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in prothalus of vascular cryptogams,egg and antherozids mature at different times as a result a)there is high degree of sterility b)self fertilisation can be prevented

in prothalus of vascular cryptogams,egg and antherozids mature at different times as a result
a)there is high degree of sterility
b)self fertilisation can be prevented

Grade:12th pass

5 Answers

dhanush
29 Points
4 years ago
self fertilisation can be prevented..............................................option (b) is correct
 
sourav
15 Points
4 years ago
self fertilisation can be prevented as most of the pteridophytes(prothallus is the gametophytic generation of pteridophytes) are homosporous(eg:adiantum,pteris).
hence option b is correct
but if we consider the heterosporous nature of pteridophytes(eg:selaginella,salvinia,azolla,marsilea)
then option a is correct.
sourav
15 Points
4 years ago
 
but if we consider the heterosporous nature of pteridophytes(eg:selaginella,salvinia,azolla,marsilea)
then option a is correct.
sourav
15 Points
4 years ago
 
asdfs fdasffa dsaf saf..........................................................sadfsfsdfdstrawesgfds  option a is correct.
Shivam jha
105 Points
4 years ago
Hello Criptogams means flower that never open so it is fixed that in this only self fertilization occur so that only thing rest the gamet wait for maturation or the flower may be sterile

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