NEET · Biology · STD 11 - 8. Cell the unit of life

Which of the following best illustrates "feedback" in development?

A Tissue \(X\) secretes \(RNA\) which changes the development of tissue \(Y\).
B As tissue \(X\) develops, it secretes enzymes that inhibit the development of tissue \(Y.\)
C As tissue \(X\) develops, it secretes something that induces tissue \(Y\) to develop.
D As tissue \(X\) develops, it secretes something that slows down the growth of tissue \(Y.\)

Verified Solution

Answer & Solution

Correct Answer

(C) As tissue \(X\) develops, it secretes something that induces tissue \(Y\) to develop.

Step-by-step Solution

Detailed explanation

(c) : As tissue \(X\) develops it secretes something that induces tissue \(Y\) to develop indicating positive feedback mechanism.

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.

Same subject

Nomenclature is governed by certain universal rules. Which one of the following is contrary to the rules of nomenclature?

NEET 2016 Medium

Match List \(- I\) with List \(- II.\)

List \(- I\)	List \(- II\)
(a) \(S\) phase	(i) Proteins are synthesized
(b) \(G_2\) phase	(ii) Inactive phase
(c) Quiescent stage	(iii) Interval between mitosis and initiation of \(DNA\) replication
(d) \(\mathrm{G}_{1}\) phase	(iv) \(DNA\) replication

Choose the correct answer from the options given below.\((a) -(b) -(c)- (d)\)

NEET 2021 Medium

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