Ecosystem Test

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Ecosystem Test - 53

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Weekly Quiz Competition

Question 1
1 / -0

The rate of biomass production and the rate of production of organic matter during photosynthesis are called ___________ respectively.

A
Total productivity and primary production

B
Gross primary productivity and gross secondary productivity

C
Net primary productivity and secondary productivity

D
Productivity, gross primary productivity, net productivity, and gross secondary productivity

Solution

The rate of total biomass production is called as total productivity. The rate of production of organic matter during photosynthesis are called as primary production. The rate of production of organic matter by consumers are called as secondary production.
Thus, the correct answer is 'Total productivity, primary production.'
Question 2
1 / -0

Secondary productivity is rate of formation of new organic matter by

A
Decomposers

B
Producers

C
Parasites

D
Consumers

Solution

In a food chain, energy stored at the producer level is called as primary productivity. Energy stored at the consumer level is called as secondary productivity. In other words, it is the rate of formation of new organic matter by consumers. It is the rate of energy storage at consumer level. Consumer level includes herbivores, carnivores and decomposers. Gross primary productivity is the rate of photosynthesis. Net primary productivity is the rate of storage of organic matter except which is utilized for the respiration by plants.
Thus, the correct answer is 'Consumers.'
Question 3
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Identify the wrong pair of statements
I.During plant succession some species colonise an area and populations becomes more numerous whereas populations of other species decline and even disappear
II.Both hydrarch and xerarch successions lead to mesic conditions
III. Secondary succession is a slow process as compared to primary succession
IV.In successive seral stages there is no change in the diversity of species of organisms

A
II , III

B
I , II

C
III , IV

D
I , III

Solution

Secondary succession usually occurs faster than primary succession due to the presence of the substrate.
In the successive seral stages, there occurs a change in diversity, increase in a number of species, and an increase in total biomass.
So, option III and IV are wrong statements.
So the correct option is C.
Question 4
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In which of the following areas does the primary successions occur ?

A
Abandoned farm land

B
Land which has beed flooded

C
Forest destroyed by fire

D
Newly created pond

Solution

Primary succession occurs only in a bare rock or a newly formed water body.
Question 5
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The removal of keystone species will affect

A
Producers

B
Consumers

C
Ecosystem

D
Decomposers

Solution

Without the keystone species, the ecosystem would be dramatically different or cease to exist altogether. Keystone species have low functional redundancy. This means that if the species were to disappear from the ecosystem, no other species would be able to fill its ecological niche.

So, the correct answer is 'Ecosystem'.
Question 6
1 / -0

Pyramid of energy is always upright. This is in accordance with the law of

A
Thermodynamics

B
Tolerance

C
Limiting factors

D
Evolution

Solution

Flow of energy declines as it passes from lower to higher trophic level. This is explained by second law of thermodynamics. According to this law, the energy decreases from one trophic level to the next trophic level because energy is lost as metabolic heat during transfer of energy. When food energy passes from producers to herbivores to carnivores, only 10% of energy is transferred from one trophic level to another trophic level. Hence, the pyramid of energy is always upright.
Thus, the correct answer is option A.
Question 7
1 / -0

A biogeochemical cycle without an atmospheric component is

A
Sulphur

B
Nitrogen

C
Phosphorus

D
Carbon

Solution

A biogeochemical cycle is also called as nutrient cycle. It is of various types such as sedimentary cycle, gaseous cycle. Sedimentary cycle consists of weathering of an existing rock followed by the erosion of minerals, transport and deposition. It has earth's crust as the reservoir pool. The sulphur cycle is a sedimentary cycle without an atmospheric component.
Thus, the correct answer is 'Sulphur.'
Question 8
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Pick up the correct option
(a) Primary succession begins in areas where natural communities have been destroyed
(b) Hydrarch succession takes place in water
(c) Climax community is the community that is near equilibrium with immediate environment
(d) In newly cooled lava secondary succession occurs

A
a and b

B
b and c

C
a and d

D
b only

E
a only

Solution

a) Primary succession happens in a bare rock and pond areas whereas the secondary succession occurs in the areas affected by natural calamities.
b) Hydrarch succession occurs only in water areas.
c) When a community becomes stable and is in equilibrium with the environmental conditions, it is called the climax community.
d)The areas such as lava flow in which the soil is incapable of developing sustainable lives undergo primary succession.
So the correct option is B.

Question 9

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	I		II
(a)	Phytoplankton	(i)	Pioneers of succession
(b)	Lichens	(ii)	Grow in shady place
(c)	Sciophtytes	(iii)	Abandoned farmlands
(d)	Secondary succession	(iv)	Lungs of the world

a - iv , b - i , c - iii , d - ii

a - ii , b - i , c - iv , d - iii

a - iv , b - i , c - ii , d - iii

a - ii , b - iii , c - iv , d - i

Solution

Phytoplankton is a diverse group of single-celled organisms capable of performing photosynthesis. They are responsible for a significant portion of the oxygen we breathe and hence called lungs of the world.
Pioneer species are the first species to colonize barren environments or previously biodiverse steady-state ecosystems that have been disrupted, such as by fire. The pioneer species are the first stages of ecological succession. Some lichens grow on rocks without soil, so are the pioneer species, and break down the rocks into soil for plants.
The plants which grow best at lower light intensities are called sciophytes. They have developed many adaptations for displaying their foliage to light. They may be twiners, climbers or epiphytes.
Secondary succession is the series of community changes which take place on a previously colonized, but disturbed or damaged habitat. Examples include areas which have been cleared of existing vegetation such as abandoned farmlands.

Question 10
1 / -0

All successions whether taking place in water or on land proceed to a similar climax community which is

A
Hydric

B
Xeric

C
Mesic

D
None of the above

Solution

Succession that takes place in wetter areas from hydric to the mesic conditions is called hydrarch succession.

Succession that takes place in dry areas from xeric to mesic conditions is called xerarch succession.

Both hydrarch and xerarch successions lead to medium water conditions (mesic) leaving them neither too dry (xeric) nor too wet (hydric).
So the correct option is C.

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Re-Attempt Weekly Quiz Competition

Ecosystem Test - 53

Result

Ecosystem Test - 53

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SHARING IS CARING

Question 1

Total productivity and primary production

Gross primary productivity and gross secondary productivity

Net primary productivity and secondary productivity

Productivity, gross primary productivity, net productivity, and gross secondary productivity

Solution

Question 2

Decomposers

Producers

Parasites

Consumers

Solution

Question 3

II , III

I , II

III , IV

I , III

Solution

Question 4

Abandoned farm land

Land which has beed flooded

Forest destroyed by fire

Newly created pond

Solution

Question 5

Producers

Consumers

Ecosystem

Decomposers

Solution

Question 6

Thermodynamics

Tolerance

Limiting factors

Evolution

Solution

Question 7

Sulphur

Nitrogen

Phosphorus

Carbon

Solution

Question 8

a and b

b and c

a and d

b only

a only

Solution

Question 9

a - iv , b - i , c - iii , d - ii

a - ii , b - i , c - iv , d - iii

a - iv , b - i , c - ii , d - iii

a - ii , b - iii , c - iv , d - i

Solution

Question 10

Hydric

Xeric

Mesic

None of the above

Solution

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