NEET 2007 Biology question

In the prothallus of vascular cryptogam, the antherozoids and eggs mature at different times. As a result:

(1)self fertilization is preventedCorrect
(2)there is no change in success rate of fertilization
(3)there is high degree of sterility
(4)one can conclude that the plant is apomictic

Answer: (1)

Solution

In homosporous pteridophytes (vascular cryptogams) the prothallus (gametophyte) is bisexual (monoecious) and bears both antheridia and archegonia. If both gametes matured together, self-fertilization would be possible. Maturation of antherozoids and eggs at different times (protandry or

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Question ID VK-089746