CUET · BIOLOGY · PYQ PAPER 2023

'Barnacles' growing on the back of whale is a classical example of :

A Mutualism
B Predation
C Amensalism
D Commensalism

Verified Solution

Answer & Solution

Correct Answer

(D) Commensalism

Step-by-step Solution

Detailed explanation

Commensalism

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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From CUET

Match List I with List II

List I (Terms)	List ll (Features)
(A) AlIele	(I) The position on the chromosome where a gene occurs
(B) Locus	(II) Testing a suspected heterozygote by crossing it with a known homozygous recessive
(C) Gene	(III) One of two or more alternative nucleotide sequences at a single gene locus
(D) Test Cross	(IV) A length of DNA that codes for a particular polypeptide or protein

Choose the correct answer from the options given below:

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LIst - I		LIst - II
Species A	Species B	Name of Interaction
(A) +	+	(I) Competition
(B) +	-	(II) Mutualism
(C) -	-	(III) Amensalism
(D) -	0	(IV) Predation

LIST I	LIST II
(A) Human skin colour	(I) Incomplete dominance
(B) ABO blood groups	(II) Polygenic inheritance
(C) Snapdragon	(III) Parthenogenesis
(D) Male honeybee	(IV) Multiple allelism