12th Class Biology Reproduction In Organisms

  • question_answer 84)
      The number of chromosomes in the shoot tip cells of a maize plant is 20.The number of chromosomes in the microspore mother cells of the same plant shall be (a) 20                                     (b)10                                     (c)40                                      (d) 15

    Answer:

                      (a)The whole plant body of maize plant including shoot tip cells remains in diploid (2n)condition. As the microspore mother cell is a part of reproductive organ, the chromosome number in these cells will remain same as the individual. i.e., 2n=20.These microspore mother cells are further responsible for producing male gametes ,i.e., haploid (n) by reduction division.


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