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

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

Correct answer: self-fertilization is prevented

Solution

When antherozoids and eggs mature at different times, the gametes from the same prothallus cannot usually fuse with each other. This temporal separation prevents self-fertilization and promotes outcrossing.

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