The 13-celled male gametophyte of Selaginella shows [CMC Vellore 1993; CPMT 1999; BHU 2001; AIIMS 2001; BHU 2003]
A) 8 cells of the antheridium + 5 prothallial cells
B) 9 cells of the antheridium + 4 prothallial cells
C) 10 cells of the antheridium + 3 prothallial cells
D) 8 jacket cell + 4 androgonial + 1 prothallial cells
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The 13-celled male gametophyte of Selaginella shows 10 cells of the antheridium + 3 prothallial cells
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Answer:
12 cells of antheridium + 1 prothalial cell
Explanation:
➡️Microspores of Selaginella are haploid in nature.
➡️Each microspore divides by mitosis division and forms a small lens shaped prothallial cell and a large antheridial cell.
➡️Subsequent division only occur in antheridial cell which result of a 12 celled antheridium in which outer 8 cells form jacket of antheridium and inner 4 cells form primary androgonal cells.
➡️Thus mature microgametophyte contains 12 antheridial cells and 1 prothallial cell.
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