SCIENCE
ZOOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
dioecious
|
|
|
hermaphroditic / monoecious
|
|
|
asexual
|
|
|
None of the above
|
Detailed explanation-1: -Earthworms and Nereis are monoecious and dioecious, respectively. Monoecious organisms have both male and female reproductive organs in the same individual. They are also known as hermaphrodites.
Detailed explanation-2: -Solution : [c] Nereis is dioecious but earthworms and leeches are monoecious.
Detailed explanation-3: -Earthworms are hermaphrodites and have two pairs of testes surrounded by testes sac, ovaries and ovipores. During copulation sperms are exchanged between two worms and stored. Reproduction takes place after copulation. Leeches are also hermaphrodites with both male and female reproductive organs.
Detailed explanation-4: -Nereis, which is an aquatic animal, is dioecious. Earthworm and leech are monoecious as both male and female sex organs are seen in a single individual.
Detailed explanation-5: -All leeches are hermaphrodites, showing either protandry or cosexuality (Davies and Singhal, 1988), with reciprocal cross-fertilization as the general rule.