NEET · Biology · STD 11 - 2. Biology classification

Select the wrong statement.

A The term "contagium vivum fluidum" was coined by M. W. Beijerinck.
B Mosaic disease in tobacco and \(AIDS\) in human being are caused by viruses.
C The viroids were discovered by D.J. Ivanowsky.
D W.M. Stanley showed that viruses could be crystallised.

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Answer & Solution

Correct Answer

(C) The viroids were discovered by D.J. Ivanowsky.

Step-by-step Solution

Detailed explanation

(c) : Viroids are infectious \(RNA\) particles which were discovered by T.O. Diener \((1971)\). These are devoid of protein coat and cause diseases in plants only, e.g., potato spindle tuber, chrysanthemum stunt etc.

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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(D)	(IV) (i) conc. \(H _2 SO _4, \triangle\); (ii) \(H ^{+} / H _2 O\)

Choose the correct answer from the options given below:

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