Our Environment Test

Result

Our Environment Test - 19

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

If a non-degradable and fat soluble pollutant, such as DDT enters the food chain, the pollutant

A
magnifies in concentration at each trophic level

B
degrades at first trophic level

C
accumulates in the body fat of organism at first trophic level and does not pass to second trophic level

D
decreases in concentration at each trophic level

Solution

We use several pesticides and other chemicals like DDT, to protect our crops from diseases and pests. These chemicals are either washed down into the soil or into the water bodies. From the soil, these are absorbed by the plants along with water and minerals, and from the water bodies these are taken up by aquatic plants and animals. This is one of the ways in which they enter the food chain. As these chemicals are not degradable, these get accumulated progressively at each trophic level. As human beings occupy the top level in any food chain, the maximum concentration of these chemicals get accumulated in our bodies. This phenomenon is known as biological magnification.
Question 2
1 / -0

The absorption of $$UV$$ radiation by $$O_3$$:

A
protects the inhabitants of our planet from injurious radiation

B
maintains an equilibrium between the concentrations of $$O_2$$ and $$O_3$$

C
makes both the function A and B above effective

D
makes no function effective

Solution

We know that UV-B radiation is very harmful.

The UV light will also destroy ozone and break ozone back down into atomic oxygen (O) and diatomic oxygen ($$O_2$$) Therefore, the ozone layer does a great job filtering UV radiation and this process protects the inhabitants of our planet from injuries radiation and adsorption of UV radiation has maintained the equilibrium between the of oxygen and ozone in the atmosphere.

So, A and B are both effective.

C is the correct answer.
Question 3
1 / -0

Which of the following is associated with biomagnification?

A
SO$$_4$$

B
DDT

C
Sewage

D
All of the above
Solution
- The different trophic level of an ecosystem interacts with each other and they are interdependent on each other.
- Biological magnification is a process where pollutants such as pesticides or heavy metals move up the food chain, passes into rivers or lakes and are consumed by aquatic organisms such as fish, which in turn are eaten by large birds, animals or humans.
- It occurs when the concentration of a substance, such as DDT or mercury, in an organism, exceeds the background concentration of the substance in its diet.
Thus, the correct answer is option B.
Question 4
1 / -0

The maximum energy is stored at which of the following trophic levels of any ecosystem?

A
Producers

B
Herbivores

C
Carnivores

D
Top carnivores
Solution
- In all ecosystems, the first base level of the pyramid will be occupied by producers, while consumers occupy higher trophic levels.
- Energy is lost when it is transferred from one trophic level to the next. Approximately 10% of the stored energy of a trophic level could be transferred to the consumers of the next level.
- The given diagrammatic representation of the tropic levels explains the energy flow in an ecosystem from one tropic leave to another.
Hence, the correct answer is option A.
Question 5
1 / -0

Biodegradable pollutants are the

A
Domestic wastes that can be rapidly decomposed under natural conditions

B
Industrial wastes that can be rapidly decomposed under natural conditions

C
Industrial wastes that can be decomposed under artificial conditions

D
None of the above

Solution

Pollutants are normally classified into two categories - biodegradable and non- biodegradable. The biodegradable pollutants are the domestic wastes, that can be rapidly decomposed under natural conditions. Industrial wastes come under nonbiodegradable pollutants as they can't be decomposed. Hence, option A is correct.
Question 6
1 / -0

If carbon dioxide is withdrawn from the biosphere, which organism would first experience negative effects?

A
Primary consumers

B
Producers

C
Secondary consumers

D
Tertiary consumers

Solution

If carbon dioxide is withdrawn from the biosphere, producers which use carbon dioxide in the process of photosynthesis will start to experience negative effects as they will not be able to produce food. Therefore, the correct answer is option B.
Question 7
1 / -0

For a clean environment, which one of the following is not essential?

A
Producer

B
Consumer

C
Decomposer

D
Plastic

Solution

Producers are the green plants that produce complex carbohydrates, which are consumed by the consumers, that are the herbivores, carnivores and the omnivores.
The decomposers break-down the complex organic substances into simple inorganic substances that go into the soil and are used up once more by the plants.
Thus, these three are essential for maintaining a clean environment and create a balance. If anyone of them goes extinct, the balance in the ecosystem will be disturbed.
On the other hand, plastics are man-made substances that do not participate in the energy flow in organisms and due to their non-biodegradable nature, act as pollutants.
Thus, the correct option is D.
Question 8
1 / -0

Most harmful environmental pollutants are:

A
Biodegradable

B
Corrosive agents

C
Non-biodegradable substances

D
Solid waste
Solution
- Waste that cannot be broken down in the environment is called non-biodegradable.
- Chemicals that are not biodegradable can enter the food chain and harm organisms at higher trophic levels (through biomagnification), for example, pesticides, such as DDT.
- Other non-biodegradable substances like radioactive wastes, lead, mercury, etc. also have adverse effects on the health of all living organisms.
Question 9
1 / -0

Identify the possible link A in the following food chain.
plant $$\rightarrow$$ insect $$\rightarrow$$ frog $$\rightarrow$$ ?$$\rightarrow$$ Eagle

A
Wolf

B
Parrot

C
Rabbit

D
Snake

Solution

A food chain is the sequence of organisms where one depends on others to obtain nutrition. The plant being a producer is the first one in this chain, which is eaten by an insect. The insect is eaten by a frog and 'A' can possibly be a snake, which eats the frog. Snake is then eventually be eaten by an eagle. Hence, the correct answer is option D.
Question 10
1 / -0

Ozone hole is ________.

A
Hole of ozone layers

B
Same concentration of ozone

C
Thining of ozone in stratosphere

D
Increase of ozone in antartic region
Solution
- An ozone hole is a depletion of the ozone layer which is present in the stratosphere region around 26-30kms above the Earth's surface.
- It is caused by chlorofluorocarbons (CFCs) found in air-conditioners, aerosol spray cans, refrigerants, etc.
- CFCs can not be removed in the troposphere and moves in the stratosphere layer where it reacts with ozone, thereby releasing free chlorine atoms and causes the ozone layer to deplete.
Hence, the correct answer is option C.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Our Environment Test - 19

Result

Our Environment Test - 19

Score

-

Rank

-

SHARING IS CARING

Question 1

magnifies in concentration at each trophic level

degrades at first trophic level

accumulates in the body fat of organism at first trophic level and does not pass to second trophic level

decreases in concentration at each trophic level

Solution

Question 2

protects the inhabitants of our planet from injurious radiation

maintains an equilibrium between the concentrations of $$O_2$$ and $$O_3$$

makes both the function A and B above effective

makes no function effective

Solution

Question 3

SO$$_4$$

DDT

Sewage

All of the above

Solution

Question 4

Producers

Herbivores

Carnivores

Top carnivores

Solution

Question 5

Domestic wastes that can be rapidly decomposed under natural conditions

Industrial wastes that can be rapidly decomposed under natural conditions

Industrial wastes that can be decomposed under artificial conditions

None of the above

Solution

Question 6

Primary consumers

Producers

Secondary consumers

Tertiary consumers

Solution

Question 7

Producer

Consumer

Decomposer

Plastic

Solution

Question 8

Biodegradable

Corrosive agents

Non-biodegradable substances

Solid waste

Solution

Question 9

Wolf

Parrot

Rabbit

Snake

Solution

Question 10

Hole of ozone layers

Same concentration of ozone

Thining of ozone in stratosphere

Increase of ozone in antartic region

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.