Ecosystem Test

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Ecosystem Test - 67

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Weekly Quiz Competition

Question 1
1 / -0

The primary producers convert how much energy in the sunlight available to them into NPP?

A
$$10\%$$

B
$$42\%$$

C
$$50\%$$

D
$$1\%$$

Solution

The primary producers convert only $$1\%$$ of the energy in the sunlight available to them into NPP. Out of this, only $$10\%$$ is available for the organisms at the next trophic level.
Question 2
1 / -0

Primary succession starts in an area where ___________________.

A
No living organisms ever exicted

B
All the living organisms that existed there, lost due to any reason

C
No living organism are there

D
Both A and C

Solution

Primary succession is ecological succession that begins in essentially lifeless areas, such as regions in which there is no soil or where the soil is incapable of sustaining life. So, it starts in an area where no living organisms ever excited.
Question 3
1 / -0

Flow of energy is unidirectional in an ecosystem because in each trophic level ______________.

A
Number of consumers is constant.

B
Number of consumers reduces.

C
Loss of energy is more than the amount of available energy.

D
Energy does not revert back to previous trophic levels.
Solution
- Energy flow in an ecosystem is always unidirectional in nature because most of the energy is released at the trophic level in the form of heat and performing metabolic activities.
- Hence 10% is transferred from one trophic level to another.
- This makes the unidirectional flow of energy, which means it does not revert back or reuse, it is lost as heat energy.
So, the correct answer is option D.
Question 4
1 / -0

How many statements are correct
(a) Pyramid of biomass in sea is also generally inverted
(b) Pyramid of energy is never inverted
(c) In terrestrial ecosystem a much larger fraction of energy flows through detritus food chain
(d) Humus is highly resistant to microbial action and undergoes decomposition at an extremely slow rate.

A
One

B
Two

C
Three

D
All of these
Question 5
1 / -0

Net primary productivity (NPP) in an ecosystem is

A
GPP - R = NPP

B
GPP + R = NPP

C
GPP - NPP = R

D
R - NPP = GPP
Solution
Net Primary Productivity or NPP can be defined as the rate of accumulation of biomass or energy.
NPP (Net Primary Productivity) is GPP (Gross Primary Productivity) -R (respiration)
So, the correct answer is 'GPP - R = NPP'
Question 6
1 / -0

How many statements are incorrect regarding succession?
(A) During succession climax community is always mesophytes
(B) Future seral communities can't be predicted
(C) Increases net community productivity
(D) Increases species diversity, Biomass and humus content.
(E) Gradual replacement from long lived to short lived plant.

A
$$1$$

B
$$2$$

C
$$4$$

D
None of the above
Question 7
1 / -0

In ecological succession the climax community is best recognised by the following state.

A
P$$=$$R

B
P$$>$$R

C
P$$<$$R

D
P$$\neq$$R
Question 8
1 / -0

How many statements are incorrect regarding succession ?

A
During succession climax community is always mesophytes

B
Future seral communities can't be predicted

C
Increases net community productivity

D
Increases species diversity, Biomass and humus content.

E
Gradual replacement from long lived to short lived plant
Question 9
1 / -0

Which among the following is not a functional unit of the ecosystem ?

A
Decomposition

B
Nutrient cycling

C
Energy flow

D
Pollution

Solution

Productivity, decomposition, energy flow and nutrient cycling are functional aspects of ecosystem.
Pollution is an effect of human activities and not a natural or functional unit of ecosystem
So, the correct answer is 'Pollution'
Question 10
1 / -0

All the statements are correct regarding ecological succession except

A
It is a random process

B
Species diversity increases as succession proceeds

C
The food chain relationships becomes more complex

D
The role of decomposers becomes more and more important

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Re-Attempt Weekly Quiz Competition

Ecosystem Test - 67

Result

Ecosystem Test - 67

Score

-

Rank

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SHARING IS CARING

Question 1

$$10\%$$

$$42\%$$

$$50\%$$

$$1\%$$

Solution

Question 2

No living organisms ever exicted

All the living organisms that existed there, lost due to any reason

No living organism are there

Both A and C

Solution

Question 3

Number of consumers is constant.

Number of consumers reduces.

Loss of energy is more than the amount of available energy.

Energy does not revert back to previous trophic levels.

Solution

Question 4

One

Two

Three

All of these

Question 5

GPP - R = NPP

GPP + R = NPP

GPP - NPP = R

R - NPP = GPP

Solution

Question 6

$$1$$

$$2$$

$$4$$

None of the above

Question 7

P$$=$$R

P$$>$$R

P$$<$$R

P$$\neq$$R

Question 8

During succession climax community is always mesophytes

Future seral communities can't be predicted

Increases net community productivity

Increases species diversity, Biomass and humus content.

Gradual replacement from long lived to short lived plant

Question 9

Decomposition

Nutrient cycling

Energy flow

Pollution

Solution

Question 10

It is a random process

Species diversity increases as succession proceeds

The food chain relationships becomes more complex

The role of decomposers becomes more and more important

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