MHT CET · BIOLOGY · STD 12 - 9. Control and Coordination

Which of the following statements is INCORRECT?

A Ependymal cells lining the central canal of the spinal cord produce CSF.
B White matter of CNS contains myelinated nerve fibres.
C Axon is single, long process of a neuron and contains neurofibrils.
D Astrocytes mediate immune response in the CNS.

Verified Solution

Answer & Solution

Correct Answer

(D) Astrocytes mediate immune response in the CNS.

Step-by-step Solution

Detailed explanation

Astrocytes have varied roles in the brain, secretion, and absorption of neural transmitter and maintenance of blood-brain barrier BBB. Regulate the transmission of electrical impulses with the brain.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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