Our Environment Test

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Our Environment Test - 16

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Weekly Quiz Competition

Question 1
1 / -0

An ecosystem is a complex interacting system of:

A
Individual and community

B
Population and nearby industry

C
Community and their physical environment

D
Community and their soil condition
Solution
- An ecosystem is a segment of the biosphere consisting of a community of living beings and the abiotic or physical environment interacting and exchanging materials between them.
- A community is a group of potentially interacting species living in the same region.
Therefore, the correct answer is option C.
Question 2
1 / -0

What must be preserved in an ecosystem, if the system needs to be maintained properly?

A
Producers and carnivores

B
Producers and decomposers

C
Carnivores and decomposers

D
Herbivores and carnivores

Solution

The most important characteristics of any ecosystem are energy flow and the cycling of materials. Producers and decomposers are indispensable for any ecosystem. Producers trap solar energy and convert it into usable form as carbohydrates which are passed on to successive levels through food chains and food webs. The other important characteristic of the ecosystem is the cycling of materials. These are called biogeochemical cycles, in which decomposers are most important because they will release the mineral nutrients back to the environment.
Thus, the correct answer is option B.
Question 3
1 / -0

First link in any food system is a green plant because

A
green plants can synthesize food.

B
they consume the food produced by other organisms.

C
they are fixed at one place.

D
None of the above.

Solution

Green plants are photosynthetic organisms. They trap solar energy and use it to synthesize carbohydrates. The carbohydrates are the useful form of energy. All the other organisms depend on plants either directly or indirectly. Therefore, the correct answer is option A.
Question 4
1 / -0

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

A
Heat energy

B
Light energy

C
Chemical energy

D
Mechanical energy

Solution

In any ecosystem, ultimate source of energy is the sun. This solar energy is trapped by green plants which convert it into chemical energy, and store it as carbohydrates. This chemical energy in the form of food is passed on from one organism to another via food chain in ecosystem.
Therefore, the correct answer is option C.
Question 5
1 / -0

Which one of the following is contributed by biotic elements to the ecosystem

A
Humidity

B
Oxygen

C
Texture and porosity of soil

D
Rainfall

Solution

A)Humidity is dependent on average temperature and number of water bodies present in a given area.
B) Plants release oxygen in the atmosphere after photosynthesis.
C) Texture and porosity of soil is not dependent on biotic elements.
D) The rainfall pattern and amount of rainfall directly depends on the number of water bodies in an area when the water bodies of an area are heated during the day, a large amount of water evaporates and goes into the air.

So the correct option is B
Question 6
1 / -0

In the following groups of materials, which group contains only non-biodegradable items?
(i) Wood, paper, leather
(ii) Polythene, detergent, PVC
(iii) Plastic, detergent, grass
(iv) Plastic, bakelite, DDT

A
(iii)

B
(iv)

C
(i) and (iii)

D
(ii) and (iv)
Solution
- Biodegradable items are those, which can be degraded by biological agencies like detrivores.
- These organisms feed on the dead and decaying matter and convert them into minerals and return those minerals back to the environment, thus completing the cycle of nutrients.
- Non-biodegradable items are those which cannot be acted upon by detrivores. Thus, such items cannot be degraded or decomposed. In a way, they are a permanent addition to the environment and cannot be done away with.
- For example, polythene, thermosetting plastics like bakelite, insecticides like DDT, detergent, PVC, etc. These items cannot be degraded biologically.
- Thus the correct answer is option D.
Question 7
1 / -0

The ultimate source of energy is:

A
Plants

B
Producers

C
Universe

D
Sun
Solution
- The sun is considered the primary energy source since it is the source of nearly all the earth’s energy.
- Plants produce food using sunlight, and the food we get from plants and animals also has its primary sunlight source.
- The fossil fuels we use in our everyday lives come from dead plants and animals that have their origins as solar energy again.
- Hence, the correct answer is option D.
Question 8
1 / -0

A rat feeding upon potato tuber is ________.

A
Producer

B
Carnivore

C
Decomposer

D
Primary consumer
Solution
- Rat is a herbivore animal, who used to eat plant products (primary consumer).
- The potato plant is a producer that traps solar energy and produces food (carbohydrates), which are stored in potato tubers.
- The rat cannot produce their own food by the use of solar energy and hence, feeds on potato tuber for his life processes.
Thus, the correct answer is option D.
Question 9
1 / -0

Ozone-layer is getting depleted because of?

A
Excessive use of automobiles.

B
Excessive formation of industrial units.

C
Excessive use of man-made compounds containing both fluorine and chlorine.

D
Excessive deforestation.
Solution
Correct option: C
Explanation:
The ozone layer is present in the stratosphere and protects us from the harmful UV rays coming from the sun.
It is composed of ozone gas produced by the fusion of oxygen and UV rays.
But gases such as fluorine and chlorine destroy it.
The ozone molecules being highly unstable react with these gases.
As a result, the ozone layer gets destroyed.
Hence, the ozone layer is getting depleted because of the "excessive use of man-made compounds containing both fluorine and chlorine".
Question 10
1 / -0

What would happen if all the oxygen present in the environment is converted to ozone?

A
We will still be able to breathe

B
It will be poisonous and will kill living forms.

C
Ozone is not stable, hence it will be toxic.

D
It will help harmful sun radiations to reach earth and damage many life forms.

Solution

Ozone is a deadly poison and if all the oxygen were to get converted to ozone, no life on the earth would survive.

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Re-Attempt Weekly Quiz Competition

Our Environment Test - 16

Result

Our Environment Test - 16

Score

-

Rank

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SHARING IS CARING

Question 1

Individual and community

Population and nearby industry

Community and their physical environment

Community and their soil condition

Solution

Question 2

Producers and carnivores

Producers and decomposers

Carnivores and decomposers

Herbivores and carnivores

Solution

Question 3

green plants can synthesize food.

they consume the food produced by other organisms.

they are fixed at one place.

None of the above.

Solution

Question 4

Heat energy

Light energy

Chemical energy

Mechanical energy

Solution

Question 5

Humidity

Oxygen

Texture and porosity of soil

Rainfall

Solution

Question 6

(iii)

(iv)

(i) and (iii)

(ii) and (iv)

Solution

Question 7

Plants

Producers

Universe

Sun

Solution

Question 8

Producer

Carnivore

Decomposer

Primary consumer

Solution

Question 9

Excessive use of automobiles.

Excessive formation of industrial units.

Excessive use of man-made compounds containing both fluorine and chlorine.

Excessive deforestation.

Solution

Question 10

We will still be able to breathe

It will be poisonous and will kill living forms.

Ozone is not stable, hence it will be toxic.

It will help harmful sun radiations to reach earth and damage many life forms.

Solution

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