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 |
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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 |
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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 |
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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 |
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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 |
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