Give scientific reason. The various food chains in the ecosystem maintain the environmental balance. - Science and Technology 2

Short Note

Give scientific reason.

The various food chains in the ecosystem maintain the environmental balance.



  1. Food chain is a definite sequence of interaction between producers, consumers and decomposers (saprophytes).
  2. Existence of producers, consumers and decomposers is interlinked.
  3. If number of any of these increases or decreases the ecological balance is disturbed.
    Therefore, the various food chains in the ecosystem maintain the environmental balance.
Concept: Ecosystem
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Chapter 4: Environmental Management - Give scientific reasons


Describe the advantages for keeping the ecosystems healthy

Define the following term and give one example:


Why is a lake considered to be a natural ecosystem? 

What is the functional unit of the environment comprising of the living and non-living components called?

Which one of the following is not a terrestial ecosystem?
forest, Grassland, Aquarium, Desert

What will be the consequence of the absence of decomposers in the ecosystem

Define an ecosystem.

Give examples of any two ecosystems.

In an ecosystem, 10% of energy available for transfer from one trophic level to the next is in the form of ______.

In an ecosystem :
(i) the flow of energy is unidirectional
(ii) the flow of materials is unidirectional
(iii) the flow of materials is cyclic
(iv) the flow of energy is cyclic.

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (i) and (iii)

Put a tick mark (✓) against the correct alternative in the following statement:

The term “ecosystem” is derived from the Greek word “Oikos” meaning.

Match the items in Column I with as many items as possible in Column II.

  column I Column II
1 Grass (i) Carnivore
2 Deer (ii) Decomposers
3 cobra (iii) Primary Consumer
4 Vulture (iv) Autotroph
5 Microbes (v) Scavenger

State whether true or false– Flow of nutrients in an ecosystem is unidirectional.

Reorganize the following food chain. Describe the ecosystem to which it belongs. Grasshopper – Snake – Paddy field – Eagle – Frog.

What do we learn from the story of Jadav Molai Peyang?

What are the meanings of following symbols? Write your role accordingly?

If frog population in paddy fields declines all of a sudden,
a) What will be the effect on paddy crop?
b) Number of which consumers will decline and which will increase?
c) Name the Indian states where paddy is cultivated on a large scale.

In a food chain autotrophic plants are present at the _______ level.

Give my information

Describe the following pictures

Define the following term and give two examples.


Answer the following question.
Write the different components of a lac-operon in E. coli. Explain its expression while in an ’open’ state.

What do you understand by the term 'environment'?

How is man-made ecosystem formed?

Give two features of forest ecosystem.

In which parts of the world are tropical rainforests found?

Explain the features of a forest biome?

Ecosystem may be defined as

Biome is

Word ecosystem was coined by

Annual rainfall in the area of deciduous forest is

Which one is not a factor of the abiotic environment?

Which of the following is most often a limiting factor of the primary productivity in any ecosystem?

Describe the processes and products of decomposition.

Give a brief description of the factors that affect primary productivity.

A: Heterotrophs do not produce their own food.

R: They depend on autotrophs for their nourishment.

___________ are also called Heterotrophs.

What is an ecosystem?

Biosphere provides a stable ecosystem.

Explain the various components of ecosystem.

Write a paragraph on the functions of an ecosystem.

____________ is an organic compound of abiotic components.

Environment is a broad concept.

Give scientific reason.

Without the existence of nature, human existence is almost impossible.

Which are two components affecting the environment? State two examples of each.

Complete food chain.

Grass → _________ → Frog → ________ → Eagle

Why is it said that pollution control is important?

The Pacific ocean is an example of an marine ecosystem.

Define ecosystem.

Identify the similar characteristics of: Lantana, African catfish and Eichhomia.

In a very short period of time, a threat to the ecosystem is caused due to the loss of ______ species.

In which one of the following organisms does the body fluid enter through nephrostome?

Arrange the following in the proper order of hydrarch succession and choose the correct option.

  1. Scrub stage
  2. Marsh - meadow stage
  3. Submerged free floating plant stage
  4. Phytoplankton
  5. Forest
  6. Submerged plant stage
  7. Reed swamp stage

Which one of the following is NOT a natural aquatic ecosystem?

An ecosystem is represented in the figure given above. This ecosystem will be self-sustaining if ______.

Which one of the following is an artificial ecosystem?

The chain of transformation of energy from one group of organisms to another through various trophic levels is called a ______.

Explain the following term


Explain the following term


The ______ is the ultimate source of energy for the biosphere as a whole.

Decomposers live on dead and decaying plants and animals and are called ______.

______ is the best example of natural terrestrial ecosystem.

Ecosystem originated without human intervention is called ______.

The ecosystem in water is called ______ ecosystem.

Fish and other water creatures and plants are maintained in the terrarium.


Natural terrestrial ecosystem: Forest:: Artificial terrestrial ecosystem: ______.

Define – Aquarium.

Ecosystems created and maintained by humans are called?

Match the Following:

1. Edaphic factor a. Primary consumer
2. Snails b. Non biodegradable
3. Crow c. Decomposers
4. Earthworms d. Oranic matter in soil
5. Hazardous chemicals e. Omnivores

Cooperation of the two photosystems of the chloroplast is required for:

Complete the following chart related to the components of the Ecosystem.

Define the term:

Net Primary Productivity

"Although gardens are created by man but they are considered to be an ecosystem." Justify this statement.

Which are the major producers in an aquatic ecosystem?

Give the stratification seen in open seas.

In an ecosystem, bacteria are considered as______.

Explain BOD and its effects on aquatic ecosystem.


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