Question

Filiform apparatus is a characteristic feature of
A)Zygote
B)Suspensor
C)Egg
D)Synergid

Answer 1

Hint: Filiform equipment is located inside the ovary of the flower. It is the thickened and distinguished structure. These are finger-like projections located near the micropylar end of the embryo sac.

Complete answer:
A filiform apparatus is a group of finger-like structures/projections of synergids that are on the whole involved in absorbing and conducting food substances from the nucleus into the embryo sac. They also secrete positive chemicals that direct the pollen tubes toward the embryo sac. Synergid cells are two specialized cells that lie adjoining to the egg apparatus in the female gametophyte of angiosperms and play an imperative role in pollen tube practise and function.

Synergids are diploid as all the three cells (synergid, polar nuclei, and antipodals) fashioned through mitosis from the functional megaspore, they are haploid(n). Egg cells fertilized with the male gamete to structure a diploid zygote. The synergids direct pollen tube growth towards the female gametophyte and facilitate the entrance of the tube into the embryo sac.

Basically, synergids are a section of the egg equipment in flowering plants. The synergids cells are positioned in the lady gametophyte and are indispensable for angiosperm reproduction. A pollen tube grows into one of the synergid cells, ruptures and releases the sperm cells during fertilization. The synergids produce an attractant that courses the pollen tube to the female gametophyte.

Hence, the correct answer is option (D)

Note: Besides synergids, antipodal cells are additionally present, they are three in quantity and are the nutritional centre. The antipodal cells which are shaped in the embryo sac are positioned towards the chalazal end which later on degenerates.