Question

Filiform apparatus is characteristic feature of

• A. aleurone cell
• B. synergids
• C. generative cell
• D. nucellar embryo.

Answer 1

The Correct Option is B

Filiform apparatus is a characteristic feature of synergids. Let's delve into what each option represents and analyze why the filiform apparatus is associated particularly with synergids:

1. Synergids: These are specialized cells found in the embryo sac of angiosperms (flowering plants). They are located beside the egg cell and play a crucial role in guiding the pollen tube to the egg through the filiform apparatus, a structure rich in cell organelles and specialized cell wall thickenings that facilitate this process. The primary function of the filiform apparatus is to attract and guide the pollen tube into the ovule for successful fertilization.
2. Aleurone cell: These cells are part of the seed's outer layer, rich in proteins, particularly in monocots like wheat and barley. They help in the digestion and mobilization of starch reserves during seed germination but do not feature a filiform apparatus.
3. Generative cell: Found within the pollen grain, this cell divides mitotically to form two sperm cells. It does not possess a filiform apparatus as it plays a different role in reproduction, rather assisting in the fertilization process post the pollen tube formation.
4. Nucellar embryo: This pertains to the embryo formed from the nucellar tissue (a part of the ovule) during asexual reproduction (apomixis). Again, no filiform apparatus is associated with nucellar embryos, as they do not engage in pollen-guided fertilization.

Thus, given these explanations, it is clear that the filiform apparatus is a specialized feature of synergids, aiding in the attraction and guidance of the pollen tube during fertilization in plants. The correct answer is therefore synergids.