Describe the advantages for keeping the ecosystems healthy - Biology


Describe the advantages for keeping the ecosystems healthy



The various advantages of keeping the ecosystems healthy are as follows:

  • Healthy ecosystem is the base for a wide range of economic, environmental and aesthetic goods and services.
  • The products of ecosystem processes are named as ecosystem services, as they are of great help to the organisms living within an ecosystem.
  • Healthy forest ecosystem purify air and water.
  • It also mitigates droughts and floods and cycle nutrients.
  • Healthy ecosystem generates fertile soil and provides wildlife habitat.
  • Maintenance of biodiversity is also an important aspect of healthy ecosystem.
  • It also provides aesthetic, cultural and spiritual values.
Concept: Ecosystem
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2014-2015 (March) Delhi Set 1

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What is an ecosystem ?

Define the following term and give one example:


Which of the following is an artificial ecosystem?
(a) pond
(b) crop field
(c) lake
(d) forest

An ecosystem includes ______.

Where does all the energy in living organisms originate from?

How is energy introduced into the ecosystem?

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

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 is shown in the picture? Write name and trophic level of each component.

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.

Generally, we do not clean natural ponds or lakes but an aquarium needs periodic cleaning. Why? 

Give my information

Describe the following pictures

Define the following term and give two examples.


Natural water bodies are not regularly cleaned whereas an aquarium needs regular cleaning. Why?

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?

List the characteristic flora of the coniferous forests?

In which parts of the world are tropical rainforests found?

What is a forest biome?

Ecosystem may be defined as

Biome is

Annual rainfall in the area of deciduous forest is

Which one is not a factor of the abiotic environment?

How do gymnosperms and angiosperms differ?

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

What is primary productivity?

Define decomposition.

Describe the processes and products of decomposition.

This is the smallest unit of biosphere.

A: Heterotrophs do not produce their own food.

R: They depend on autotrophs for their nourishment.

__________ is a system of interlocking and independent food chains.

Producers are also called autotrophs.

Distinguish between terrestrial biomes and Aquatic biomes.

Explain the various components of ecosystem.

Find an odd one out.

What is indicated by this symbol?

Give scientific reason.

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

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?

  1. Write the given food chain in the appropriate sequence.
    Grasshopper - Snake - Rice field - Eagle - Frog
  2. In which ecosystem given the food chain is included? Explain the ecosystem.
  3. If the frog population declines all of a sudden what will be the effect on paddy fields?

Identify the fresh water ecosystem.

The Pacific ocean is an example of an marine 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?

The study about freshwater ecosystem is called ______.

Abiotic components include ______.

Explain the following term


______ are self-nourishing components of the ecosystem.

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

______ is the best example of natural terrestrial ecosystem.

Ecosystem originated without human intervention is called ______.

Forest and Mountain regions are the best examples of the artificial terrestrial ecosystem.

If we protect the ecosystem, we can reduce waste by using durable goods.


Edaphic factor: Water in soil:: Physical factor: ______.

An example for artificial aquatic ecosystem is ______.

A Zoo is a natural ecosystem.

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

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

We do not clean ponds or lakes, but an aquarium needs to be cleaned. Why?

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

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

Which are the major producers in an aquatic ecosystem?

Give the stratification seen in open seas.

Which is the most important service provided by environment?

In an ecosystem, bacteria are considered as______.

Explain BOD and its effects on aquatic ecosystem.


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