Our Environment Test

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Our Environment Test - 30

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following causes bio-magnification?

A
$$ { SO }_{ 2 } $$

B
Mercury

C
DDT

D
Both (b) and (c)

Solution

Biomagnification refers to increase in concentration of toxicant at successive trophic levels. This happens because a toxic substance accumulated by an organism cannot be metabolised or excreted, and is thus passed on to the next higher trophic level. This phenomenon is well-known for mercury and DDT.
Question 2
1 / -0

Which is the correct sequence in context with the least bio-degradable to most bio-degradable material?

A
Bones, Plastic, Paper, Metal Can

B
Paper, Metal Can, Bones, Plastic

C
Plastic, Metal Can, Bones, Paper

D
Plastic, Bones, Paper, Metal Can
Solution
1. Microorganisms can degrade material derived from living matter. Eg- Paper
2. Bones are also derived from living matter, but the composition consists of a large amount of minerals.
3. Metal gets decomposed to its mineral form by the climatic conditions and takes few years.
4. Plastic is the least biodegradable material.
Thus, the correct answer is option C.
Question 3
1 / -0

What will be the effect of an ozone hole?

A
Greenhouse effect

B
Global warning

C
Acid rain

D
Harmful UV rays will reach the Earth's surface, causing damage to the living organisms.

Solution

A layer of ozone around the Earth's atmosphere absorbs the harmful UV rays coming from the sun.
If there is an ozone hole or the density of ozone is less in one area, the harmful UV rays will enter the Earth's atmosphere and cause damage to living organisms. For example, exposure to harmful UV rays can cause cancer in humans.
Question 4
1 / -0

Grass $$\rightarrow$$ Goat $$\rightarrow$$ Man $$\rightarrow$$
In above food chain man is:

A
Top consumer

B
Secondary consumer

C
Primary consumer

D
Producer

Solution

A trophic level is a group of organisms within an ecosystem which occupy the same level in a food chain. Primary producers are usually plants and algae, which perform photosynthesis in order to manufacture their own food source. Primary producers make up the first trophic level. The second trophic level consists of herbivores. Trophic levels three, four, and five consist of carnivores and omnivores. Trophic level three consists of carnivores and omnivores (Example: Man) which eat herbivores; these are the secondary consumers.
So, the correct answer is 'Secondary consumer'.
Question 5
1 / -0

Study the food web in the diagram given below.

The missing organism in this food web of a forest could be a:

A
Deer

B
Hawk

C
Pine tree

D
Wildflower

Solution

The organism missing in the box of the given food chain is feeding on the trees and grasses. So, it is a primary consumer.
A. Deer is a primary consumer feeding on trees and grasses.
B. Hawk is a carnivore. It does not feed on producers directly.
C. Pine tree is a producer.
D. Wildflower is also producer.
Hence, the correct answer is option A- 'Deer'.
Question 6
1 / -0

Butterfly is a _______ consumer.

A
Primary

B
Secondary

C
Tertiary

D
Both A and C

Solution

A butterfly is a primary consumer because it gets its nutrition directly from plants (producers). Most butterflies eat nectar from the plants for their energy. Secondary and tertiary consumers eat other animals for their energy.
So, the correct answer is option A.
Question 7
1 / -0

Food web contains many ______.

A
Primary consumers

B
Secondary producers

C
Trtiary consumers

D
Food chains.
Question 8
1 / -0

Which of the following material is non-biodegradable?

A
Plastic mugs

B
Egg shell

C
Leather belt

D
Rice grains
Solution
- Eggshell leather belts and rice grains are obtained naturally from living organisms and are made of biodegradable components.
- Plastic mugs are synthesized by humans in factors by making artificial polymers using chemicals that ultimately become non-biodegradable. It remains as it is for thousands of years in the same condition.
Thus, the correct answer is 'Plastic mugs.'
Question 9
1 / -0

A group of worms lacking digestive system harbour these bacteria in their tissues and use them as a source of organic molecules. In this unique ecosystem, these specific groups of bacteria are playing the role of?

A
Decomposer only

B
Producer only

C
Primary consumer only

D
Secondary consumers only

Solution

In the group of worms lacking digestive system, the bacteria living in this system are decomposing (breaking down) the food consumed by the worm so as to release organic nutrients that are absorbed by the worm.
So, the correct answer is 'Decomposer only'.
Question 10
1 / -0

A geographical area where different organisms like plants, animals, microorganisms, etc. live together and interact with one another and with their surrounding environment constitutes a/an:

A
Ecosystem

B
Community

C
Both A and B

D
Biosphere
Solution
- An ecosystem is a structural and functional unit of ecology where living organisms interact with one another and their environment.
- The components of environment include abiotic factors such as air, water, soil and biotic factors such as plants, humans, animals, microorganisms.
So, the correct answer is option A.

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Re-Attempt Weekly Quiz Competition

Our Environment Test - 30

Result

Our Environment Test - 30

Score

-

Rank

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SHARING IS CARING

Question 1

$$ { SO }_{ 2 } $$

Mercury

DDT

Both (b) and (c)

Solution

Question 2

Bones, Plastic, Paper, Metal Can

Paper, Metal Can, Bones, Plastic

Plastic, Metal Can, Bones, Paper

Plastic, Bones, Paper, Metal Can

Solution

Question 3

Greenhouse effect

Global warning

Acid rain

Harmful UV rays will reach the Earth's surface, causing damage to the living organisms.

Solution

Question 4

Top consumer

Secondary consumer

Primary consumer

Producer

Solution

Question 5

Deer

Hawk

Pine tree

Wildflower

Solution

Question 6

Primary

Secondary

Tertiary

Both A and C

Solution

Question 7

Primary consumers

Secondary producers

Trtiary consumers

Food chains.

Question 8

Plastic mugs

Egg shell

Leather belt

Rice grains

Solution

Question 9

Decomposer only

Producer only

Primary consumer only

Secondary consumers only

Solution

Question 10

Ecosystem

Community

Both A and B

Biosphere

Solution

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