Match List-I with List-II.
| List-I (Term) | List-II (Description) |
| A. Primary consumers | I. Rate of production of organic matter during photosynthesis |
| B. Secondary consumers | II. Mass of living material at a trophic level at a particular time |
| C. Standing crop | III. Herbivores that feed on the producers |
| D. Gross primary productivity | IV. Primary carnivores that feed on the herbivores |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → A-III, B-IV, C-II, D-I
(A) Primary consumers — this matches (III) Herbivores that feed on the producers. Animals that eat plants are the first level of consumers.
(B) Secondary consumers — this matches (IV) Primary carnivores that feed on the herbivores. They are the first carnivores in the chain but the second level of consumers.
(C) Standing crop — this matches (II) Mass of living material at a trophic level at a particular time. It is measured as biomass or as the number of organisms in a unit area.
(D) Gross primary productivity — this matches (I) Rate of production of organic matter during photosynthesis. GPP minus the loss in respiration gives the net primary productivity (NPP).
NCERT Extract:
Energy Flow – “… If they feed on the producers, the plants, they are called primary consumers, and if the animals eat other animals which in turn eat the plants (or their produce) they are called secondary consumers. Likewise, you could have tertiary consumers too. Obviously the primary consumers will be herbivores. … The consumers that feed on these herbivores are carnivores, or more correctly primary carnivores (though secondary consumers).”
Energy Flow – “… Each trophic level has a certain mass of living material at a particular time called as the standing crop. The standing crop is measured as the mass of living organisms (biomass) or the number in a unit area.”
Productivity – “… Gross primary productivity of an ecosystem is the rate of production of organic matter during photosynthesis. A considerable amount of GPP is utilised by plants in respiration.”