Ecological succession is the constant and gradual change in a species of a given region with respect to the changing circumstances. It is an expected change and is an unavoidable process of nature as all the biotic (living) components have to follow up with the changes in our environment. The means of succession starts with the development of a bare area due to several reasons like a volcanic eruption, flooding, disease, landslide, deposition, erosion, fire and the formation of a bare area is known as nudation.

The ecosystem is part of the biosphere, and it exactly means the surroundings of an organism. In other terms, there exists a mutual intercommunication between every organism and its environment and every organism gets accommodated to its environmental conditions, grows and reproduce. The sum of all the external conditions and influences both abiotic and biotic affecting the life and progress of an organism in its natural habitat is defined as the environment.

Every living thing in an ecosystem is a member of multiple food chains. The continuing sequence of organisms through which energy and nutrients transfer as one organism eats another is known as the food chain. All the interconnected and overlapping food chains in an ecosystem is known as the food web.

E M B I B E

A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 14 - Ecosystem>EXERCISE>Q 21

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12th West Bengal Board

IMPORTANT

Earn 100

What is nudation ?

Important Questions on Ecosystem

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12th West Bengal Board

IMPORTANT

A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 14 - Ecosystem>EXERCISE>Q 1

Define ecosystem.

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12th West Bengal Board

IMPORTANT

A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 14 - Ecosystem>EXERCISE>Q 2

What is food chain? Give one example.

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12th West Bengal Board

IMPORTANT

A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 14 - Ecosystem>EXERCISE>Q 3

What do you mean by biogeochemical cycles?

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12th West Bengal Board

IMPORTANT

A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 14 - Ecosystem>EXERCISE>Q 4

What is food web ?

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12th West Bengal Board

IMPORTANT

A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 14 - Ecosystem>EXERCISE>Q 5

Draw a food chain with respect to energy flow in a community formed of the organism named below_ (a) Hawk (b) Grasshopper (c) Grass (d) Snake (e) Toad.

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12th West Bengal Board

IMPORTANT

A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 14 - Ecosystem>EXERCISE>Q 6

What do you mean by producers and consumers?

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12th West Bengal Board

IMPORTANT

A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 14 - Ecosystem>EXERCISE>Q 7

What are plankton and benthos ?

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12th West Bengal Board