Question

Megasporangium is equivalent to
(a) Embryo sac
(b) Fruit
(c) Nucellus
(d) Ovule

Answer 1

Hint: The megasporangium in flowering plants is composed of nucellus, integuments, and funiculus through which it adheres to the placenta. When fertilization is completed, it develops into a seed.

Complete answer:
In biology, megasporangium is a technical term and is given to an ovule that contains a nucleus, integuments, and funiculus. The funiculus is a short stalk-like structure and it helps in attachment with the placenta. The integuments cover an opening which is known as micropyle and it serves as the site for the entry of pollen tubes during the fertilization in the flowering plants. There is one more structure called hilum and it attaches the main body of ovule or megasporangium to the funiculus.
Here, in the given figure it is clear that integuments are the covering of ovule. These are multicellular layers and in different types of plants, they may be single-layered, double-layered, or even consist of many layers. The nucleus is a mass of centrally located thin-walled parenchymatous cells and is covered by the integuments. Nucellus provides nutrition to the developing embryo sac or endosperm and this is the main function of cells in the nucellus.
So, the correct answer is ‘Ovule’.

Note: In the megasporangium, embryo sac lies within the nucleus cells that provide nutrition to it and help in its development. It contains the egg nucleus and other nuclei that give rise to the endosperm after completion of fertilization. The fruit is also called a ripened ovary because it develops from the ovary of a flowering plant.