Q. No.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). |
In the light of the above statements, choose the most appropriate answer from this options given below.
| 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%
From NCERT
NEET - 2025
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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 |
75%
From NCERT
NEET - 2025
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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 |
51%
From NCERT
NEET - 2024
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
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 |
88%
From NCERT
NEET - 2023
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
Frugivorous birds are found in large numbers in tropical forests mainly because of :
1. lack of niche specialisation.
2. higher annual rainfall.
3. availability of fruits throughout the year.
4. temperature conducive for their breeding.
1. lack of niche specialisation.
2. higher annual rainfall.
3. availability of fruits throughout the year.
4. temperature conducive for their breeding.
Subtopic: Components & Types of Ecosystems | Ecosystem Productivity |
68%
NEET - 2022
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NEET 2026 - Target Batch - Vital
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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 |
57%
From NCERT
NEET - 2022
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
In the equation GPP – R = NPP, R represents:
1. Environment factor
2. Respiration losses
3. Radiant energy
4. Retardation factor
Subtopic: Ecosystem Productivity |
93%
From NCERT
NEET - 2021
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
Which ecosystem has the maximum biomass?
1. Grassland ecosystem
2. Pond ecosystem
3. Lake ecosystem
4. Forest ecosystem
Subtopic: Ecosystem Productivity |
70%
NEET - 2017
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NEET 2026 - Target Batch - Vital
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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 |
76%
From NCERT
NEET - 2015
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
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%
From NCERT
NEET - 2015
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NEET 2026 - Target Batch - Vital
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