CUET · BIOLOGY · PYQ PAPER 2023

Which of the following is always upright in an ecosystem?

A Pyramid of biomass
B Pyramid of energy
C Pyramid of numbers
D Food web

Verified Solution

Answer & Solution

Correct Answer

(B) Pyramid of energy

Step-by-step Solution

Detailed explanation

Pyramid of energy

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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SAMPLE-1 SAMPLE-2
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List - I	List - II
(A) Salmonella typhimurium	(I) Thermostable DNA polymerase
(B) Thermus aquaticus	(II) First recombinant DNA
(C) Bacteriophage	(III) Cry protein
(D) Bacillus thuringiensis	(IV) Cloning vector

	SAMPLE-1	SAMPLE-2
sample size	8	10
sample mean	191	199
sample standard deviation	10	12