Question

Typical mature embryosac of angiosperm is

• A. 8 nucleated 1 celled structure
• B. 8 nucleated 8 celled structure
• C. 8 nucleated 7 celled structure
• D. 7 nucleated 8 celled structure

Answer 1

The Correct Option is C

The embryo sac, also known as the female gametophyte, is the structure within the ovule of an angiosperm that contains the egg cell and other cells involved in fertilization and seed development.

The mature embryo sac of angiosperms is commonly referred to as the "7-celled, 8-nucleate" structure. It consists of:

Three antipodal cells at one end,

Two synergids located near the egg cell,

A central cell with two polar nuclei,

The egg cell itself.

Therefore, the correct answer is (3) 8 nucleated 7 celled structure.

Answer 2

The correct answer is:

Option 3: 8 nucleated 7 celled structure

Explanation:

The typical mature embryo sac of angiosperms is an 8-nucleated, 7-celled structure. It develops after the process of megasporogenesis and mitotic divisions of the megaspore. The structure consists of:

One egg cell (which will fuse with the sperm to form the zygote).

Two synergids (which guide the pollen tube).

One central cell with two polar nuclei (which will fuse with another sperm cell to form the triploid endosperm).

Three antipodal cells (which are of uncertain function).

Thus, the mature embryo sac is 8 nucleated and 7 celled.

The other options are incorrect because:

8 nucleated 1 celled structure (Option 1) does not describe a mature embryo sac.

8 nucleated 8 celled structure (Option 2) is not typical for most angiosperms.

7 nucleated 8 celled structure (Option 4) also does not match the typical description of the mature embryo sac.

Therefore, the correct description is 8 nucleated, 7 celled.