Which one of the following is a matching pair of an animal and a certain phenomenon it exhibits :
A
Pheretima – Sexual dimorphism
B
Musca – Complete metamorphosis
C
Chameleon – Mimicry
D
Taenia – Polymorphism
The answer is B.
Solution
Musca (housefly) shows complete metamorphosis (holometaboly): egg, larva (maggot), pupa and adult are distinct stages. Correctly matched. Pheretima (earthworm) is hermaphrodite (bisexual), so there is no sexual dimorphism. Chameleon changes its colour to match the background, which is camouflage (protective colouration) rather than mimicry of another species. Polymorphism (different forms of individuals in one species, e.g. polyps and medusae) is a feature of cnidarians such as Obelia, not Taenia. So the matching pair is Musca – complete metamorphosis.
ConceptComplete metamorphosis in housefly
Animal Kingdom in past papers
123 questions from this chapter have appeared across 27 exam years.
