Looking for classes? Ksquare Career Institute, Bengaluru →
Which one of the following pairs of items correctly belongs to the category of organs mentioned against it?
A
Nephridia of earthworm and malpighian tubules of cockroach - Excretory organs
B
Wings of honeybee and wings of crow - Homologous organs
C
Thorn of Bougainvillea and tendrils of Cucurbita - Analogous organs
D
Nictitating membrane and blind spot in human eye - Vestigial organs
Detailed Solution
Nephridia are the excretory organs of the earthworm, and Malpighian tubules are the excretory organs of the cockroach. Both remove nitrogenous wastes, so this pair correctly belongs to the category of excretory organs.
Wings of a honeybee and wings of a crow have different origins and structures but perform the same function of flight, so they are analogous organs, not homologous.
Thorn of Bougainvillea and tendrils of Cucurbita have the same origin (both are modified axillary buds) but different functions, so they are homologous organs, not analogous.
The nictitating membrane (plica semilunaris) is a vestigial organ in the human eye, but the blind spot is not vestigial; it is the functional point where the optic nerve leaves the retina.
So the correctly matched pair is nephridia of earthworm and Malpighian tubules of cockroach - Excretory organs.
Wings of a honeybee and wings of a crow have different origins and structures but perform the same function of flight, so they are analogous organs, not homologous.
Thorn of Bougainvillea and tendrils of Cucurbita have the same origin (both are modified axillary buds) but different functions, so they are homologous organs, not analogous.
The nictitating membrane (plica semilunaris) is a vestigial organ in the human eye, but the blind spot is not vestigial; it is the functional point where the optic nerve leaves the retina.
So the correctly matched pair is nephridia of earthworm and Malpighian tubules of cockroach - Excretory organs.