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

Arrange the following in the correct sequence in evolution of nervous system.
(a) Formation of centralised nervous system.
(b) Diffused nervous system in Hydra.
(c) Formation of ganglion.
(d) Nervous system is lacking in sponges.

A (d), (b), (c) and (a)
B (a), (d), (b), and (a)
C (b), (a), (d) and (c)
D (c), (d), (a), and (b)

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Answer & Solution

Correct Answer

(A) (d), (b), (c) and (a)

Step-by-step Solution

Detailed explanation

Porifera being most primitive lack nervous tissues. As we move to higher organization nervous system is developed for smooth inernal functioning and also to respond, co-ordinate with respect to changes and stimuli in external environment.

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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Arrange the following in the correct sequence in evolution of nervous system.(a) Formation of centralised nervous system.(b) Diffused nervous system in Hydra.(c) Formation of ganglion.(d) Nervous system is lacking in sponges.

Step-by-step Solution

Arrange the following in the correct sequence in evolution of nervous system.
(a) Formation of centralised nervous system.
(b) Diffused nervous system in Hydra.
(c) Formation of ganglion.
(d) Nervous system is lacking in sponges.