Question

1. The male and female gametes in angiosperms are produced in the ...$a$... and ...$b$..., respectively.

2. In angiosperms, both male and female gametes are...$c$..., they have to be brought together for ...$d$... to occur. The ...$e$... is the mechanism to achieve this objective.

• A.
  $a$-generative cell , $b$-nucellus, $c$-non motile, $d$-pollination, $e$-fertilisation
• B.
  $a$-pollen grain, $b$-embryo sac, $c$-motile, $d$-pollination, $e$-fertilisation
• C.
  
  $a$-Pollen grain , $b$-embryo sac, $c$- non-motile, $d$-fertilisation ,$e$-pollination
  
• D.
  
  $a$-Pollen grain , $b$-embryo sac, $c$-motile, $d$-fertilisation ,$e$-pollination
  

Answer 1

The correct option is C


$a$-Pollen grain , $b$-embryo sac, $c$- non-motile, $d$-fertilisation ,$e$-pollination

Male and female gametes
Two male gametes are produced within each of the haploid male gametophytes, i.e., the mature pollen grain of angiosperms by mitotic division of the microspores. The female gamete or egg cell is produced within the haploid female gametophyte or embryo sac by mitotic divisions of the haploid functional megaspore.

Fertilisation
1.The pollen grain carrying the male gamete and the egg cell (female gamete) are non-motile.
2.But for sexual reproduction to occur, the male and female gametes must fuse to form a diploid zygote by the process of fertilisation.
3.Thus the pollen grains have to be transferred to the female gametophyte by external agents such as wind, water, insects, etc.
4.Upon reaching the stigma of the female reproductive organ, the pollen tube is developed from pollen grains to transport male gametes to the embryo sac for fusion with the egg cell and central cell.
5.Fusion with the egg cell results in the formation of a zygote that grows into a new plant.

Pollination
The transfer of the pollen grain from the anther of the flower to the stigma of the flower occurs via the process of pollination which is carried out by agents such as wind, water, insects, etc.