Question

Match the contents of column I with column II.

	Column I		Column II
A.	Megasporophyll	(i)	Pollen grains
B.	Male gametophyte	(ii)	Embryo
C.	Female gametophyte	(iii)	Primary endosperm nucleus
D.	Triple fusion	(iv)	Female strobili
E.	Syngamy	(v)	Embryo sac

• A. A- (i), B- (ii), C- (iii), D- (iv), E- (v)
• B. A- (i), B- (iv), C- (v), D- (ii), E- (iii)
• C. A- (iv), B- (i), C- (ii), D- (v), E- (iii)
• D. A- (iv), B- (i), C- (v), D- (iii), E- (ii)

Answer 1

The correct option is D A- (iv), B- (i), C- (v), D- (iii), E- (ii)

1. Megasporophyll is the female strobili which bear megasporangium. Megasporangium or ovule arises from the placenta which is the tissue in the ovarian cavity. Megasporangium is stalked and attached to the placenta by means of a stalk called funicle. Megasporangium is the female reproductive unit in plants.
   
2. Pollen grains are the male gametophyte. They develop from pollen mother cell by meiotic division. Pollen grains are generally spherical in nature. They possess two prominent layered walls-outer exine and inner intine. They contain male gametes for sexual reproduction.
   
3. Embryo sac is the female gametophyte. It is located within the nucellus of megasporangium. The cells with high or abundant reserve food material enclosed within integument are called nucellus. Embryo sac is the site for triple fusion.
   
4. Triple fusion is the fusion of one male gamete and two polar nuclei (or secondary nucleus; if the two have already fused) in the central cell of embryo sac to form primary endosperm nucleus. It takes place in the central cell of an embryo sac. Three nuclei are involved in triple fusion, i.e., one male nucleus and two polar nuclei in the central cell.
   
5. Syngamy is the fusion of male and female gametes to form a diploid cell called zygote. Zygote further develops into the embryo. Syngamy is also known as fertilization. It is of two types, i.e., external fertilization and internal fertilization. Thus, the correct answer is option D.