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Synergids are...

Synergids are

A

haploid

B

diploid

C

triploid

D

tetraploid

Text Solution

Verified by Experts

The correct Answer is:
A
Synergids. These the short-lived cells lying close to the eff cell in mature embryonic sac of flowering plaovule. These three cells (two synegids and one egg cell) constitute the egg apparatus.
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Which of the following statements is/are correct ? (i) Endothecium lies below epidermis (ii) Fusion of egg with male gamete is called apogamy (iii) Synergids are haploid. (iv) The point at which funicle touches the ovule is raphe.

[A] : Synergids play an important role in directing the pollen tube growth . [R] : Because synergids secrete some chemotropically active substance .

Mention the function of Synergids and polar nuclei in embryo sac.

Draw the diagram of a mature embryo sac and show its 8-nucleate, 7-celled nature. Show the following parts : antipodals, synergids, egg, central cell, polar nuclei. Label the diagram.

(a) Draw a diagram of a mature embryo sac of an angiosperm and label the following parts in it : (i) Filiform apparatus (ii) Synergids (iii) Central cell (iv) Egg cell (v) Polar nuclei (vi) Antipodals (b) Write the fate of egg cell and polar nuclei after fertilization.

In a case of polyembryony, if an embryo develops from the synergid and another from the nucellus which is haploid and which is diploid?

[A]: The three cells of the egg apparatus are arranged in a triangular fashion. [R): The degenerating synergid forms the seat for pollen tube discharge in the embryo sac

[A]: The two sperms cells in a pollen tube often change their shape. [R]: The sperms are released in the synergid as intact cells but only their nuclei migrate

What is the fate of the male gametes discharged in the synergid ?

[A]: Triple fusion results in veg~tative fertiliza- tion of angiosperms. [R]: It combines one male gamete with two synergids.