Match List-I with List-II:
| List-I | List-II |
| A. Standing crop | I. Rate of formation of new organic matter by consumers |
| B. Detritus | II. Dead plant remains such as leaves, bark and flowers, and dead remains of animals |
| C. Secondary productivity | III. Mass of living material at a trophic level at a particular time |
| D. Net primary productivity | IV. Gross primary productivity minus respiration losses |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → A-III, B-II, C-I, D-IV
(A) Standing crop — this matches (III) Mass of living material at a trophic level at a particular time. It is measured as the biomass or the number of organisms in a unit area.
(B) Detritus — this matches (II) Dead plant remains such as leaves, bark and flowers, and dead remains of animals. Detritus is the raw material for decomposition.
(C) Secondary productivity — this matches (I) Rate of formation of new organic matter by consumers. Primary productivity belongs to the producers; secondary productivity belongs to the consumers.
(D) Net primary productivity — this matches (IV) Gross primary productivity minus respiration losses. Plants use part of their gross production in respiration, and what is left (GPP – R = NPP) is available to herbivores and decomposers.
NCERT Extract:
Energy Flow – “… Organisms at each trophic level depend on those at the lower trophic level for their energy demands. Each trophic level has a certain mass of living material at a particular time called as the standing crop.”
Decomposition – “… Dead plant remains such as leaves, bark, flowers and dead remains of animals, including fecal matter, constitute detritus, which is the raw material for decomposition.”
Productivity – “… A considerable amount of GPP is utilised by plants in respiration. Gross primary productivity minus respiration losses (R), is the net primary productivity (NPP). GPP – R = NPP Net primary productivity is the available biomass for the consumption to heterotrophs (herbiviores and decomposers). Secondary productivity is defined as the rate of formation of new organic matter by consumers.”