A) Pyramid of biomass in sea is generally inverted as the biomass of fish far exceeds that of phytoplanktons.
B) Pyramid of energy is mostly upright, but sometimes it may be inverted.
C) Food chains are generally short with few trophic levels as only 10% of the energy is transferred to each trophic level from the lower trophic level.
D) Pyramids of number and biomass may be either upright or inverted.
Correct Answer: B
Solution :
: Pyramid of energy is a graphic representation of amount of energy trapped per unit time and area in different trophic levels of a food chain with producers forming the base and top carnivores the tip. The energy content is expressed as \[kcal/{{m}^{2}}/yr\]. Pyramids of energy are always upright, since maximum energy content is present in the producers. From there, only 10% of energy is used by the next trophic level. Every trophic level gets only 10% energy of the lower trophic level. Energy level always decreases along a food chain hence always upright pyramid is obtained:
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