Ecosystem Test

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Ecosystem Test - 37

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Weekly Quiz Competition

Question 1
1 / -0

About how much, of net primary productivity of an aquatic ecosystem is eaten and digested by herbivores?

A
1%

B
10%

C
40%

D
90%
Question 2
1 / -0

In a natural ecosystem, the biomass of herbivores will be .......... the biomass of carnivores.

A
Independent of

B
Greater than

C
Lesser than

D
The same as
Question 3
1 / -0

Plant maintains the balance of ......... in the atmosphere.

A
Oxygen

B
Carbon dioxide

C
Oxygen and Carbon dioxide

D
None of these

Solution

Photosynthesis is the process in which autotrophs such as green plants use carbon dioxide and water in presence of sunlight to synthesize nutrients such carbohydrates in the form of glucose and release oxygen. Hence oxygen is returned to the atmosphere by photosynthesis. This oxygen from the atmosphere is taken in by animals for carrying out the process of respiration and carbon dioxide is evolved. This carbon dioxide is used by plants and the same cycle continues. Hence plants maintain the balance of oxygen and carbon dioxide in the atmosphere. Thus the correct answer is option C.
Question 4
1 / -0

In a pyramid _________ constitute the largest number of organisms.

A
Decomposers

B
Consumers

C
Primary consumers (herbivores)

D
Producers
Question 5
1 / -0

Sunlight is present for only a short span of time in

A
Polar regions

B
Subtropical regions

C
Desert regions

D
Himalayan region

Solution

Sunlight is present for only a short span of time in polar regions because the earth's axis is inclined about 23.5 degrees with respect to the plane of the ecliptics. This effect the flora and fauna of a particular region.
So, the correct answer is 'Polar regions'
Question 6
1 / -0

The diagram below represents a biomass pyramid.
Which statement concerning the energy in this pyramid is correct ?

A
The producer organisms contain the least amount of stored energy.

B
Stored energy decreases from consumer 3 to consumer 2.

C
Consumer 3 contains the least amount of stored energy.

D
Stored energy increases from the producer to consumers 1.

Solution

The amount of energy flow decreases with every successive trophic level and only 10% is passed to the next level as useable biological energy and the rest 90% is utilized and stored by the organisms of the previous trophic level and some amount is lost during the transfer. As consumer 3 is at the top therefore will have least amount of stored energy.
So, the correct answer is option C.
Question 7
1 / -0

A biomass pyramid is important because it illustrates

A
The biomass of all organisms at each trophic level in a system

B
The number of trophic levels in a system

C
The number of species in each trophic level

D
How energy flows through a food web

Solution

The pyramid of biomass is a graphical representation that depicts the extent of biomass per unit area within different trophic levels in an ecological system. The bottom level of the representation is usually occupied by the producers whereas the carnivores are shown in the top levels.
So, the correct answer is option A.
Question 8
1 / -0

An ecosystem may be a small or a large sized based on kind of

A
Habit

B
Habitat

C
Components

D
Molecules

Solution

Habitat is the environmental area where particular organisms live. Hence the size of the habitat determines the size of an ecosystem. More the number of the organism more the area will be covered and thus the size of the particular ecosystem increases.
Question 9
1 / -0

In a parasitic food chain, the pyramid of number is

A
Linear

B
Upright

C
Spindle shaped

D
Inverted

Solution

In a parasitic food chain, a single plant supports the growth of many herbivores. Each herbivore may provide nutrition to several parasites, which support the growth of many hyperparasites. The number of organisms gradually shows an increase from the producers towards the consumers. This makes the pyramid inverted in shape.
Thus, the correct answer is option D.
Question 10
1 / -0

An ecosystem, such as an aquarium, is self-sustaining if it involves the interaction between organisms, a flow of energy, and the presence of

A
Equal numbers of plants and animals

B
More animals than plants

C
Materials cycles

D
Pioneer organisms

Solution

If a ecosystem such as an ecosystem is to be self-sustaining, materials such as oxygen, carbon dioxide, water and nitrogen must be able to recycle between the organisms.
Therefore, the correct answer is option C.

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Ecosystem Test - 37

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Ecosystem Test - 37

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SHARING IS CARING

Question 1

1%

10%

40%

90%

Question 2

Independent of

Greater than

Lesser than

The same as

Question 3

Oxygen

Carbon dioxide

Oxygen and Carbon dioxide

None of these

Solution

Question 4

Decomposers

Consumers

Primary consumers (herbivores)

Producers

Question 5

Polar regions

Subtropical regions

Desert regions

Himalayan region

Solution

Question 6

The producer organisms contain the least amount of stored energy.

Stored energy decreases from consumer 3 to consumer 2.

Consumer 3 contains the least amount of stored energy.

Stored energy increases from the producer to consumers 1.

Solution

Question 7

The biomass of all organisms at each trophic level in a system

The number of trophic levels in a system

The number of species in each trophic level

How energy flows through a food web

Solution

Question 8

Habit

Habitat

Components

Molecules

Solution

Question 9

Linear

Upright

Spindle shaped

Inverted

Solution

Question 10

Equal numbers of plants and animals

More animals than plants

Materials cycles

Pioneer organisms

Solution

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