Animal Kingdom Question 354
Question: Which one of the following does not have larvae in its life cycle
[Pb. PMT 1997]
Options:
A) Prawn
B) Earthworm
C) Crab
D) Cockroach
Show Answer
Answer:
Correct Answer: B
Solution:
A larva is a distinct juvenile form many animals undergo before metamorphosis into adults. Earthworm belongs to phylum Annelida, and it does not have larvae in its life cycle.
The earthworm mates and fertilizes the egg, which is held in the protective cocoon. Young one hatches from the cocoon and burrows in the soil, where it grows into a juvenile worm and finally into a mature worm.
Apart from earthworms both prawns and crabs have larval forms in their life cycle.
Prawn and crab both belong to class Crustacea and their larva is called nauplius larva.
BETA
