Question

The winged pollen grain of Pinus are produced in
A. Pollen chamber
B. Anther
C. Tapetum
D. Microsporangium

Answer 1

Hint: A structure in the plant of the gymnosperms where the microspore is produced and it also undergoes division to produce male gamete cells that later help in the process of pollination.

Complete answer:
The winged pollen grain of Pinus is produced in microsporangium. Microsporangium produces spores which later will form male gametophyte at the time of germination. It occurs in the vascular plants where different male and female sporophytes are produced.

Additional Information: -The characteristic feature of Pinus and few Pinaceae members is the presence of winged pollen grains.
-The pollen has outer exine which is extended on both the two lateral sides giving rise to the wings of pollen.
-The winged pollen brought buoyancy because of the presence of sacs.
-The wings of the pollen rise upwards and float in the air.
-The pollination that occurs in Pinus is performed by the wind called anemophily.
-The pollens are not organs of flight.
-The microsporangia are present while producing microsporocytes.
-These micro sporophytes undergo meiosis to form four haploid microspores.
-Pollen grains are the male gamete that helps the plant in the process of fertilization.
-If the plant is heterotrophs then it will produce separate male and female megasporangium.

So, the correct answer is ‘Microsporangium'.

Note: Pollen grains are the powdery substance having a hard coat of sporopollenin for the protection of the gametophytes. Pollen is produced by two processes, one is vegetative (non-reproductive) cells and generative (reproductive) cells. The inner layer of the pollen is made of cellulose. The pollens in Pinus are derived from the nucleus to provide nutrition. The cavity in the ovule of the gymnosperms is called a pollen chamber where the pollens are stored. Neither is the male part (stamen) which produces pollen. Tapetum is the innermost layer of the anther and provides nutrition to the pollen.