Question

The function of the filiform apparatus is to

• A. Produce nectar
• B. Recognize the suitable pollen at the stigma
• C. Stimulate division of the generative cell
• D. Guide the entry of pollen tube

Answer 1

The correct option is D

Guide the entry of pollen tube

The correct option is D.

Explanation of the correct option:

1. The filiform apparatus is present inside the embryo sac of synergid cells in angiosperms.
2. It is a highly thickened, finger-like projection that is formed by the synergid cells at the micropylar.
3. This helps guide the pollen tube towards the egg to facilitate fertilization.

Explanation of the incorrect options:

Option A:

1. In plants, nectar is formed by the nectarines gland. These are found in several parts of the flower.
2. The flower produces nectar as a reward for conducting pollination.

Option B:

1. The stigma recognizes suitable pollen by a small cysteine-rich protein that interacts with the stigma receptor.
2. If it's suitable pollen, then it is allowed to develop a pollen tube that grows until it reaches the ovary.

Option C:

1. The generative cell is located at the center of the pollen grain.
2. Once a pollen tube develops, the generative nuclei divide into two sperm nuclei.

Final answer: The function of the filiform apparatus is to guide the entry of the pollen tube.