NEET · Biology · STD 11 - 10. Cell cycle and cell division

Select the incorrect statement with reference to mitosis:

A Spindle fibres attach to centromere of chomosomes.
B Chromosomes decondense at telophase.
C Splitting of centromere occurs at anaphase.
D All the chromosomes lie at the equator at metaphase.

Verified Solution

Answer & Solution

Correct Answer

(A) Spindle fibres attach to centromere of chomosomes.

Step-by-step Solution

Detailed explanation

Spindle fibers do not attach directly to the centromere. Instead, they attach to small disc-shaped structures on the surface of the centromeres called kinetochores. So, option (A) is incorrect reference to mitosis.

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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Match List-I with List-II

List-I (Electromagnetic wave)	List-II (Production)
(A) Microwave	(I) Electrons in atoms emit light when they move from a higher energy level to a lower energy level
(B) Visible light	(II) Radioactive decay of nucleus
(C) Gamma rays	(III) Vibration of atoms and molecules
(D) Infra-red rays	(IV) Klystron valve or magnetron valve

Choose the correct answer from the options given below:

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