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Question

The chromosome number in a root cell of a plant X is 30. What would be the chromosome number in the cell of (i) endothecium, (ii) primary sporogenous cells of microsporangium, (iii) microspore?
  1. i-30, ii-30, iii-30
  2. i-30, ii-30, iii-15
  3. i-30, ii-15, iii-15
  4. i-15, ii-15, iii-15


Solution

The correct option is B i-30, ii-30, iii-15
Root cells are diploid in nature. Microspores are haploid plant spores that mature into male gametophyte in angiosperms. Hence, they will have 15 chromosomes.
Primary sporogenous cells of the microsporangium contains diploid cells. These cells form the diploid microspore mother cells.
Endothecium is a layer present in microsporangium made up of diploid cells. They will have 30 chromosomes.
 

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