Question

The ovule of an angiosperm is technically equivalent to
A. Megaspore mother cell
B. Megaspore
C. Megasporangium
D. Megasporophyll

Answer 1

Hint:-Ovules are the structures which develop into the seed after fertilization. It contains the embryo enclosed within them. The ovules are enclosed within another structure called the ovary, which transforms into fruit at a later stage.

Complete Answer:-Ovules are immature seeds which are equivalent to the megasporangium. It consists of integument, which is further divided into two parts, including outer integument and the inner integument. Inside the integument, the part is referred to as nucellus, in which the development of female gametophyte or embryo sac occurs. Each ovule consists of a stalk-like structure called funicle; a part helps with its attached to the ovary. Apart from this, ovules have a small opening or hole-like structure at the apex, which is known as the micropyle.

The male gametophyte or pollen tube enters the ovule through this opening, and thereby, releases the pollens or male gametes into the embryo sac for the fertilization to occur. The embryo sac is a sac-like structure comprising seven cells and eight nuclei. The female gamete or egg is enclosed within the embryo sac.
Technically, the ovule of an angiosperm is referred to as the megasporangium.

Additional information: Based on the position of micropyle and curvature of funicle, ovules are classified into different categories, including anatropous, orthotropous, amphitropous, campylotropous. In anatropous ovule, the body of the ovule is completely inverted such that the micropyle is present adjacent to the funicle. It is the most common type of ovule found in angiosperms. In orthotropous, the ovule is erect with chalaza, hilum and micropyle in one straight line. In amphitropous ovules, the curvature is very prominent, and the embryo sac is also curved. In campylotropous, the body of the ovule is curved, and the chalaza and micropyle do not lie in a straight line.


The correct answer is option C, which represents ‘Megasporangium’

Note:- The ovule appears to be the megasporangium with integuments surrounding it and the female gamete enclosed within. After maturation, the ovule consists of a food tissue covered by one or two protective coverings (integuments), which are the future seed coats.