Paper 1 · People, Development and Environment
Statement I: The pyramid of energy is always upright, because during energy transfer between adjacent trophic levels energy is lost as heat. Statement II: The pyramid of biomass can be inverted, as seen in a pond ecosystem where the phytoplankton biomass is less than that of the small herbivorous fish. Which of the above statements are true?
- The pyramid of energy is always upright because energy is lost as heat between trophic levels
- The pyramid of biomass can be inverted, as in a pond where phytoplankton biomass is less than that of small fish
AStatements 1 and 2 are true ✓ Correct
BOnly statement 1 is true
COnly statement 2 is true
DBoth statements are false
Correct answer: (A) Statements 1 and 2 are true — Both statements are true, so that is the answer.
Explanation
★Both statements are true, so that is the answer.
★The pyramid of energy is always upright because energy is lost as heat at each transfer.
★So statement one is true.
★The pyramid of biomass can be inverted, as in a pond with little phytoplankton but many small fish.
★So statement two is also true.
★Since both hold, both statements are true.
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