Which of the following is the wrong function of the corresponding part in the angiosperm plant ?

Options

A. Nucellus= Nourishment of developing embryo sac
B. Pollen kit = protection of pollen grains from UV rays
C. Filiform apparatus = Secreting chemicals for attracting the pollen tube towards micropyle of ovule
D. Pollen tube = Formed by generative nucleus

Answer

To solve the question regarding the incorrect function of the corresponding part in an angiosperm plant, we will analyze the functions of each part mentioned in the options.

### Step-by-Step Solution:

1. **Identify the Parts and Their Functions:**
- **Nucellus:** This is the part of the ovule that contains the female gametophyte (embryo sac). Its primary function is to nourish the developing embryo sac by providing reserved food material.
- **Pollen Kit:** This is a sticky substance found on pollen grains. Its function is to adhere to pollinators (like insects) and facilitate the transfer of pollen from one flower to another. Additionally, it protects pollen grains from UV rays.
- **Filiform Apparatus:** Located in the micropilar region of the embryo sac, it has two synergid cells and an egg cell. Its functions include directing the pollen tube towards the egg cell and releasing chemicals that guide the pollen tube.
- **Pollen Tube:** This structure forms after pollination and is responsible for delivering sperm cells to the ovule. It is formed from the vegetative cell of the pollen grain, not from the generative cell.

2. **Evaluate Each Option:**
- **Option A (Nucellus):** Nourishment of developing embryo sac. This is correct.
- **Option B (Pollen Kit):** Protection of pollen grain from UV rays. This is also correct.
- **Option C (Filiform Apparatus):** Secreting chemicals for attracting the pollen tube towards the micropyle of the ovule. This is correct.
- **Option D (Pollen Tube):** Formed by the generative nucleus. This is incorrect because the pollen tube is formed by the vegetative cell, not the generative cell.

3. **Conclusion:**
The incorrect function is associated with **Option D**: "Pollen tube formed by generative nucleus." Therefore, the answer to the question is **Option D**.