Ecosystem Test

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Ecosystem Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

The term ecosystem was coined by

A
E.P. Odum

B
A.G. Tansley

C
E. Haeckel

D
E. Warming

Solution

Ecosystem is a segment of biosphere consisting of a community of living beings and the abiotic or physical environment both interacting and exchanging materials between them. Word ecosystem was first coined by Tansley in 1935 and previously the term 'biocoenosis' was used.
Question 2
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What types of the ecological pyramid would be obtained with the following data?

Secondary consumer: 120 g
Primary consumer: 60 g
Primary producer: 10 g

A
Upright pyramid of numbers

B
Inverted pyramid of biomass

C
Upright pyramid of biomass

D
Pyramid of energy
Solution
- Biomass is the amount of living matter present at a trophic level. The inverted biomass pyramid has the least number of primary producers, which supports primary consumers and the secondary consumers are maximum in number.
- The given data follows a trend where the biomass of the primary producer is less than the primary consumer and that of the primary consumer is less than the secondary consumer. So, the given data supports an inverted pyramid. So, the correct answer is option B.
Question 3
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In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?

A
Gross primary productivity is always more than Net primary productivity.

B
Gross primary productivity and Net primary productivity are one and the same.

C
There is no relationship between Gross primary productivity and Net primary productivity.

D
Gross primary productivity is always less than Net primary productivity.

Solution

Gross primary productivity is the total amount of biomass produced by producers. Net primary productivity is the assimilated biomass by the producers that can be passed on to the next trophic level, after being utilized for respiration and lost as heat.
So, the correct answer is 'Gross primary productivity is always more than net primary productivity'.
Question 4
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Which of the following ecological pyramids is generally inverted?

A
Pyramid of numbers in grassland

B
Pyramid of energy

C
Pyramid of biomass in a forest

D
Pyramid of biomass in a sea

Solution

In an aquatic ecosystem, the pyramid of biomass is generally inverted.
So, the correct answer is 'Pyramid of biomass in a sea'
Question 5
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Desert can be converted into a lush green land by planting

A
Terrestrial plant.

B
Mesophytic plant.

C
Halophytes.

D
Psammophytes.

Solution

Psammophytes are those plant, which can easily grow on sand and gravel. So, plantation of these plant can cover a desert into lush green and xerophyte are draught loving plants and can withstand in water scarcely, while halophytes grow on saline soil. Thus, the correct answer is option D.
Question 6
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Given image is one of the types of ecological pyramids. This type represents

A
Pyramid of numbers in a grassland

B
Pyramid of biomass in a fallow land

C
Inverted pyramid of biomass in a lake

D
Energy pyramid in a spring

Solution

Pyramid of biomass is a graphical representation of the amount of organic material (biomass) in grams of dry mass per square metre at trophic levels of a food chain. The given figure shows the inverted pyramid of biomass in a lake as the producers has less biomass than the primary consumer but suddenly the level of biomass decreases in third trophic level.
Therefore, the correct answer is option C.
Question 7
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Keystone species deserve protection because they

A
Are capable of surviving in harsh environmental conditions.

B
Indicate presence of certain minerals in the soil.

C
Have become rare due to overexploitation.

D
Play an important role in supporting other species.
Solution
Correct Option: D
Explanation:
- Keystone species is an adhesive that reserves a habitat together and a large part of them is responsible for the support given to other species.
Hence, keystone species deserve protection because these play an important role in supporting other species.
Question 8
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Biotic succession is caused by

A
Competition among species

B
Occurrence of dieseases

C
Changes in grazing habits

D
Adaptive ability to environmental changes
Question 9
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Cycling of elements in an ecosystem is called as

A
Chemical cycle

B
Geochemical cycle

C
Biogeochemical cycle

D
Geological cycle

Solution

The term biogeochemical cycle is used for exchange or circulation of biogenetic nutrients between living and non living components of biospheres. The biogenetic nutrients are essential elements required by organisms for their body-building and metabolism which are provided by earth and returned to earth after the death of organisms and/or through excreta of animals
So, the correct answer is 'Biogeochemical cycle'
Question 10
1 / -0

In forest ecosystem, pyramid of number is

A
Upright

B
Inverted

C
Any of the two

D
None of the above

Solution

Pyramid of number is a graphical representation of the number of individuals at various trophic levels in a food chain. It is generally upright as a maximum number of organisms occur at the producer level which is followed by the smaller number of herbivores, fewer primary carnivores and still fewer higher levels of carnivores. So, the number of organisms go on decreasing with the increase in each trophic level.
Thus, the correct answer is option A.

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Ecosystem Test - 15

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Ecosystem Test - 15

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SHARING IS CARING

Question 1

E.P. Odum

A.G. Tansley

E. Haeckel

E. Warming

Solution

Question 2

Upright pyramid of numbers

Inverted pyramid of biomass

Upright pyramid of biomass

Pyramid of energy

Solution

Question 3

Gross primary productivity is always more than Net primary productivity.

Gross primary productivity and Net primary productivity are one and the same.

There is no relationship between Gross primary productivity and Net primary productivity.

Gross primary productivity is always less than Net primary productivity.

Solution

Question 4

Pyramid of numbers in grassland

Pyramid of energy

Pyramid of biomass in a forest

Pyramid of biomass in a sea

Solution

Question 5

Terrestrial plant.

Mesophytic plant.

Halophytes.

Psammophytes.

Solution

Question 6

Pyramid of numbers in a grassland

Pyramid of biomass in a fallow land

Inverted pyramid of biomass in a lake

Energy pyramid in a spring

Solution

Question 7

Are capable of surviving in harsh environmental conditions.

Indicate presence of certain minerals in the soil.

Have become rare due to overexploitation.

Play an important role in supporting other species.

Solution

Question 8

Competition among species

Occurrence of dieseases

Changes in grazing habits

Adaptive ability to environmental changes

Question 9

Chemical cycle

Geochemical cycle

Biogeochemical cycle

Geological cycle

Solution

Question 10

Upright

Inverted

Any of the two

None of the above

Solution

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