Assertion : All motor neurons are efferent neurons.

Reason : Motor neurons conduct nerve impulses from the spinal cord to the brain.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false.

• If both assertion and reason are false

Given is the diagrammatic representation of the sectional view of cochlea. Select the correct option regarding it.

• A - Organ of corti-responsible for maintenance of balance of the body and posture.

• B- Scala vestibuli-filled with perilymph that ends at the oval window.

• C- Scala tympani-terminates at the round window which opens to the middle ear.

• D- Basilar membrane - nerve impulses are generated against it.

Assertion: The optic nerves leave the eye at the point called blind spot.

Reason: Only cone are densely packed at the blind spot, hence is the name.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Which of the following is correctly labelled

• A: Reissner's membrane

• B: Scala vestibuli

•  C : Basilar membrane

• D: Tectorial membrane

The release of chemical messenger from synaptic vesicles is under the influence of these ion(s).

• Cl^- 

• Fe and S²⁺

• Ca²⁺

• Mg²⁺ and Sr²⁺

Assertion: Mylein sheath insulates the nerve fibre and prevents its depolarisation.

Reason: Nerve impulses are conducted more rapidly in non - myelinated nerve fibres than in myelinated ones.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false

Which of the following is true for the function disease in family A and B? of labelled parts in the diagram below?

• A - Blind spot - Image is formed here

• B - Fovea - No visual activity is present

• C - Cornea - Helps to hold lens in place

• D - Iris - Visible coloured portion of eye

Assertion : Corpus callosum connects the two cerebral hemispheres.

Reason : Association areas are responsible for complex functions like intersensory association of memory and communication.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are hue but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : Auditory ossicles are small bones present in the cavity of inner ear.

Reason : Auditory ossicles maintain the balance of air pressure between two sides of ear drum.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false

• If both assertion and reason are false.

80.

Which of the following nerves arises from organ of Corti?

• Olfactory nerve

• Cochlear nerve

• Abducens nerve

• None of these