Ecosystem Test

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Ecosystem Test - 76

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Question 1
1 / -0

In plant succession last community is called as

A
Ecotone

B
Climax community

C
Seral community

D
Ecocystem

Solution

As an ecological community develops, it goes through a series of stages called as ecological succession. Succession is a process that usually begins after a significant disturbance or extinction of an existing community. A climax community is an ecological community that has reached the final stage of ecological succession.
Therefore, the correct answer is option B.
Question 2
1 / -0

Which ecological pyramid can never occur in an inverted form?

A
Pyramid of number

B
Pyramid of biomass

C
Pyramid of energy

D
Pyramid of species richess

Solution

Pyramid of energy is always upright, can never be inverted because energy always flows from a particular trophic level to the next trophic level. The number of trophic levels in the grazing food chain is thus restricted as the transfer of energy follows 10 percent law only, according to which, 10 percent of the energy is transferred to each trophic level from the lower trophic level.
Question 3
1 / -0

Ozone hole was first detected over

A
Arctic circle

B
Antartica

C
Equator

D
All of these

Solution

A severe depletion of ozone (ozone hole) in a region of the ozone layer was found particularly over Antarctica The depletion is caused by chlorofluorocarbons and by other compounds like $$CCI_4$$, $$CF_4$$ etc.
Question 4
1 / -0

The correct sequence of plants in a hydrosere is

A
$$Oak \rightarrow Lantana \rightarrow Volvox \rightarrow Hydrilla \rightarrow Pistia \rightarrow Scirpus $$

B
$$Oak \rightarrow Lantana \rightarrow Scirpus \rightarrow Pistia \rightarrow Hydrilla \rightarrow Volvox$$

C
$$Volvox \rightarrow Hydrilla \rightarrow Pistia \rightarrow Scirpus \rightarrow Lantana \rightarrow Oak$$

D
$$Pistia \rightarrow Volva\rightarrow Scirpus\rightarrow Hydrilla \rightarrow Oak \rightarrow Lantana $$

Solution

In primary succession in water, the pioneers are the small phytoplanktons (Volvox). They are replaced with time by free-floating angiosperms (Hydrilla), then by rooted hydrophytes (Pistia), sedges (Scirpus), grasses (Lantana) and finally the trees (Oak). The climax again would be a forest. With time the water body is converted into land. All the succession whether taking place in water or on land, proceeds to a similar climax community the mesic.
Question 5
1 / -0

Which of the following is the most productive ecosystem?

A
Estuary

B
Mountain

C
Desert

D
None of the above
Question 6
1 / -0

In the phosphorus cycle, weathering makes phophate available first to

A
Decomposers

B
Consumers

C
Producers

D
All of the above

Solution

The natural reservoir of phosphorus is rock, which contains phosphorus in the form of phosphates. When rocks are weathered, minute amounts of these phosphates is mixed in soil and are absorbed by the roots of the plants. Herbivores and other animals obtain this element from plants.
So, the correct answer is 'Producers'
Question 7
1 / -0

Highest value in g/m$$^2$$/yr of a grassland ecosystem would be

A
Gross primary production

B
Net primary production

C
Secondary production

D
Tertiary productlon

Solution

Productivity is rate of accumulation of energy containing organic matter by an ecosystem per unit area per unit time. It is of two types primary and secondary. Productivity at producers level is known as primary productivity. It is two types. Gross primary productivity is primary productivity including that amount which is utilized in respiration and other metabolic activities. Net primary productivity (NPP) is primary productivity in excess to that which is utilized in respiration and other metabolic activities. Secondary productivity is productivity at consumers level. Since, gross production includes total production including the amount utilized in respiration and other metabolic activities so it is more than other forms of productivity.
NP = GP Respiration.
Therefore, the correct answer is option A.
Question 8
1 / -0

The rate at which producers in an ecosystem capture and store chemical energy as biomass is called as

A
Gross primary productivity

B
Net primary productivity

C
Net secondary productivity

D
Gross secondary productivity

Solution

Net primary production is the rate at which all the plants in an ecosystem produce the net usable form of energy. Some net primary production goes toward growth and reproduction of primary producers, while some are consumed by herbivores. Gross primary production (GPP) is the amount of chemical energy as biomass that primary producers create in a given length of time. Gross primary productivity is the rate at which photosynthesis or chemosynthesis occurs.
Question 9
1 / -0

In parasitic food chain, the pyramid of number is

A
Inverted

B
Upright

C
Linear

D
Upright and inverted

Solution

In a parasitic food chain, a single plant supports the growth of many herbivores and each herbivore in turn may provide nutrition to several parasites, which support many hyperparasites. Thus, from the producer towards consumers, there is a reverse position, i.e., the number of organisms gradually shows an increase making the pyramid inverted in shape. Thus, the correct answer is option A.
Question 10
1 / -0

The term biocoenosis was coined by

A
Darwin

B
Haeckel

C
Odum

D
Mobius

Solution

The term biocenosis was coined by Karl Mobius in 1877. It describes the interacting organisms living together in a habitat (biotope). Based on the concept of biocenosis, ecological communities can take in various forms zoocenosis for the faunal community, phytocenosis for the flora community and microbiocenosis for the microbial community.
Therefore, the correct answer is option D.

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Re-Attempt Weekly Quiz Competition

Ecosystem Test - 76

Result

Ecosystem Test - 76

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SHARING IS CARING

Question 1

Ecotone

Climax community

Seral community

Ecocystem

Solution

Question 2

Pyramid of number

Pyramid of biomass

Pyramid of energy

Pyramid of species richess

Solution

Question 3

Arctic circle

Antartica

Equator

All of these

Solution

Question 4

$$Oak \rightarrow Lantana \rightarrow Volvox \rightarrow Hydrilla \rightarrow Pistia \rightarrow Scirpus $$

$$Oak \rightarrow Lantana \rightarrow Scirpus \rightarrow Pistia \rightarrow Hydrilla \rightarrow Volvox$$

$$Volvox \rightarrow Hydrilla \rightarrow Pistia \rightarrow Scirpus \rightarrow Lantana \rightarrow Oak$$

$$Pistia \rightarrow Volva\rightarrow Scirpus\rightarrow Hydrilla \rightarrow Oak \rightarrow Lantana $$

Solution

Question 5

Estuary

Mountain

Desert

None of the above

Question 6

Decomposers

Consumers

Producers

All of the above

Solution

Question 7

Gross primary production

Net primary production

Secondary production

Tertiary productlon

Solution

Question 8

Gross primary productivity

Net primary productivity

Net secondary productivity

Gross secondary productivity

Solution

Question 9

Inverted

Upright

Linear

Upright and inverted

Solution

Question 10

Darwin

Haeckel

Odum

Mobius

Solution

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