Question

explain the stages involved in maturation of microscope into a pollen grain

Answer 1

The stages involved in the maturation of microspore into a pollen grain is as follows:

  In flowering plants the pollen grains are formed inside the anther.The cells present in  the pollen sacs are called microspore mother cells also called as microsporocyte. This microspore is diploid. The microspore mother cell will divide by meiosis,which results in the formation of 4 microspores. The microspores are now called as the tetrad(because they are in cluster of 4).Each of these microspores are now haploid.These microspores further divide once by mitosis to form 2 celled microspore. Each of these microspore then further gets differentiated into a pollen grain by developing a thick wall around it.

           

           

               

         

           

Answer 2

The stages involved in the maturation of Microspore into a pollen grain are MICROSPOROGENESIS, ARRANGEMENT INTO TETRAD, MITOTIS AND ROUNDING OFF OF POLLEN.

1. MICROSPOROGENESIS - reductional division occurs in the MICROSPORE MOTHER CELL to give rise to "4" Microspores.

2. ARRANGEMENT INTO A TETRAD - these microspores are then arranged into a TETRAD shape and further form different wall layers around them.

3. MITOTIS - now mitosis occurs inside the microsporangium to form many microspores or pollen grains.

4. ROUNDING OFF - these microspores now known as pollen grains undergo rounding, to get a circular shape and are then released in the atmosphere at the time of dehiscence.