NEET · Biology · STD 12 - 11. organisms and populations

The following graph depicts changes in two populations \((A\) and \(B)\) of herbivores in a grassy field. \(A\) possible reason for these changes is that

A population \(A\) produced more offspring than population \(B\)
B population \(A\) consumed the members of population \(B\)
C both plant populations in this habitat decreased
D population \(B\) competed more successfully for food than population \(A\)

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Answer & Solution

Correct Answer

(D) population \(B\) competed more successfully for food than population \(A\)

Step-by-step Solution

Detailed explanation

(d) : Both the populations are herbivorous, thus they cannot affect each other. If the food sources for these populations \(A\) and \(B\) have decreased, then both the populations \(A\) and \(B\) would have declined. If population \(A\) have produced more offspring then the graph \(A\) should have increased. Based on the graph, population \(B\) is more successful in competing with population \(A\), that is why number of organisms in population \(B\) increased while that in population \(A\) decreased, as they get access to limited resources.

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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Seed formation without fertilisation in flowering plants involves the process of

NEET 2016 Medium

Match List \(-I\) with List \(-II\) :

List \(-I\)	List \(-II\)
\(a\) In lac operon \(i\) gene codes for	\(i\) transacetylase
\(b\) In lac operon \(z\) gene codes for	\(ii\) permease
\(c\) In lac operon \(y\) gene codes for	\(iii\) \(\beta\) - galactosidase
\(d\) In lac operon \(a\) gene codes for	\(iv\) Repressor

Choose the correct answer from the options given below :

NEET 2022 Medium

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