Question

The given pyramid best represents

a. Pyramid of energy in forest ecosystem
b. Pyramid of biomass in forest ecosystem
c. Pyramid of numbers in grassland ecosystem
d. Pyramid of numbers in forest ecosystem

Answer 1

Hint: As we know that the pyramids take into account the number of organisms present at each trophic level making up the level for the pyramid. While going up or higher in the pyramid the number of organisms decreases.

Complete answer:
The pyramids take into account the number of organisms present at each trophic level making up the level for the pyramid. While going up or higher in the pyramid the number of organisms decreases. The given pyramid represents the number in the forest ecosystem.
The one which are at the base in the ecological pyramid are producers and are in large numbers sometimes and they produce the base. There are three types of pyramids i.e. biomass, energy, number and each ecosystem has different pyramids.
The producers are trees in a forest ecosystem and they form the base of the pyramid. They are less in number but they support a higher number of herbivores i.e. birds, elephants, etc.
 The number decreases while going higher in the pyramid as primary consumers support very few carnivores as a result the pyramid is spindle shaped.
The importance of the number pyramid is: It can serve as the basis for quantitative analysis of the ecosystem and they can be used in determination of how the population of one species can affect the other species.
Option (a) Pyramid of energy in the forest ecosystem- This pyramid represents the amount of energy used by the organisms at different trophic levels. It is always in an upright position and the producer has more energy compared to other trophic levels.
Option (b) Pyramid of biomass in the forest ecosystem- This represents the living and dead tissues in the ecosystem. In case of grassland the pyramid is upright and in case of ponds the pyramid is inverted.
Option (c) Pyramid of numbers in the grassland ecosystem- In this the number of producers is higher compared to the consumers and primary consumers are less than producers. This pyramid is in upright nature.
Option (d) Pyramid of numbers in forest ecosystem- This pyramid is spindle shaped and the number decreases while going higher in the pyramid as primary consumers support very few carnivores.

Hence, the correct answer is option (d) i.e. Pyramid of numbers in the forest ecosystem.

Note:
While going up or higher in the pyramid the number of organisms decreases. The pyramid of numbers in the forest ecosystem is spindle shaped. The number decreases while going higher in the pyramid as primary consumers support very few carnivores. The living or dead tissues in the ecosystem is known as biomass.