8. Which of the following regarding ecological pyramid is not correct? (a) In most ecosystems, the pyramid of numbers and biomass are upright (b) The total energy flow at successive trophic level always decreases (c) The pyramid of energy expresses mainly the rate of food production (d) In deep water ecosystem, the pyramid of biomass is upright.?

Question

Answer

Option d is correct.
because inverted pyramid of biomass is present in aquatic ecosystem.
Reference NCERT page 248 fig 14.4

Answer

D

Answer

D) In aquatic ecosystem, pyramid of biomass is inverted bcoz in it producers are micro organism and their biomass is veryless

Answer

D....pyramid of biomass is inverted in aquatic ecosystem...

Answer

I think the answer should be C...because the pyramid of energy means how much capacity of ding work does that organism possess...

Answer

D

Answer

The correct option is (d) In deep water ecosystem, the pyramid of biomass is upright.

Explanation:
Ecological pyramids are graphical representations of the trophic structure and energy flow in an ecosystem. They are divided into three types - pyramid of numbers, pyramid of biomass, and pyramid of energy. These pyramids are used to depict the relationship between different trophic levels in an ecosystem.

(a) In most ecosystems, the pyramid of numbers and biomass are upright:
- This statement is correct. In a majority of ecosystems, the pyramid of numbers and biomass are upright, meaning that the number or biomass of organisms decreases at each higher trophic level. This is because energy is lost as heat and through metabolic processes as it moves up the food chain, resulting in a decrease in the number and biomass of organisms at higher trophic levels.

(b) The total energy flow at successive trophic levels always decreases:
- This statement is correct. Energy flow in an ecosystem is unidirectional and follows the 10% rule. Only about 10% of energy is transferred from one trophic level to the next, while the remaining 90% is lost as heat or used for metabolic processes. Therefore, the energy available to higher trophic levels is always less than the energy available to the lower trophic levels.

(c) The pyramid of energy expresses mainly the rate of food production:
- This statement is correct. The pyramid of energy represents the flow of energy through different trophic levels. It shows the rate of food production and energy transfer between trophic levels, with each level representing a specific amount of energy. The width of each bar in the pyramid of energy represents the energy available at that particular trophic level.

(d) In deep water ecosystem, the pyramid of biomass is upright:
- This statement is incorrect. In deep water ecosystems, such as oceans, the pyramid of biomass is inverted or partially inverted. This is because the primary producers in these ecosystems, such as phytoplankton, have a rapid turnover rate and high reproductive capacity. As a result, their biomass is smaller compared to the biomass of the consumers at higher trophic levels, such as zooplankton, fish, and marine mammals. Therefore, the pyramid of biomass in deep water ecosystems is often inverted.

In conclusion, the correct option regarding ecological pyramids is (d) In deep water ecosystem, the pyramid of biomass is upright. The pyramid of biomass in deep water ecosystems is inverted or partially inverted due to the high biomass of consumers at higher trophic levels compared to the primary producers.

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