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#1. There are two statements for each question. In the light of these two statements,choose the most appropriate answer from the options given below.
Statement 1: The amount of usable energy remains constant as it is passed from one trophic level to another.
Statement 2: The energy within an ecosystem is constant and never changes.
In the light of these two statements, choose the most appropriate answer from the options given below.
Explanation:
- Statement 1: “The amount of usable energy remains constant as it is passed from one trophic level to another.”
- This statement is incorrect. As energy flows through an ecosystem, it diminishes at each trophic level due to metabolic processes and heat loss. According to the 10% law of energy transfer, only about 10% of the energy at one trophic level is passed on to the next; the remaining 90% is lost, primarily as heat.
- Statement 2: “The energy within an ecosystem is constant and never changes.”
- This statement is also incorrect. While the total energy in a closed system remains constant (as per the first law of thermodynamics), ecosystems are not closed systems. They continuously receive energy (mainly from the sun) and lose energy (primarily as heat). Therefore, the energy within an ecosystem is dynamic, with constant input and output.
Conclusion:
Since both statements are incorrect, the most appropriate answer is: B) Both Statement 1 and Statement 2 are incorrect.
#2. Desertification leads to decline in _____________.
#3. Where is the level of erosion highest?
#4. Deforestation adversely affects the ____________.
#5. Desertification often occurs in ____________.
