Bryophytes are dependent on water because [CBSE PMT 1998]
A) Archegonium has to remain filled with water for fertilization
B) Water is essential for fertilization for their homosporous nature
C) Water is essential for their vegetative propagation
D) The sperms can easily reach upto egg in the archegonium
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Bryophytes are dependent on water because the sperms can easily reach upto egg in the archegonium.
Option D
Explanation:
- Archegonium of the bryophytes are the female reproductive structures whereas the antheridium are the male reproductive parts.
- The bryophytes are the plants that can undergo both sexual and asexual mode of reproduction.
- In case of sexual reproduction of bryophytes, the sperm that is secreted by the antheridium are given out in the water.
- These sperms are floating in water and by means of chemotactic movements they are attracted towards the archegonium.
- The archegonium has a opening which is guarded by different types of cells and the sperm enters the hollow pore, for fertilization to occur. This is why water is necessary.
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