Question

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 cockroaches - 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

Answer 1

The correct option is A Nephridia of earthworm and malpighian tubules of cockroaches - Excretory organs

Nephridia of earthworm and malpighian tubules of cockroaches - Excretory organs Option A is where the organs are correctly matched with its category.
The thorns of bougainvillea and tendrils of Cucurbita origin from the stem and are modified from the auxiliary buds but their functions are different. - They are homologous organs. Wings in flying animals like bats, birds, and insects, fins in animals like penguins and fish are analogous organs.
Nictating membrane is a whitish or translucent membrane that forms an inner eyelid in birds, reptiles, and some mammals. It can be drawn across the eye to protect it from dust and keep it moist. The plica semilunaris in humans is a small fold of tissue on the inside corner of the eye. It is the vestigial remnant of the nictitating membrane, an organ that is fully functional in other species of mammals. It's associated muscles are also vestigial. But the blind spot in humans is not an organ. Blind spot, a is small portion of the visual field of each eye that corresponds to the position of the optic disk (also known as the optic nerve head) within the retina. There are no photoreceptors (i.e., rods or cones) in the optic disk, and, therefore, there is no image detection in this area.