Question

describe the parts of a mature angiosperm embryo sac. mention the role of synergids


explain point wise dont copy from google​

Answer 1

HEYA MATE HERE U GO

the mature angiosperm embryo sac has three parts.

. ⭐egg apparatus

. ⭐central cell

. ⭐antipodals

1. EGG APPARATUS:-

. three cells grouped together at the micropylar end constitute the egg apparatus

. they are two synergids and one egg cell

. the synergids with special cellular thickening at the micropylar tip is called filiform apparatus

2. CENTRAL CELL:-

. it is the largest cell of embryo sac

. it has two polar nuclei which fuse to form a single diploid secondary nucleus.

3. ANTIPODALS:-

. three cells present at the chalazal end of embryosac are called antipodals

. these are smallest cells of embryosac

. they degenerate before or after fertilisation

ROLE OF SYNERGIDS:-

. synergids nourish female gametophyte nutrients from surroundings nice plus

. they help in the absorption of nutrients from the nucellus into the embryosac

HOPE THIS WILL HELP U

Answer 2

Answer:

Explanation:

•In angiosperms the female gametophyte is called as embryosac.

•The most common type of embryosac in angiosperms is seven celled and 8 nucleated "Polygonum type"

•In majority of flowering plants,one of the megaspores is functional and acts as mother cell for the development of female gametophyte (embryosac), the other 3 degenerate.The method of embryosac formation from a single functional megaspore is termed as monosporic development.

•Polygonum type of embryosac shows 3 main parts.They are

1)Egg apparatus

2)central cell

3)antipodals.

1)EGG APPARATUS-

Three cells are grouped together at the micropylar end and constitute the egg apparatus. There is one egg cell and 2 synergids.

•The synergids have special cellular thickening at the micropylar tip called the filiform apparatus.

•The middle largest cell in egg apparatus is oospore or egg.

Role of synergids-

A) they nourish female gametophyte by absorbing nutrients from surrounding nucellus.

B)The filliform apparatus of synergids secrete chemical substances which help in guiding the pollen tubes into synergids.

2) Central cell-

•It is the largest cell of embryosac.

•It has 2 polar nuclei which fuse to form a single diploid secondary nucleus.

3) Antipodals-

•The 3 cells present at the chalazal end of embryosac are called as antipodals.

•The cells are ephemeral,smallest cells of embryosac and degenerate before or after fertilization.

•They are considered as vegetative cells of embryosac.

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Hope this helps you.... :)