Q. No.Match List-I with List-II:
Choose the correct answer from the options given below.
| List-I | List-II | ||
| A. | Productivity | I. | Cross primary productivity minus respiration losses |
| B. | Net primary productivity | II. | Rate of formation of new organic matter by consumers |
| C. | Cross primary productivity | III. | Rate of biomass production |
| D. | Secondary productivity | IV. | Rate of production of organic matter during photosynthesis |
Choose the correct answer from the options given below.
| 1. | A-I, B-II, C-III, D-IV |
| 2. | A-III, B-I C-IV D-II |
| 3. | A-III, B-I, C-II, D-IV |
| 4. | A-I, B-III, C-IV, D-II |
Subtopic: Ecosystem Productivity |
78%
Level 2: 60%+
NEET - 2026
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Hints
Please attempt this question first.
Which of the following is the unit of productivity of an ecosystem?
1. \(\mathrm{KCal} \mathrm{~m}^{-3} \)
2. \(\left(\mathrm{KCal} \mathrm{~m}^{-2}\right) \mathrm{yr}^{-1} \)
3. \(\mathrm{gm}^{-2}\)
4. \(\mathrm{KCal} \mathrm{~m}^{-2}\)
1. \(\mathrm{KCal} \mathrm{~m}^{-3} \)
2. \(\left(\mathrm{KCal} \mathrm{~m}^{-2}\right) \mathrm{yr}^{-1} \)
3. \(\mathrm{gm}^{-2}\)
4. \(\mathrm{KCal} \mathrm{~m}^{-2}\)
Subtopic: Ecosystem Productivity |
79%
Level 2: 60%+
NEET - 2025
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Hints
Please attempt this question first.
Given below are two statements:
In the light of the above statements, choose the most appropriate answer from this options given below.
| Statement I: | The primary source of energy in an ecosystem is solar energy. |
| Statement II: | The rate of production of organic matter photosynthesis in an ecosystem is called net primary productivity (NPP). |
| 1. | Statement I is correct but statement II is incorrect |
| 2. | Statement I is incorrect but statement II is correct |
| 3. | Both statement I and statement II are correct |
| 4. | Both statement I and statement II are incorrect |
Subtopic: Ecosystem Productivity | Energy Flow |
65%
Level 2: 60%+
NEET - 2025
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Hints
Please attempt this question first.
In an ecosystem, if the Net Primary Productivity (NPP) of first trophic level is \(100 x\left(\mathrm{kcal} ~\mathrm{m}^{-2}\right) \mathrm{yr}^{-1},\) what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?
| 1. | \(x\left(\mathrm{kcal}~ \mathrm{m}^{-2}\right) y r^{-1}\) |
| 2. | \(10 x\left(\mathrm{kcal} ~\mathrm{m}^{-2}\right) \mathrm{yr}^{-1}\) |
| 3. | \(\dfrac{100 x}{3 x}\left(\mathrm{kcal} ~\mathrm{m}^{-2}\right) \mathrm{yr}^{-1}\) |
| 4. | \(\dfrac{x}{10}\left(\mathrm{kcal} ~\mathrm{m}^{-2}\right) y r^{-1}\) |
Subtopic: Ecosystem Productivity | Energy Flow |
Level 3: 35%-60%
NEET - 2024
Hints
In the equation
GPP is Gross Primary Productivity. NPP is net Primary Productivity. R here is ___________
1. Reproductive allocation
2. Photosynthetically active radiation
3. Respiratory quotient
4. Respiratory loss
GPP is Gross Primary Productivity. NPP is net Primary Productivity. R here is ___________
1. Reproductive allocation
2. Photosynthetically active radiation
3. Respiratory quotient
4. Respiratory loss
Subtopic: Ecosystem Productivity |
89%
Level 1: 80%+
NEET - 2023
Hints
The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is called:
1. Secondary production
2. Primary production
3. Gross primary production
4. Net primary production
1. Secondary production
2. Primary production
3. Gross primary production
4. Net primary production
Subtopic: Ecosystem Productivity |
56%
Level 3: 35%-60%
NEET - 2022
Hints
In the equation GPP – R = NPP, R represents:
1. Environment factor
2. Respiration losses
3. Radiant energy
4. Retardation factor
Subtopic: Ecosystem Productivity |
94%
Level 1: 80%+
NEET - 2021
Hints
The mass of living material at a tropic level at a particular time is called:
1. gross primary productivity
2. standing state
3. net primary productivity
4. standing crop
2. standing state
3. net primary productivity
4. standing crop
Subtopic: Ecosystem Productivity |
75%
Level 2: 60%+
NEET - 2015
Hints
In an ecosystem, the rate of production of organic matter during photosynthesis is termed as:
1. net primary productivity
2. gross primary productivity
3. secondary productivity
4. net productivity
Subtopic: Ecosystem Productivity |
80%
Level 1: 80%+
NEET - 2015
Hints
Links
Secondary productivity is the rate of formation of new organic matter by:
1. Parasite
2. Consumer
3. Decomposer
4. Producer
Subtopic: Ecosystem Productivity |
86%
Level 1: 80%+
AIPMT - 2013
Hints
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