Question: 111. Which of the following statements is not correct?
(1) Pyramid of biomass in sea is generally inverted.
(2) Pyramid of biomass in sea is generally upright.
(3) Pyramid of energy is always upright.
(4) Pyramid of numbers in a grassland ecosystem is upright.
Answer: Option (2)
Explanation:
In marine ecosystems, the pyramid of biomass is generally inverted because the biomass of producers like phytoplankton is less than that of consumers at any given time.
Phytoplankton have a very high rate of reproduction and turnover, supporting a larger biomass of consumers.
The pyramid of energy is always upright because energy decreases at each successive trophic level due to loss of energy as heat.
The pyramid of numbers in a grassland ecosystem is upright as the number of producers is more than herbivores and carnivores.
Therefore, the statement that the pyramid of biomass in sea is generally upright is not correct.