|
The ova of the earthworms are fertilised by the sperm within the |
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|
a) |
Cocoon |
b) |
Seminal vesicles |
c) |
Soil |
d) |
None of the above |
|
The ova of the earthworms are fertilised by the sperm within the |
|||||||
|
a) |
Cocoon |
b) |
Seminal vesicles |
c) |
Soil |
d) |
None of the above |
(a)
In Pheretima fertilization is external (outside the body) within specialised structures called cocoons. These are hard shell structures containing mature sperms, egs cells and nutritive fluid. These hard structures are developed due to hardening of clitellar secretions