Question

Question 8: Define ecological pyramids and describe with examples, pyramids of number and biomass.

Class 12 - Biology - Ecosystem Page 257

Answer 1

An ecological pyramid is a graphical representation of various ecological parameters such as the number of individuals present at each trophic level, the amount of energy, or the biomass present at each trophic level. Ecological pyramids represent producers at the base, while the apex represents the top level consumers present in the ecosystem. There are three types of pyramids:

(a) Pyramid of numbers

(b) Pyramid of energy

(c) Pyramid of biomass

Pyramid of numbers:It is a graphical representation of the number of individuals present at each trophic level in a food chain of an ecosystem. The pyramid of numbers can be upright or inverted depending on the number of producers. For example, in a grassland ecosystem, the pyramid of numbers is upright. In this type of a food chain, the number of producers (plants) is followed by the number of herbivores (mice), which in turn is followed by the number of secondary consumers (snakes) and tertiary carnivores (eagles). Hence, the number of individuals at the producer level will be the maximum, while the number of individuals present at top carnivores will be least.

Answer 2

HÈLLØ!!

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$\Huge{\mathfrak{\blue{\underline{ANSWER}}}}$

➖An ecological pyramid is a graphical representation of various ecological parameters such as the number of individuals present at each trophic level, the amount of energy, or the biomass present at each trophic level.

➖Ecological pyramids represent producers at the base, while the apex represents the top level consumers present in the ecosystem.

➖There are three types of pyramids:

(a) Pyramid of numbers

(b) Pyramid of energy

(c) Pyramid of biomass

✔️Pyramid of numbers:

➖It is a graphical representation of the number of individuals present at each trophic level in a food chain of an ecosystem.

➖The pyramid of numbers can be upright or inverted depending on the number of producers.

➖For example, in a grassland ecosystem, the pyramid of numbers is upright.

➖In this type of a food chain, the number of producers (plants) is followed by the number of herbivores (mice), which in turn is followed by the number of secondary consumers (snakes) and tertiary carnivores (eagles).

➖Hence, the number of individuals at the producer level will be the maximum, while the number of individuals present at top carnivores will be least.

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THÅÑKẞ!!