Q.51 Identify the CORRECT matching between group I and group II in relation to ecology
GROUP I
P. The physical environment of an organism
Q. The totality of the needs of a population for survival and its resource utilization
R. The position of a species in a food chain
S. Basic functional unit comprising living community and its physical environment
GROUP II
1. Trophic level
2. Habitat
3. Ecosystem
4. Niche
5. Ecological pyramid
(A) P-2, Q-5, R-4, S-1
(B) P-2, Q-4, R-1, S-3
(C) P-5, Q-2, R-3, S-1
(D) P-1, Q-3, R-4, S-2
Habitat, niche, trophic level, and ecosystem form core concepts in ecology matching questions. This article breaks down Q.51 with the correct answer and analyzes all options for clarity.
Correct Answer
The correct matching is (B) P-2, Q-4, R-1, S-3. P matches habitat (2) as the physical environment where an organism lives. Q aligns with niche (4), covering a population’s total needs and resource use. R corresponds to trophic level (1), the species’ food chain position. S fits ecosystem (3), the functional unit of biotic community and abiotic environment.
Group I and II Definitions
Habitat (2) refers to an organism’s physical surroundings, like a forest for deer or aquatic zones for fish.
Niche (4) encompasses a population’s full role, including survival needs, resource use, and interactions.
Trophic level (1) denotes a species’ position in the food chain, such as producers, herbivores, or carnivores.
Ecosystem (3) integrates living organisms with their non-living environment through energy flow and nutrient cycles.
Ecological pyramid (5) graphically shows energy, biomass, or numbers decreasing across trophic levels.
Option Analysis
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(A) P-2, Q-5, R-4, S-1: Correct for P (habitat). Wrong for Q (niche ≠ pyramid), R (trophic level ≠ niche), S (ecosystem ≠ trophic level).
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(B) P-2, Q-4, R-1, S-3: Fully correct, as each term precisely matches the ecological definitions.
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(C) P-5, Q-2, R-3, S-1: Incorrect; habitat is not a pyramid, niche not habitat, trophic level not ecosystem.
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(D) P-1, Q-3, R-4, S-2: Wrong; physical environment ≠ trophic level, niche ≠ ecosystem, etc.
Exam Preparation Tips
Master these by linking habitat to “address,” niche to “profession,” trophic level to “feeding tier,” and ecosystem to “complete system.” Practice with diagrams of food chains and pyramids for visual recall.
