Our Environment Test

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Our Environment Test - 29

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Weekly Quiz Competition

Question 1
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Extinction of a species in a food chain is compensated in:

A
Ecological pyramid

B
Food web

C
Food chain

D
Energy pyramid

Solution

A food web is interconnected food chains in an ecosystem. The extinction of a species in a food chain is compensated in a food web. When a particular species in a food chain becomes extinct, it is compensated by the remaining generalized species at the same trophic level.
Thus, the correct answer is option B.
Question 2
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Of the total amount of energy that passes from one trophic level to another, about 10% is

A
Respired and becomes heat

B
Passed out as faeces or urine

C
Stored in the body

D
Recycled to autotrophs

Solution

The trophic level of an organism is the position it occupies in a food chain. When green plants are eaten by primary consumers, a great deal of energy is lost as heat to the environment, some amount goes into digestion and in doing work and the rest goes towards growth and reproduction. An average of 10% of the food eaten is stored in its own body and made available for the next level of consumers.
So, the correct option is option C.
Question 3
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A natural food web contains:

A
Only grazing food chains

B
Several trophic levels

C
Only plants

D
Only carnivorous animals

Solution

Food webs largely define ecosystems, and the trophic levels define the position of organisms within the webs. These trophic levels are not always simple integers, because organisms often feed at more than one trophic level.
So, the correct answer is option B.
Question 4
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Energy flow in an ecosystem, begins with:

A
Omnivores

B
Herbivores

C
Decomposers

D
Producers

Solution

An ecosystem is a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system. Sun is the source of energy fixed by the primary producers, like plants. Primary consumers, like herbivores, absorb most of the stored energy in the plant through digestion, and transform it into the form of energy they need, such as ATP, through respiration. A part of the energy received by primary consumers is converted to body heat (an effect of respiration), which is radiated away and lost from the system. Secondary consumers, on consuming primary consumers, get the remaining energy from primary consumers.
So, the correct option is D.
Question 5
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If we weighed all of the organisms at each level of this food web, which would be the heaviest?

A
Grass and trees

B
Grasshoppers and squirrels

C
Hawks and foxes

D
All levels would weigh the same

Solution

A food web consists of all the food chains in a single ecosystem. Each living thing in an ecosystem is part of multiple food chains. Each food chain is one possible path that energy and nutrients may take as they move through the ecosystem. All of the interconnected and overlapping food chains in an ecosystem make up a food web. An ecosystem cannot support a large number of omnivores without supporting an even larger number of herbivores, and an even larger number of autotrophs and hence the biomass of autotrophs will be the heaviest as it present in abundant amount..
So the correct option is 'grass and trees'.
Question 6
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Which of the following is true about an ecosystem?

A
Energy flow

B
Autotrophs converting solar energy to organic compounds.

C
Decomposers recycling organic matter to inorganic compounds.

D
All of the above

Solution

An ecosystem is a community of living organisms in conjunction with the non-living components of their environment, interacting as a system. The fundamental source of energy in almost all ecosystems is radiant energy from the sun. The autotrophs process the light energy and use the energy stored within the simple carbohydrates to produce the more complex organic compounds. The flow of energy through the ecosystem drives the movement of nutrients within the ecosystem. Decomposers play a key role in many of these cycles, returning nutrients to the soil, water, or air, where they can be used again by the biotic constituents of the ecosystem.
So the correct option is 'All of the above.'
Question 7
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Choose the correct answers from the alternatives given :
Ecosystems are characterized by

A
one way flow of energy through the biotic community of an ecosystem

B
interactions of organisms among themselves and the physical and chemical environment

C
cycling of materials from the abiotic environmnent through the biotic community and back to the abiotic environment

D
All of the above

Solution

The ecosystem is a self-regulatory and self-sustaining structural and functional unit of the biosphere containing a community of living beings and the physical environment, both interacting and exchanging materials between them. In an ecosystem, energy flow is unidirectional. So, the correct option is "all of the above".
Question 8
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Which of the following materials takes the longest time for biodegradation?

A
Cotton

B
Paper

C
Bone

D
Jute

Solution

Among the given options bones will take the longest to get degraded. Bones are composed of proteins (mainly collagen), inorganic minerals (calcium, hydroxyapatite) and organic compounds. The unique structure of collagen protein (one of the most resistant proteins to degradation) gives strength to bones. In addition to this, inorganic ions such as calcium further strengthen the bones.
Question 9
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Which of the following is true about biological magnification?

A
Top predators are harmed the most by toxic environmental chemicals.

B
DDT has spread throughout every ecosystem and is found in almost every organism.

C
The biosphere can regulate the environment and adjust to disruptions.

D
Many nutrients are being removed from agricultural lands and shunted into aquatic ecosystems.

Solution

Biological magnification is the process of accumulation of toxic substances in the living organism as they go up the food chain. Hence, organisms of higher trophic levels will have increased concentrations of toxic substances and will be harmed more.
Top predators being higher up in the food chain are harmed the most by toxic elements.
So, the correct option is 'A'.
Question 10
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Choose the incorrect statement:

A
The Montreal protocol is associated with the control of the emission of ozone-depleting substances.

B
Methane and carbon dioxide are greenhouse gases.

C
Dobson unit is used to measure oxygen content.

D
Use of incinerators is crucial to disposal of hospital wastes.
Solution
Correct Option: C
Explanation:
Dobson unit is the unit of measurement for measuring the thickness of the ozone layer.
The Montreal Protocol is related to the control of emission of substances called Ozone Depleting Substances (ODS).
Greenhouse gases are gases that cause global warming. Examples include methane, carbon dioxide etc.
Incinerators help in the disposal of hospital waste by burning.
Hence, the incorrect statement is option C.

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Re-Attempt Weekly Quiz Competition

Our Environment Test - 29

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Our Environment Test - 29

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SHARING IS CARING

Question 1

Ecological pyramid

Food web

Food chain

Energy pyramid

Solution

Question 2

Respired and becomes heat

Passed out as faeces or urine

Stored in the body

Recycled to autotrophs

Solution

Question 3

Only grazing food chains

Several trophic levels

Only plants

Only carnivorous animals

Solution

Question 4

Omnivores

Herbivores

Decomposers

Producers

Solution

Question 5

Grass and trees

Grasshoppers and squirrels

Hawks and foxes

All levels would weigh the same

Solution

Question 6

Energy flow

Autotrophs converting solar energy to organic compounds.

Decomposers recycling organic matter to inorganic compounds.

All of the above

Solution

Question 7

one way flow of energy through the biotic community of an ecosystem

interactions of organisms among themselves and the physical and chemical environment

cycling of materials from the abiotic environmnent through the biotic community and back to the abiotic environment

All of the above

Solution

Question 8

Cotton

Paper

Bone

Jute

Solution

Question 9

Top predators are harmed the most by toxic environmental chemicals.

DDT has spread throughout every ecosystem and is found in almost every organism.

The biosphere can regulate the environment and adjust to disruptions.

Many nutrients are being removed from agricultural lands and shunted into aquatic ecosystems.

Solution

Question 10

The Montreal protocol is associated with the control of the emission of ozone-depleting substances.

Methane and carbon dioxide are greenhouse gases.

Dobson unit is used to measure oxygen content.

Use of incinerators is crucial to disposal of hospital wastes.

Solution

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