Question

Male gametophyte in angiosperms produces
a. Two sperms and a vegetative cell
b. Single sperm and a vegetative cell
c. Single sperm and two vegetative cells
d. Three sperms

Answer 1

Hint: The plants on the earth are generally dividing into two types, based on the production of flower, they are divided into angiosperms and gymnosperms, where the angiosperms are flower producing, seed producing and fruit producing plants, and the seeds of angiosperms contain endosperm.

Complete answer:
- In angiosperms, generally the male gametophyte completes its early development within the anther.
- Within the anther, there is sporogenous tissue, from which they produce the microsporocytes or pollen mother cells.
- Where as the microsporocytes undergo the two divisions of meiosis and transform microsporocyte cells into haploid microspores of pollen grains
- In general two cells are produced in first division, and after the second division tetrad is produced, and this microspore within the tetrad is surrounded by callose .
- The microspores which are produced by two meiotic divisions later increase very rapidly in volume and undergo a change in shape and maximum growth occur before anteiasis.
- Before they release from the anther, they undergo another division, and this is unequal to produce one vegetative cell and one generative cell.
- Generative cells normally inherit a small amount of the cytoplasm from the microspore.
- This generative cell again undergoes mitosis and produces two sperm cells.
- So finally male gametophytes produce one vegetative cell and two sperm cells.
- So the answer is two sperms and one vegetative cell.
Hence, the correct answer is option (A).

Note: In angiosperms after maturation, they produce mainly three types of cells, they are vegetative cells and two sperm cells which flow in the cytoplasm of the vegetative cells. After anthesis, the pollen sac rupture and pollen grain are free outside.