Question

Read the given statements and select the correct option.
(i) Synaptic cleft of neurons secretes adrenaline.
(ii) Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
(iii) Non-myelinated nerve fibre is enclosed by a Schwann cells that does not form a myelin sheath.
(iii) Spinal and cranial nerves are made of non-myelinated nerve fibres

• A. Statements (i) and (ii) are correct but statements (iii) and (iv) are incorrect
• B. Statements (i), (ii) and (iii) are correct but statement (iv) is incorrect
• C. Statements (iii) and (iv) are correct but statements (i) and (ii) are incorrect
• D. Statements (ii) and (iii) are correct but statements (i) and (iv) are incorrect

Answer 1

The correct option is D Statements (ii) and (iii) are correct but statements (i) and (iv) are incorrect

Synaptic vesicles of the synaptic knob secrete neurotransmitter. Spinal nerves and cranial nerves are myelinated nerves.