Question

Choose the following option which represents the female gametophyte of angiosperm.

• A. megaspore mother cell
• B. ovule
• C. nucellus
• D. embryo sac

Answer 1

The correct option is D

embryo sac

The correct option is D.

Explanation for correct option:

1. Such plants which produce seeds and flowers in the form of fruits are known as Angiosperms.
2. The female gametophyte is represented by the embryo sac.
3. The embryo sac develops from the functional megaspore.
4. The mature embryo sac has seven cells and eight nuclei.
5. The megaspore mother cell divides via meiosis to produce four megaspores, one of which develops into the embryo sac and three of which degenerate.
6. The nucellus is the reserve food material that surrounds the embryo sac.

Explanation for incorrect options:

Option A:

1. A megaspore mother cell, also known as a megasporocyte.
2. It is a diploid cell in plants that goes through meiosis and produces four haploid megaspores.
3. Only one of these megaspores is operational in most plants and develops into an embryo sac or female gametophyte.

Option B:

1. The ovule is the reproductive organ that houses the egg cell, which eventually develops into the seed.
2. The seed develops inside an ovary in angiosperms, while the seed develops within the surface of the female cone in gymnosperms.

Option C:

1. The nucellus is the main part of a plant ovule that envelopes the female gametophyte.
2. Most of the ovules are made of the nucellus.
3. It protects the embryo sac.
4. Since they have an abundance of food reserves, they serve as nutritive tissues for the embryo in some plants.

Final answer: Female gametophyte of angiosperm is represented by embryo sac.