Populations & Ecosystems Test

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Populations & Ecosystems Test - 9

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Weekly Quiz Competition

Question 1
1 / -0.25

If the number of producers in a pond ecosystem is approx 10 million then the number of top carnivore (in million) which it can support may be:

A
20

B
2

C
11

D
50

Solution

In a food chain, number of organisms reduce from producer to carnivores at each trophic levels. So, the number of carnivores will be less than the prouder which is less than 10 million.
Question 2
1 / -0.25

Ecological pyramids does not give any place to :

A
Saprophytes

B
Transducers

C
Predators

D
Parasites

Solution

In ecological pyramids, saprophytes do not have any place even though they play very vital role in ecosystem. This is because ecological pyramids does not take into account same species belonging to two or more trophic levels.
Question 3
1 / -0.25

A more perfect biogeochemical cycle is:

A
Sulphur cycle

B
Carbon cycle

C
Phosphorus cycle

D
Calcium cycle

Solution

Carbon cycle is the most perfect biogeochemical cycle because carbon cycle operates globally. Carbon cycles include atmosphere, lithosphere and hydrosphere all together.
Question 4
1 / -0.25

The characteristic of soils such as soil composition, grain size and aggregation determine the

A
Only percolation rate of soil.

B
Only water holding capacity of the soil.

C
Percolation and water holding capacity of the soil.

D
Neither percolation nor water holding capacity of the soil.

Solution

The characteristic of soils such as soil composition, grain size and aggregation determine the percolation and water holding capacity of the soil. Along with these pH and mineral composition determine the type of vegetation.
Question 5
1 / -0.25

Which of the following is a unit of primary productivity?

A
g

B
g^-2 or kcal m^-2

C
kcal

D
m

Solution

The unit of primary productivity is the weight (g^-2 ) or weight (kcal m^-2 ). The rate at which the solar energy is converted and stored by the producers per unit area over a time period is called primary productivity.
Question 6
1 / -0.25

Exponential growth occurs in the population in which sufficient

A
Water is abundant.

B
Sufficient area is available.

C
Food and other nutrient are available.

D
All of the above.

Solution

Exponential growth occurs in the population in which sufficient food and nutrients are available in sufficient amount. The rate of growth is very fast in this kinds of growth.
Question 7
1 / -0.25

Recourse partitioning is the evolving mechanisms that promote

A
Co-existence rather than exclusion.

B
Co-existence rather than competition.

C
Exclusion rather than competition.

D
All of the these.

Solution

The species facing completion might evolve mechanisms that that promote co-existence rather than exclusion. This mechanism is called resource partitioning.
Question 8
1 / -0.25

Which of the following is an example of catabolism?

A
Breaking down of stones into smaller parts.

B
Decrease in size of mountain.

C
Breakdown of detritus by microbial enzymes.

D
All of the these.

Solution

Breakdown of detritus by microbial enzymes into simple forms is called catabolism in which mass of the organisms decrease without any external reduction is size of the organisms.
Question 9
1 / -0.25

Assertion: If a predator is too efficient and overexploits its prey, then prey might become extinct.
Reason: The predator will also become extinct for lack of food.

A
Assertion is correct but reason is incorrect.

B
Assertion is incorrect but reason is correct.

C
Both assertion and reason are correct.

D
Both assertion and reason are incorrect.

Solution

If a predator is too efficient and overexploits its prey, then prey might become extinct. The predator will also become extinct for lack of food. Therefore, predators in nature are prudent.
Question 10
1 / -0.25

The order of basic processes involved in succession is

A
Nudation->Invasion->competition and co action->reaction->stabilization

B
Nudation->stabilization->competition and co action->Invasion->reaction

C
Invasion->Nudation->competition and co action->Reaction->stabilization

D
Invasion->stabilization->competition and co action->Reaction->nudation

Solution

The order of basic processes involved in succession is

Nudation→Invasion→Competitionandcoordination→reaction→stabilizationNudation→Invasion→Competitionandcoordination→reaction→stabilization

Hence (a) is the correct answer.
Question 11
1 / -0.25

The individual transitional communities to inhabit an area are commonly called as:

A
Climax stages

B
Sere

C
Pioneer communities

D
Seral stages

Solution

In ecological succession, the individual transitional communities to inhibit an area are commonly called seral stage or seral communities that leads to climax communities.
Question 12
1 / -0.25

Primary consumer category in aquatic &/or terrestrial ecosystem will include :

A
Zooplanktons, frog tadpole, snails and tortoise

B
Zooplanktons, frog, grasshoppers and hydra

C
Frog tadpole, goat, bacteria and fungi

D
Water insects, rabbits, frogs and snails

Solution

Primary consumers obtain food from producers or autotrophs. In aquatic ecosystem phytoplankton are main prouder and zooplankton are primary consumers along with frog tadpole , snail and tortoise.
Question 13
1 / -0.25

Examples of local and global nutrient cycles will be:

A
Carbon and phosphorus cycles respectively

B
Carbon and nitrogen cycles respectively

C
Phosphorus and calcium cycles respectively

D
Phosphorus and carbon cycles respectively

Solution

Phosphorus cycle occurs at local level in an ecosystem as it is mainly derived from soil. Carbon cycles occurs through environment and affected by different ecosystem present on earth surface. So, carbon cycle is global in nature.
Question 14
1 / -0.25

Universal non-polluting source of energy is

A
Sun

B
Wind and water

C
Fossils fuels

D
Nuclear energy

Solution

Universal non-polluting source of energy is sun. All the sources of energy are directly and indirectly derived from sun including fossil fuels.
Question 15
1 / -0.25

Earth crust is the reservoir of sedimentary type of nutrients like

A
Nitrogen

B
Phosphorus

C
Carbon dioxide

D
Oxygen

Solution

Earth crust is the reservoir of sedimentary type of nutrients like phosphorus. Atmosphere is the reservoir of gaseous types of cycle like oxygen and nitrogen along with carbon.

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Re-Attempt Weekly Quiz Competition

Populations & Ecosystems Test - 9

Result

Populations & Ecosystems Test - 9

Score

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Rank

-

SHARING IS CARING

Question 1

20

2

11

50

Solution

Question 2

Saprophytes

Transducers

Predators

Parasites

Solution

Question 3

Sulphur cycle

Carbon cycle

Phosphorus cycle

Calcium cycle

Solution

Question 4

Only percolation rate of soil.

Only water holding capacity of the soil.

Percolation and water holding capacity of the soil.

Neither percolation nor water holding capacity of the soil.

Solution

Question 5

g

g-2 or kcal m-2

kcal

m

Solution

Question 6

Water is abundant.

Sufficient area is available.

Food and other nutrient are available.

All of the above.

Solution

Question 7

Co-existence rather than exclusion.

Co-existence rather than competition.

Exclusion rather than competition.

All of the these.

Solution

Question 8

Breaking down of stones into smaller parts.

Decrease in size of mountain.

Breakdown of detritus by microbial enzymes.

All of the these.

Solution

Question 9

Assertion is correct but reason is incorrect.

Assertion is incorrect but reason is correct.

Both assertion and reason are correct.

Both assertion and reason are incorrect.

Solution

Question 10

Nudation->Invasion->competition and co action->reaction->stabilization

Nudation->stabilization->competition and co action->Invasion->reaction

Invasion->Nudation->competition and co action->Reaction->stabilization

Invasion->stabilization->competition and co action->Reaction->nudation

Solution

Question 11

Climax stages

Sere

Pioneer communities

Seral stages

Solution

Question 12

Zooplanktons, frog tadpole, snails and tortoise

Zooplanktons, frog, grasshoppers and hydra

Frog tadpole, goat, bacteria and fungi

Water insects, rabbits, frogs and snails

Solution

g^-2 or kcal m^-2