Question

Select the odd one in the following series:
(i) Retina, Sclera, Ciliary body, Nephron.
(ii) Endolymph, Tympanic membrane, Semi-circular canal, Blind spot.
(iii) Prosencephalon, Mesencephalon, Rhombencephalon, Myelin.
(iv) Cerebellum, Medulla oblongata, Olfactory lobe.
(v) Parasympathetic, Sympathetic, Cranial nerve.

Answer 1

(i) Nephron
The retina, sclera and ciliary body are parts of the eye, whereas the nephron is not.

(ii) Blind spot
The endolymph, tympanic membrane and semi-circular canal are parts of the ear, whereas the blind spot is a part of the eye.

(iii) Myelin
The prosencephalon, mesencephalon and rhombencephalon are parts of brain, whereas myelin is the layer that surrounds the axon.

(iv) Olfactory lobe
The cerebellum and medulla oblongata are parts of the hindbrain, whereas the olfactory lobe is a part of the forebrain.

(v) Cranial nerve
The parasympathetic and sympathetic nervous systems are two systems that form the autonomous nervous system, whereas the cranial nerve is a part of the peripheral nervous system.