CUET · BIOLOGY · PYQ PAPER 2025

Which one of the given structures is not the secondary lymphoid organ?

A Spleen
B Tonsils
C Peyer's patches
D Thymus

Verified Solution

Answer & Solution

Correct Answer

(D) Thymus

Step-by-step Solution

Detailed explanation

Thymus

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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A. Lactobacillus	I. Citric acid
B. Aspergillus niger	II. Butyric acid
C. Acetobacter aceti	III. Lactic acid
D. Clostridium butylicum	IV. Acetic acid