CUET · BIOLOGY · PYQ PAPER 2025

Identify the free living nitrogen fixing soil bacteria.

A Nostoc
B Rhizobium
C Azospirillum
D Oscillatoria

Verified Solution

Answer & Solution

Correct Answer

(C) Azospirillum

Step-by-step Solution

Detailed explanation

Azospirillum

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

Match List I with List II

LIST I	LIST II
A. Dominant trait of pod colour in garden pea	I. Polygenic traits
B. The physical association of two genes on a chromosome	II. Pleiotropy
C. The traits generally controlled by three or more genes	III. Yellow
D. When a single gene exhibit multiple phenotypic expression	IV. Linkage
	V. Green

Choose the correct answer from the options given below:

CUET 2023 Easy

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