CUET · BIOLOGY · PYQ PAPER 2025

In a typical test cross:

A An organism (pea plant) showing dominant phenotype is crossed with the dominant parent.
B An organism (pea plant) showing recessive phenotype is crossed with dominant parent to determine its phenotype.
C An organism (pea plant) showing dominant phenotype is self-crossed to determine its genotype.
D An organism (pea plant) showing a dominant phenotype is crossed with a recessive parent to determine its genotype.

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Answer & Solution

Correct Answer

(D) An organism (pea plant) showing a dominant phenotype is crossed with a recessive parent to determine its genotype.

Step-by-step Solution

Detailed explanation

An organism (pea plant) showing a dominant phenotype is crossed with a recessive parent to determine its genotype.

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 (Differential equation)	List-II (Order and degree)
(A) \(\left(y^{\prime \prime}\right)^3+\left(y^{\prime}\right)^4-6=\left(y^{\prime \prime \prime}\right)^2\)	(I) Order \(=1\), Degree = 2
(B) \(\sqrt{\left(y^{\prime}\right)^2+5}=y^{\prime \prime}\)	(II) Order \(=2\), Degree = 3
(C) \(\left(y^{\prime}\right)^2=\left(2+y^{\prime \prime}\right)^{3 / 2}\)	(III) Order \(=2\), Degree = 2
(D) \(y=x y^{\prime}+\sqrt{a^2\left(y^{\prime}\right)^2+b^2}\)	(IV) Order \(=3\), Degree = 2

Choose the correct answer from the options given below :

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