Our Environment Test

Result

Our Environment Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

Green plants belong to:

A
Second trophic level

B
First trophic level

C
Third trophic level

D
Fourth trophic level

Solution

The first and lowest trophic level contains the producers, green plants. The plants or their products are consumed by the second-level organisms i.e., the herbivores, or plant-eaters. At the third level, primary carnivores, or meat-eaters, eat the herbivores; and at the fourth level, secondary carnivores eat the primary carnivores.
Hence, the correct answer is (B).
Question 2
1 / -0

Choose the set that represents only the biotic components of a habitat.

A
Tiger, Deer. Grass, Soil

B
Rocks, Soil, Plants, Air

C
Sand, Turtle, Crab, Rocks

D
Aquatic plant, Fish, Frog, Insect

Solution

The biotic or living components of a habitat include the plants, animals, decomposers, microflora and fauna.
So, the correct answer is 'Aquatic plant, Fish, Frog, Insect'
Question 3
1 / -0

Earth is protected from UV-radiations by:

A
ozone layer

B
nitrogen layer

C
carbon dioxide

D
oxygen layer

Solution

The ozone layer refers to a region of earth's stratosphere that absorbs most of the sun's ultraviolet (UV) radiation.
It contains high concentration of ozone ($$O_3$$).
Question 4
1 / -0

In Ozone, number of Oxygen atoms are:

A
3

B
2

C
1

D
4

Solution

The chemical formula of ozone is $$O_3$$
Question 5
1 / -0

The vast surface of the earth presents a huge variety of conditions prevailing in different parts.
Choose the correct option for the given statement.

A
True

B
False

C
Ambiguous

D
Data insufficient
Question 6
1 / -0

Which of the following do not undergo composting?

A
Colored paper

B
Kitchen waste

C
Plant wastes

D
Dung

Solution

Kitchen wastes, dung and plant wastes undergo composting to form manure. However, colored paper remains as such and does not. They are recycled.
Hence, the correct option is A.
Question 7
1 / -0

Consider the following statements:
(a) Wastes are of two types, biodegradable and non-biodegradable.
(b) Biodegradable wastes should be separated and kept in blue colour bins for garbage collectors.
(c) Ozone is formed in stratosphere by action of ultraviolet radiations on oxygen.
Which of the above statements are correct?

A
(a) and (b)

B
(b) and (c)

C
(a) and (c)

D
None of the above

Solution

There are two types of wastes viz., biodegradable and non-biodegradable. Biodegradable wastes are the materials that can be easily decomposed by natural agents like microbes. For example, food wastes like vegetables, chicken, fruit peels, paper etc. Non-biodegradable wastes are the materials which can not be decomposed e.g., plastic.
Biodegradable wastes should be separated and kept in the green coloured bins so that they can be recycled and reused.
UV radiations cat on the atmospheric oxygen and make the stratospheric ozone. UV light splits the molecules apart by breaking the bonds between the atoms. A highly reactive free oxygen atom collides with another oxygen molecule to form an ozone molecule.
Question 8
1 / -0

Which one is not dangerous?

A
Bio-pollutants

B
Ozone layer

C
Nuclear blast

D
Deforestation
Solution
- The ozone layer is found in the upper part of the atmosphere called the stratosphere, and it acts as a shield absorbing ultraviolet radiation from the sun.
- UV rays are highly injurious to living organisms and cause various diseases such as skin cancer, cataract, etc.
- Bio-pollutants, nuclear blast, deforestation cause pollution, and thus damage the environment.
So, the correct answer is option B.
Question 9
1 / -0

Which of the following does not belong to the group formed by the others?

A

B

C

D
Question 10
1 / -0

If the primary producers are absent from any ecosystem, which of the following will occur?

A
Herbivores will not be able to survive.

B
Carnivores will not be able to survive.

C
Both herbivores and carnivores will not be able to survive because of the absence of food.

D
No change will take place.

Solution

All consumers are directly or indirectly dependent on producers for food.
For example, herbivores eat plants. If plants are removed, then herbivores will not survive as their source of food will be absent. If herbivores will not survive then carnivores (that eat herbivores) will also not survive.
So, the correct answer is option C.