Define ecological pyramids. - Biology


Define ecological pyramids.



An ecological pyramid is a graphical representation of various environmental 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.

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Chapter 14: Ecosystem - Exercises [Page 257]


NCERT Biology Class 12
Chapter 14 Ecosystem
Exercises | Q 8.1 | Page 257
Balbharati Biology 12th Standard HSC for Maharashtra State Board
Chapter 14 Ecosystems and Energy Flow
Exercises | Q 4.1 | Page 320

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Give diagrammatic representation of pyramid of numbers.

Why the pyramid of energy is always upright? Explain.

Distinguish between Food chain and food web

Describe with examples of pyramids of number, and biomass.

Explain energy pyramid

Which organisms constitute the last trophic level?

“The pyramid of biomass is not always upright.” Explain the statement.

With reference to the levels of an organisation, differentiate between living organisms and non-living objects.

Answer the following question.
What is an ecological pyramid? Compare the pyramids of energy, biomass, and numbers.

Explain with the help of labelled diagrams, the difference between an upright pyramid of biomass and an inverted pyramid of biomass.

Secondary consumers are __________.

Give an example of an ecosystem that shows an inverted pyramid of numbers.

Give an example of an ecosystem that shows an inverted pyramid of biomass.

Distinguish between the upright and inverted pyramid of biomass.

Which ecosystem has the maximum biomass?

In a tree ecosystem the pyramid of numbers is:

Pyramid of energy in grassland and pond ecosystem is always ______.

Which one of the following is not used for construction of ecological pyramids?

Which of the following organism form the decomposers?

In a pyramid of biomass, if the total dry weight (kgm-2) of primary produces is about 809, it well increases at tertiary consumer level up to ______.

Which one of the following statements for pyramid of energy is incorrect, whereas the remaining three are correct?

Pyramid of biomass in terrestrial ecosystem shows sharp decline in

In an aquatic ecosystem, a mollusc typically belongs to-

Which of the following statements is not correct?

Name any two organisms which can occupy more than one trophic level in an ecosystem.

The number of trophic levels in an ecosystem are limited. Comment.

What are the shortcomings of ecological pyramids in the study of ecosystem?

What are the three types of ecological pyramids? What information is conveyed by each pyramid with regard to structure, function and energy in the ecosystem?

Draw a diagram of pyramid of energy.

A graphic representation of the biomass relationship between the producer and consumer in an ecosystem is called ______.

The biomass of a standing crop of phytoplankton is 4 kg/m2, which supports a large standing crop of zooplankton having a biomass of 11 kg/m2. This is consumed by small fishes having a biomass of 25 kg/m2, which are then consumed by large fishes with a biomass of 37 kg/m2.

Draw an ecological pyramid indicating the biomass at each stage and also name the trophic levels. Mention whether it is an upright or inverted pyramid.

Give scientific reasons:

The pyramid of energy is always upright.

Describe pyramid of energy with the help of diagram.


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