Given below are two statements:
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 |
 64%
From NCERT
NEET - 2025
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Given below are two statements:
Statement I: In ecosystem, there is unidirectional flow of energy of sun from producers to consumers.
Statement II: Ecosystems are exempted from 2nd law of thermodynamics.

In the light of the above statements, choose the most appropriate answer from the 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:  Energy Flow |
 62%
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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Consider the pyramid of energy of an ecosystem given below :

If \(\text T_4\) is equivalent to \(1000~\text J,\) what is the value of T1?
1. \(\dfrac{ 1000 }{10}~\text J\) 2. \(\dfrac{ 1000}{10} \times 4~\text J \)
3. \(10,000~\text J\) 4. \(10,00,000~\text J \)
Subtopic:  Energy Flow |
 89%
From NCERT
NEET - 2024
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Mass of living matter at a tropic level in an area at any time is called:
1. Detritus 2. Humus
3. Standing state 4. Standing crop
Subtopic:  Energy Flow | Ecological Pyramids |
 87%
From NCERT
AIPMT - 2011
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Of the total incident solar radiation, proportion of PAR is:
1.  about 60%
2.  about 50%
3.  more than 80%
4.  about 70%
Subtopic:  Energy Flow |
 90%
From NCERT
AIPMT - 2011
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Percentage of energy transferred to the higher tropic level in a food chain is:

1. 1% 2. 10%
3. 90% 4. 100%
Subtopic:  Energy Flow |
 93%
From NCERT
AIPMT - 1999
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