Question

Which of the following is a characteristic feature of filiform apparatus.

• A. Suspensor
• B. Egg
• C. Zygote
• D. Synergid

Answer 1

The correct option is D

Synergid

The correct option is D.

Explanation for correct option:

1. The filiform apparatus is a synergid extension that extends far beyond the summit of an embryo sac.
2. At the micropylar end, the synergid cell wall thickens and produces the filiform apparatus, which consists of many finger-like extensions into the synergid cytoplasm.
3. The function of a filiform apparatus is assisting pollen tubes into the nucleus, extracting food from the nucleus, and aiding metabolites over short distances.

Explanation for incorrect options:

Option A:

1. During plant embryo development, the suspensor is thought to be a supporting structure that keeps pushing the embryo properly into the endosperm cavity.
2. It joins the surrounding maternal and endosperm tissues to allow the transfer of plant hormones and nutrients.

Option B:

1. An egg is an organic vessel in which a zygote develops until it can survive on its own, at which point the animal hatches.
2. An egg is formed when an egg cell is fertilized.

Option C:

1. A zygote is a fertilized egg cell.
2. It is formed by the union of a female gamete called an egg or an ovum and a male gamete called sperm.

Final answer: The characteristic feature of filiform apparatus is synergid.