Question

Ovule is
a. Megasporangium
b. Megasporophyll
c. Integument megasporangium
d. Rolled megasporophyll

Answer 1

Hint: The ovule is the structure that contains the female reproductive cells and also gives rise to female reproductive cells. The ovary contains ovules and it develops into seeds after fertilization. The ovary contains an outer tough protective layer called integument, nucellus, and the female gametophyte. Based on the shape, the ovule is of six types.

Complete answer:
> ‘Megasporangium’ is equivalent to an ovule, that has integuments, nucleus, and funiculus by which it is connected to the placenta. Megasporangium along with its protective coverings the integuments are known as ovules. Integuments occur in the micropyle, during fertilization pollen tubes enter the ovule through an opening called a micropyle. So, the ovule is an integument megasporangium.

> Megasporophyll is equivalent to the carpel of the angiosperms.

> In angiosperms, carpel is produced by rolling megasporophyll.

> Megasporangium is the nucellus in angiosperms.

Hence, the correct answer is option (C).

Additional information:
- The ovule is composed of three parts, an integument that forms its outer layer, the nucellus, and the female gametophyte (that is formed from a haploid megaspore) in its center.
- The nucellus is the largest part of the ovule, the integument is the tough protective layer and the female gametophyte is part that contains gamete producing sex organs, which are necessary for sexual reproduction.
- In angiosperms, ovules are found in the ovary within the carpel and have two typical integuments.
- In gymnosperms, they are found on the female cones and usually have one integument.

Note: The ovule is an organ that develops into the seed after fertilization. The ovule is the part where reproductive cells are made and contained. After fertilization the ovule begins to swell and its wall toughens up and prepares itself to become a seed. Ovule with its integuments is Megasporangium. The integument is the outer tough protective layer. The largest part of the ovule is the nucleus; it provides space for the embryo sac as well as nutritive tissue.