Our Environment Test

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Our Environment Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

In an ecosystem, bacteria and fungi are the:

A
Autotrophs

B
Primary consumers

C
Decomposers

D
Secondary consumers

Solution

There are some living organisms that prepare their own food (autotrophic) and some that depend on others for food (heterotrophic).
Amongst the latter, some organisms feed on dead plants and animals to obtain their nutrition. They convert the complex organic substances into simple substances and thus obtain nutrition and energy.
This process of breakdown is called decomposition and the organisms which perform decomposition are called decomposers.
Thus, the correct answer is option C.
Question 2
1 / -0

Food chain starts with

A
Nitrogen fixation

B
Excretion

C
Photosynthesis

D
Respiration

Solution

Green plants are known as autotrophs. They prepare their own food in the presence of sunlight, with the help of a pigment called chlorophyll. The process, in which they take away carbon dioxide from air and water from the soil and give out oxygen to prepare food is called photosynthesis.
So we can say the process of photosynthesis is the initiator of food chain as the food and energy produced by plants is consumed further by consumers.
So, option C "Photosynthesis" is the correct option.
Question 3
1 / -0

The scientists who study ecosystems are called:

A
Ecologists

B
Economists

C
Engineers

D
Doctors

Solution

The study of the ecosystem is called 'ecology'. The scientists who study the ecosystem are called 'ecologists'.
So, the correct option is A.
Question 4
1 / -0

Each ecosystem consists of ........... main components.

A
Three

B
Two

C
Four

D
Five

Solution

An ecosystem is made up of two components- biotic and abiotic. It includes the interaction of the living things which are the biotic components in a given area with the non-living environment which are the abiotic factors such as weather, earth, sun, soil, climate and atmosphere. Thus the correct answer is option B.
Question 5
1 / -0

UV radiation increases the chances of ________ .

A
skin cancer

B
lung cancer

C
both $$A$$ and $$B$$

D
none of the above

Solution

UV is radiation increases the chances of skin cancer, which is why ozone layer is very important as it shields the surface of earth from these UV radiations of the sun.

Option "A" is correct.
Question 6
1 / -0

_____ are the cause of depletion of the atmospheric ozone layer.

A
Chlorofluorocarbons

B
$$CO_2$$

C
$$SO_2$$

D
none of the above

Solution

Chlorofluorocarbons are the cause of depletion of the atmospheric ozone layer.
Question 7
1 / -0

Which of the following is a biotic factor?

A
Light

B
Air

C
Parasite

D
Temperature

Solution

The ecosystem comprises of both biotic and abiotic factors. Biotic factors include all living organisms present in the environment. It includes plants, animals and microorganisms. In contrast, the abiotic components include the environmental factors like air, water, soil, light, temperature etc. Parasite is an organism which depends on the host for its food and shelter and sometimes, it harms the host in return. It includes fungi, protozoa etc.
So, the correct option is A.
Question 8
1 / -0

Plastic is one of the most harmful ______ waste.

A
Biodegradable

B
Non-biodegradable

C
Biotic

D
Abiotic

Solution

The substances which can be easily decomposed by natural decomposers are called biodegradable wastes, such as human and animal excreta, plant wastes, etc. On the other hand, the substances that cannot be decomposed by the natural decomposers and harm the environment are called non-biodegradable, such as plastics, nuclear wastes or radioactive wastes, chemical wastes like DDT, etc. Abiotic is the non-living component of the ecosystem which consists air, water, sunlight, etc. Biotic is the component of an ecosystem which consists of all living things like animals and plants.
Thus, the correct answer is option B.
Question 9
1 / -0

Driving force for an ecosystem is the

A
Biomass

B
Producers

C
Food

D
Energy
Solution
Correct Option: D
Explanation:
An ecosystem is a bunch of communities that consists of living and non-living things and their interactions with one another.
Each ecosystem has 2 components, organic phenomenon, and abiotic components. the organic phenomenon refers to all living organisms in ecology whereas abiotically refers to the non-living things.
Plants utilize solar energy for synthesizing their own food by the process of photosynthesis.
Hence, an ecosystem is driven by Energy.
Question 10
1 / -0

How can you define waste?

A
Unused materials

B
Collected materials

C
Unwanted or unusable materials

D
None of these

Solution

Waste is unwanted or unused materials which are to be discarded or disposed off.
Materials can be collected and unused, but that does not make them waste.
SO, the correct option is C.

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Re-Attempt Weekly Quiz Competition

Our Environment Test - 13

Result

Our Environment Test - 13

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SHARING IS CARING

Question 1

Autotrophs

Primary consumers

Decomposers

Secondary consumers

Solution

Question 2

Nitrogen fixation

Excretion

Photosynthesis

Respiration

Solution

Question 3

Ecologists

Economists

Engineers

Doctors

Solution

Question 4

Three

Two

Four

Five

Solution

Question 5

skin cancer

lung cancer

both $$A$$ and $$B$$

none of the above

Solution

Question 6

Chlorofluorocarbons

$$CO_2$$

$$SO_2$$

none of the above

Solution

Question 7

Light

Air

Parasite

Temperature

Solution

Question 8

Biodegradable

Non-biodegradable

Biotic

Abiotic

Solution

Question 9

Biomass

Producers

Food

Energy

Solution

Question 10

Unused materials

Collected materials

Unwanted or unusable materials

None of these

Solution

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