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Eduncle posted an MCQ

October 19, 2019 • 19:46 pm

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CSIR NET
Life Sciences

Given below is an ecological pyramid.

Choose Your Answer:

A Pyramid of number of a parasitic food chain and pyramid of biomass of a pond ecosystem

B Pyramid of number of a pond ecosystem and pyramid of biomass of a forest ecosystem

C Pyramid of energy of a grassland and pyramid of biomass of an open ocean ecosystem

D Pyramid of biomass of a grassland and pyramid of number of a tropical forest ecosystem

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Astha pandey

b is my answer
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Eduncle Best Answer

“The herbivores which are the fruit-eating birds, elephants, deer’s etc. are more in number than the producers. Then there is a gradual decrease number of successive carnivores, thus making the pyramid again upright. However in a parasitic food chain the pyramids are always inverted.”

Pyramids of Biomass:

They are comparatively more fundamental instead of geometric factor show the quantitative relationships of the standing crops. In grassland and forest, there is generally a gradual decrease in biomass of organisms at successive levels from the producers to the top carnivores.

Thus pyramids are upright. However, in a pond as the producers are small organisms, their biomass is least, and this value gradually shows an increase towards the apex of the pyramid, thus making the pyramid inverted in shape.
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