Question

Pyramid of biomass for a grazing food chain represents.
(a) A gradual decrease in biomass from apex to base.
(b) A gradual decrease in biomass from producers to tertiary consumers.
(c) A gradual increase in the biomass from producers to tertiary consumers.
(d) No change in biomass.

Answer 1

Hint: It represents the total mass of the organisms that are present at each of the trophic levels which are found to be more if the quantity of the organism is more in a particular area.

Complete answer:
The pyramid of biomass is formed by the biomass of the individuals of the food chain which are present at any one time level. The pyramid of biomass indicates a decrease in biomass in each trophic level from base to apex. It is mostly upright.
-The pyramid of biomass for a grazing food chain is upright. In the upright pyramid of biomass, the trophic levels are arranged in ascending order.
-The biomass is maximum at the base/bottom where producers are found while the biomass at the apex/top is minimum where tertiary consumers are found.
-A gradual decrease in the biomass from producers to tertiary consumers in the grazing food chain pyramid represents the ascending trophic level.
-The herbivores ingest the total biomass in the producers’ which is found to be more as in the total herbivores total biomass in an ecosystem. Likewise, the biomass of the primary carnivores will be less than herbivores.
-The biomass can be measured with the help of a bomb calorimeter.
-The pyramid of biomass may be found to be inverted in the case of the pond ecosystem.

So, the correct answer is 'A gradual decrease in biomass from producers to tertiary consumers'.

Note:
There are three major types of ecological pyramids: Pyramid of biomass (it shows the amount of organic matter present inside the organism), Pyramid of numbers (it shows the individuals or organisms present in each trophic level), and Pyramid of energy (it shows the amount of energy passed from one trophic level to another). They are called the ecological pyramids, and may also be known as Eltinian pyramids, food pyramid, or trophic pyramid.