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Question

Prothallial cells in the male gametophyte of Selaginella are/is

A
1
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B
2
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C
4
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D
8
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Solution

The correct option is A 1
  • The sporangia produce spores by meiosis in spore mother cells. The spores germinate to give rise to inconspicuous, small but multicellular. free-living, mostly photosynthetic thalloid gametophytes called prothallus.
  • These gametophytes bear male and female sex organs called antheridia and archegonia, respectively.
  • The microspore germinates to form the male gametophyte.
  • The first unequal division (1-1) in a microspore results in the formation of a small lenticular prothallial cell (vegetative cell) and a large antheridial initial. The prothallial cell does not divide further.
  • Hence, prothallial cells in the male gametophyte of Selaginella is 1.
  • So, the correct answer is '1'.

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