D. Secretion of pollen kit substance

Answer

To solve the question "which of the following is not the function of tapetum?", we will analyze the functions of the tapetum and evaluate the options provided.

### Step-by-Step Solution:

1. **Understanding Tapetum**:
- The tapetum is the innermost layer of the microsporangium (pollen sac) in flowering plants. It plays a crucial role in the development of pollen grains.

2. **Functions of Tapetum**:
- **Nourishment**: The tapetum provides essential nutrients to the developing pollen grains. It secretes various enzymes, hormones, and amino acids that are necessary for pollen development.
- **Secretion of Enzymes**: It produces enzymes like calyase, which helps dissolve the callose wall of the tetrad (a group of four pollen grains) to release individual pollen grains.
- **Formation of Uvisc Body**: The tapetum is involved in the formation of the uvisc body, which is related to the development of the pollen grain.
- **Secretion of Pollen Kit Substance**: The tapetum also secretes substances that contribute to the pollen coat.

3. **Evaluating the Options**:
- **Option A: Secretion of enzyme and hormone** - This is a function of the tapetum.
- **Option B: Formation of uvisc body** - This is also a function of the tapetum.
- **Option C: Release of pollen** - This is NOT a function of the tapetum. The release of pollen occurs during the process of pollination, where pollen is transferred from the anther to the stigma.
- **Option D: Secretion of pollen kit substance** - This is a function of the tapetum.

4. **Conclusion**:
- The correct answer is **Option C: Release of pollen**, as it is not a function of the tapetum.