Ecosystem Test

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Ecosystem Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following terms defines the prefix 'eco'?

A
Ecology

B
Environment

C
Adaptation

D
Exchange

Solution

The word ecosystem was coined by Tansley a British botanist in 1935. Tansley defined ecosystem as a system resulting from the interaction between biotic and abiotic components of the environment. Biotic components include all living components and abiotic components include all physical factors such as weather, atmosphere, soil, etc. present in the surrounding. Hence the prefix 'eco' means environment.
Question 2
1 / -0

The rate at which light energy is converted into chemical energy of organic molecules is

A
Net primary productivity

B
Gross secondary productivity

C
Net secondary productivity

D
Gross primary productivity

Solution

The rate of biomass production is called as productivity. It is expressed in terms of grams per year or kcal per square meter per year. To compare the productivity of different ecosystems, productivity can be divided into gross primary productivity (GPP) and net primary productivity (NPP). Gross primary productivity of an ecosystem is the rate of production of organic matter during photosynthesis, i.e., the rate at which light energy is converted into chemical energy. A considerable amount of GPP is utilised by plants in respiration. Gross primary productivity minus respiration losses (R), is the net primary productivity (NPP).
Question 3
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The two components of an ecosystem are ____________.

A
Biotic and abiotic

B
Plants and animals

C
Weeds and micro-organism

D
Plants and light
Solution
Two main components exist in an ecosystem: Abiotic and biotic.
The abiotic components of any ecosystem are the properties of the environment; the biotic components are the life forms, that occupy a given ecosystem.
Examples of abiotic components are temperature, light, water and natural disturbances.
Examples of biotic components are producers, such as plants and consumers, such as humans.
Hence, the correct answer is option A.
Question 4
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Which of these is a biogeochemical cycle?

A
Water cycle

B
Nitrogen cycle

C
Carbon cycle

D
All of the above
Question 5
1 / -0

Which of the following are the examples of biogeochemical cycle?

A
Nitrogen cycle

B
Krebs cycle

C
Electron cycle

D
All of the above

Solution

A biogeochemical cycle involves biological, geological and chemical factors. The circulation of chemical nutrients like carbon, oxygen, nitrogen, phosphorus, calcium, and water, etc. between biotic and abiotic components of the biosphere is known as a biogeochemical cycle.
So, the correct option is option A.
Question 6
1 / -0

The given pyramid of biomass represents different trophic levels in a terrestrial ecosystem. The producers are represented by level

A
1

B
2

C
3

D
4

E
5

Solution

Pyramid of biomass is the graphical representation to determine the total living material present at each trophic level. Since there is 90% reduction in biomass at each trophic level, producers exhibit maximum biomass in a terrestrial ecosystem. In given pyramid, producers are represented by level 5 exhibiting maximum biomass. Thus, the correct answer is E.
Question 7
1 / -0

What is famous for the constructive and functional unit?

A
Ecosystem

B
Food chain

C
Food web

D
None of these

Solution

An ecosystem is also defined as the structural and functional unit of ecology. It consists of biotic and abiotic components. The organism of a particular ecosystem interacts with the biotic and abiotic components to adapt better in the environment.
So, the correct answer is option A.
Question 8
1 / -0

Rate of storage of organic matter not used by heterotrophs is termed as

A
Net productivity

B
Net primary productivity

C
Gross primary productivity

D
Secondary productivity

Solution

Productivity is also called as the rate of production. It is defined as the amount of organic matter accumulated in a given time. Gross primary productivity is defined as the total rate of photosynthesis including the organic matter used up in respiration in a given time. Net primary productivity is defined as the rate of storage of organic matter not used by heterotrophs. Secondary productivity is defined as the amount of organic matter stored at consumer level.
Thus, the correct answer is 'Net primary productivity.'
Question 9
1 / -0

Graphic representation of biomass relationship between the producers and consumers in an ecosystem is called

A
Trophic level

B
Ecological system

C
Ecological niche

D
Ecological pyramid

Solution

Graphic representation of biomass relationship between the producers and consumers in an ecosystem is called as ecological pyramid. The trophic level is the class of organisms which occupy same place in a food chain. An ecological system or ecosystem is made up of living components like animals, plants and nonliving component like water, air. Ecological niche is a role of a species in an environment.
Thus, the correct answer is 'Ecological pyramid.'
Question 10
1 / -0

Reservior of sulphur is

A
Rocks

B
Oceans

C
Atmosphere

D
Lakes

Solution

Rocks are the reservior of sulphur as the sulphur is present in the form of iron pyrites (FeS2) and gypsum (CaSO4) in rocks.
Thus, the correct answer is option A.

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Ecosystem Test - 17

Result

Ecosystem Test - 17

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SHARING IS CARING

Question 1

Ecology

Environment

Adaptation

Exchange

Solution

Question 2

Net primary productivity

Gross secondary productivity

Net secondary productivity

Gross primary productivity

Solution

Question 3

Biotic and abiotic

Plants and animals

Weeds and micro-organism

Plants and light

Solution

Question 4

Water cycle

Nitrogen cycle

Carbon cycle

All of the above

Question 5

Nitrogen cycle

Krebs cycle

Electron cycle

All of the above

Solution

Question 6

1

2

3

4

5

Solution

Question 7

Ecosystem

Food chain

Food web

None of these

Solution

Question 8

Net productivity

Net primary productivity

Gross primary productivity

Secondary productivity

Solution

Question 9

Trophic level

Ecological system

Ecological niche

Ecological pyramid

Solution

Question 10

Rocks

Oceans

Atmosphere

Lakes

Solution

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