Question: 100. 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 during photosynthesis in an ecosystem is called net primary productivity (NPP).
In the light of the above statements, choose the most appropriate answer from the options given below:
(1) Both statement I and statement II are correct
(2) Both statement I and statement II are incorrect
(3) Statement I is correct but statement II is incorrect
(4) Statement I is incorrect but statement II is correct
Answer: Option (3)
Explanation:
Solar energy is the primary source of energy for almost all ecosystems.
Green plants capture solar energy during photosynthesis and convert it into chemical energy.
Hence, Statement I is correct.
The rate of production of organic matter during photosynthesis is called gross primary productivity.
Net primary productivity is the amount of organic matter left after subtracting respiratory losses from gross primary productivity.
This relationship is given by \mathrm{NPP}=\mathrm{GPP}-\mathrm{R}.
Therefore, Statement II is incorrect.
Hence, the correct answer is option (3).