Our Environment Test

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Our Environment Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

Biotic factors are

A
Chemical factors of soil which affect life

B
Physical factors of soil which affect life

C
All living organisms which influence other organisms

D
Living organisms which get eaten by other organisms

Solution

(c) Living organisms have effect on other living organisms and these constitute biotic factors or living factors.
Question 2
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Disposable plastic plates should not be used because:

A
They are made up of light weight materials.

B
They are made up of toxic materials.

C
They are made up of biodegradable materials.

D
They are made up of non-biodegradable materials.

Solution

Certain items cannot be acted upon by decomposers and hence, these item are called non-biodegradable, e.g. - plastics, chemicals like DDT, etc. When items like disposable plastic plates are used, they persist in the environment because they cannot be degraded and may cause hazardous effects on the other biotic components of the ecosystem.
So, the correct answer is option D.
Question 3
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Choose the correct option for the flow of energy in an ecosystem.

A
Sun $$\rightarrow$$ Producer$$\rightarrow$$ Herbivore $$\rightarrow$$ Carnivore

B
Producer $$\rightarrow$$ Herbivore $$\rightarrow$$ Carnivore $$\rightarrow$$ Sun

C
Herbivore $$\rightarrow$$ Carnivore $$\rightarrow$$ Sun $$\rightarrow$$ Producer

D
Carnivore $$\rightarrow$$ Sun $$\rightarrow$$ Producer $$\rightarrow$$ Herbivore
Solution
The flow of energy in an ecosystem occurs in the following sequence
Sun $$\rightarrow$$ Producer $$\rightarrow$$ Herbivore $$\rightarrow$$ Carnivore
The flow of energy is unidirectional because of the following reasons:
(i) Energy flows progressively from one trophic level to another and cannot revert back. The energy given out as heat is lost in the environment, it does not return to be used again.
(ii) Also, the available energy decreases at a higher trophic level. Out of the total energy available, at a particular trophic level, only 10% is passed on to the next trophic level, making it impossible for energy to flow in the reverse direction.
Question 4
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Choose the correct statements with respect to biodegradable and non-biodegradable substances.

A
Biodegradable substances can be broken down into simpler substances by biological processes.
Non-biodegradable substances cannot be broken down into simpler ones by biological processes.

B
Biodegradable substances cannot be broken down into simpler ones by biological processes.
Non-biodegradable substances can be broken down into simpler substances by biological processes.

C
Non-biodegradable substances can be broken down into simpler substances by decomposers.
Biodegradable substances cannot be broken down into simpler substances by decomposers.

D
Biodegradable substances cannot be degraded by biological agents.
Non-biodegradable substances do not pollute the environment.

Solution

Substances that can be broken down into simpler substances by biological processes (for example, decomposition by decomposers like bacteria, fungi, etc.) are said to be biodegradable. For example, wood, paper, etc.
Substances that cannot be broken down into simpler ones by biological processes are said to be non-biodegradable. For example, plastic, DDT, etc.
Question 5
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Which of the following consequences is due to the over exploitation of natural resources by man?

A
Increase in natural resources

B
Ecological imbalance

C
Thicker ozone layer

D
Reappearance of some extinct species

Solution

Natural resources are the resources gifted by nature. these are useful for the sustenance of the living organism on earth. Overexploitation of natural resources leads to ecological balance. Human activities like deforestation is a major threat which causes global warming. Excessive mining shifting of land which causes volcanic eruptions.
So, the correct answer is option B.
Question 6
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The given figure shows the transfer of energy in an ecosystem. In the given food chain, 10,000 J of energy is available to the producers. Calculate and find the amount of energy available to the higher carnivores.

A
1,000 J of energy

B
100 J of energy

C
10 J of energy

D
1 J of energy

Solution

In a food chain, only 10% of energy is passed onto the next trophic level. The remaining energy is lost in metabolic processes and as heat released during respiration. Thus, if originally 10,000 J of energy is available to the producers, at the second trophic level (herbivores), 10% of 10,000 J = 1000 J of energy will be available.
At the third trophic level (lower carnivores), 10% of 1000 J = 100 J of energy will be available.
At the fourth trophic level (higher carnivores), 10% of 100 J = 10 J of energy will be available.
Therefore, the correct answer is option C.
Question 7
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Why are crop fields known as artificial ecosystems?

A
Crop fields are man made.

B
Some biotic and abiotic components are manipulated by humans for the production of crop.

C
Both A and B.

D
None of the above.

Solution

Crop fields are man made and some biotic and abiotic components are manipulated by humans. Artificial ecosystems are those ecosystems which are modified and managed by human beings.
Crop fields are man-made, plants do not grow naturally rather most of the plants are grown by humans according to the season, type of soil, etc. Crop fields are not like wild forest area which is left to the care of nature and can sustain itself.
In crop fields, the land is managed, soil is prepared for sowing seeds, then irrigated and further progress is also kept under observation for getting good yield.
Thus, crop fields are known as artificial ecosystems.
Therefore, the correct answer is option C.
Question 8
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Which of the following statements is related to biological magnification?

A
There is a progressive increase in biological activities through trophic levels.

B
There is a progressive increase in the level of harmful substances through trophic levels.

C
There is a progressive increase in the body weight through trophic levels.

D
There is a progressive increase in the number of organisms through trophic levels.

Solution

The toxic substances which cannot be metabolized get accumulated at a particular trophic level. This leads to an increase in the concentration of the toxicant at successive trophic levels. This phenomenon is called biological magnification and is well-known for mercury and DDT. The higher the trophic level of an organism in the food chain greater will be the magnification of toxic chemicals.
So, the correct answer is option B.
Question 9
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What are the advantages of cloth bags over plastic bags during shopping?

A
Cloth bags are capable of carrying more things.

B
Cloth bags made of biodegradable material do not pollute our environment.

C
Cloth bags can be reused.

D
All of the above.
Solution
Cloth bags have following advantages over plastic bags:
Cloth bags are biodegradable so they do not pollute the environment.
Cloth bags are capable of carrying more things.
They can be reused over and over again.
Question 10
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Consider the following food chain in the same lake.
$$Aquatic \: plant\rightarrow Small \: fish\rightarrow Big \: fish\rightarrow Birds$$
Which of the above organisms is likely to show a minimum amount of pesticide concentration in them?

A
Aquatic plants

B
Small fish

C
Big fish

D
Birds

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Re-Attempt Weekly Quiz Competition

Our Environment Test - 17

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Our Environment Test - 17

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SHARING IS CARING

Question 1

Chemical factors of soil which affect life

Physical factors of soil which affect life

All living organisms which influence other organisms

Living organisms which get eaten by other organisms

Solution

Question 2

They are made up of light weight materials.

They are made up of toxic materials.

They are made up of biodegradable materials.

They are made up of non-biodegradable materials.

Solution

Question 3

Sun $$\rightarrow$$ Producer$$\rightarrow$$ Herbivore $$\rightarrow$$ Carnivore

Producer $$\rightarrow$$ Herbivore $$\rightarrow$$ Carnivore $$\rightarrow$$ Sun

Herbivore $$\rightarrow$$ Carnivore $$\rightarrow$$ Sun $$\rightarrow$$ Producer

Carnivore $$\rightarrow$$ Sun $$\rightarrow$$ Producer $$\rightarrow$$ Herbivore

Solution

Question 4

Biodegradable substances can be broken down into simpler substances by biological processes.Non-biodegradable substances cannot be broken down into simpler ones by biological processes.

Biodegradable substances cannot be broken down into simpler ones by biological processes. Non-biodegradable substances can be broken down into simpler substances by biological processes.

Non-biodegradable substances can be broken down into simpler substances by decomposers.Biodegradable substances cannot be broken down into simpler substances by decomposers.

Biodegradable substances cannot be degraded by biological agents.Non-biodegradable substances do not pollute the environment.

Solution

Question 5

Increase in natural resources

Ecological imbalance

Thicker ozone layer

Reappearance of some extinct species

Solution

Question 6

1,000 J of energy

100 J of energy

10 J of energy

1 J of energy

Solution

Question 7

Crop fields are man made.

Some biotic and abiotic components are manipulated by humans for the production of crop.

Both A and B.

None of the above.

Solution

Question 8

There is a progressive increase in biological activities through trophic levels.

There is a progressive increase in the level of harmful substances through trophic levels.

There is a progressive increase in the body weight through trophic levels.

There is a progressive increase in the number of organisms through trophic levels.

Solution

Question 9

Cloth bags are capable of carrying more things.

Cloth bags made of biodegradable material do not pollute our environment.

Cloth bags can be reused.

All of the above.

Solution

Question 10

Aquatic plants

Small fish

Big fish

Birds

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Biodegradable substances can be broken down into simpler substances by biological processes.
Non-biodegradable substances cannot be broken down into simpler ones by biological processes.

Biodegradable substances cannot be broken down into simpler ones by biological processes.
Non-biodegradable substances can be broken down into simpler substances by biological processes.

Non-biodegradable substances can be broken down into simpler substances by decomposers.
Biodegradable substances cannot be broken down into simpler substances by decomposers.

Biodegradable substances cannot be degraded by biological agents.
Non-biodegradable substances do not pollute the environment.