Ecosystem Test

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Ecosystem Test - 84

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Weekly Quiz Competition

Question 1
1 / -0

What does the given ecological pyramid represented?

A
Inverted pyramid of number in pond

B
Role of decomposers

C
Inverted of pyramid of bio mass in pond

D
Pyramid of biomass in a forest ecosystem

Solution

The pyramid of biomass is defined as the biomass of the species of the food chain present in the form of weight measures. The inverted pyramid is the reverse of the pyramid.
So, the correct option is 'Inverted of the pyramid of biomass in the pond'.
Question 2
1 / -0

For sedimentary type of biogeochemical cycles, the reservoir is

A
atmosphere

B
water

C
earth's crust

D
living organisms

Solution

For the sedimentary type of biogeochemical cycles, the reservoir is earth's crust as the nutrients do not take any gaseous form rather they are either mineralized of immobilized but ultimately return to earth's crust by decomposition, leaching etc.
So, the correct answer is option C, earth's crust.
Question 3
1 / -0

What kind pyramid is represented by the given figure ?

A
pyramid of numbers in a forest ecosystem

B
pyramid of numbers in a parasitic food chain

C
pyramid of biomass in a forest ecosystem

D
It is a wrong pyramid
Solution
Correct Answer-A
Explanation-
A pyramid of numbers is a graphical representation of the number of organisms in each trophic level in an ecosystem.
It shows how many different kinds of organisms are there a particular trophic level.
From this graphical data, one can estimate the bio productivity of each trophic level.
In the given picture, the number of organisms is shown in each level, starting from the bottom to the top, producer, primary consumer, secondary consumer, and tertiary consumer.
Hence, the correct option is the A. pyramid of numbers in a forest.
Question 4
1 / -0

Choose the correct identification for the given stage of succession and is preceded by which stage respectively?

A
Marsh-meadow, Reed-swamp

B
Submerged free floating, Read-swamp

C
Submerged plant, Scrub stage

D
Phytoplankton, Marsh-meadow

Solution

The plants which are submerged in the water are known as submerged free floting plants. The roots are submerged in the water. Nymphoids is example of a submerged plant.
So, the correct option is 'Submerged free floating, Read-swamp'.
Question 5
1 / -0

In "Rivet popper hypothesis " Paul Ebrlich ,the rivets on the wings represents __________ in ecosystem.

A
Key species

B
Exotic species

C
Extinct species

D
Invasive species
Solution
- The Rivet Popper hypothesis given by Paul Ehlrich tries to explain the importance of key species in an ecosystem.
- The hypothesis compares the ecosystem with an aeroplane and the rivets with the species that are joining the parts of the aeroplane/ecosystem together.
- If the passengers start taking out the rivets, then initially there will be no issue in flight but later, the aeroplane will not be capable to maintain its flight.
- Similarly, if the key species are exploited, they would be extinct, which would not harm the ecosystem initially but later, the ecosystem will collapse.
- However, those rivets which are the parts of the wings are more important because they are directly involved with the flight function.
- These rivets on wings are compared to the key species of an ecosystem.
Hence, the correct answer is 'Key Species'.

Question 6

1 / -0

The succession that starts on abandoned crop land is

Primary succession

Xerarch succession

Secondary succession

Hydrarch succession

Solution

Primary succession	It begins in the lifeless areas, which lack soil such as lava affected regions.
Xerarch succession	Plants succession starts on the bare ground or rock, especially in dry regions such as the desert.
Secondary succession	This type of succession takes place in the previously colonized area but has been disturbed or damaged due to natural calamities, e.g. abandoned cropland
Hydrarch succession	Plants succession starts on the shallow water such as ponds.

So, the correct answer is 'Secondary succession'.

Question 7
1 / -0

In an aquatic ecosystem,a student observed that the lowest tier of the biomass,pyramid was much narrower than the rest.The main producers of this ecosystem most likely are:

A
Singles-celled protists

B
aquatic plants

C
grasses

D
all the above.

Solution

The cells of protists are highly organized with a nucleus and specialized cellular machinery called organelles. At one time, simple organisms such as amoebas and single-celled algae. The main produce of the aquatic ecosystem is single-celled protists.
So, the correct option is 'Single-celled protists'.
Question 8
1 / -0

(Net primary production) - (consumption by heterotrophs ) is

A
Net primary productivity

B
Net productivity

C
Gross primary productivity

D
Primary productivity

Solution

Net productivity is defined as the rate of storage of organic matter not used by the heterotrophs or consumers i.e., NPP (Net primary productivity) - consumption by the heterotrophs during the unit time period.
So, the correct answer is 'Net productivity'.
Question 9
1 / -0

The amount of biomass product per unit area over a time period by plants during photosynthesis is called

A
Primary production

B
Net primary production

C
Gross primary production

D
Secondary production

Solution

A.Primary production – The amount of biomass product per unit area over a time period by plant during photosynthesis is called Primary production.

B.Net primary production - s the rate at which all the plants in an ecosystem produce net useful chemical energy; it is equal to the difference between the rate at which the plants in an ecosystem produce useful chemical energy (GPP) and the rate at which they use some of that energy during respiration.

C.Gross primary production - the amount of chemical energy as biomass that primary producers create in a given length of time

D.secondary production - the generation of biomass of heterotrophic (consumer) organisms in a system. This is driven by the transfer of organic material between trophic levels, and represents the quantity of new tissue created through the use of assimilated food.
So, the correct option is ‘ Primary production’.
Question 10
1 / -0

The amount of carbon absorbed in form $$CO_2$$ by $$1$$ hectare of healthy and productive forest in one year is

A
$$30,000Kg$$

B
$$8,000Kg$$

C
$$6\times10^{14}Kg$$

D
$$10,000Kg$$

Solution

Answer is option A i.e. 30,000 kg
Forests absorb the carbon dioxide (also CO2 emitted into the atmosphere from human activities) and convert it through photosynthesis into living mass. A tree can absorb as much as 48 pounds (21.7 kg) of carbon dioxide per year. The typical number of trees per hectare as per spacing between them, ranging from 1000 to 2500 trees per hectare (minimum of 1500 trees per hectare). Given that over 50 percent of biomass in these forests resides in the wood of trees, this would absorb a further 32,550 kg in one year i.e. approximately 30,000 kg.

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Re-Attempt Weekly Quiz Competition

Ecosystem Test - 84

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Ecosystem Test - 84

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SHARING IS CARING

Question 1

Inverted pyramid of number in pond

Role of decomposers

Inverted of pyramid of bio mass in pond

Pyramid of biomass in a forest ecosystem

Solution

Question 2

atmosphere

water

earth's crust

living organisms

Solution

Question 3

pyramid of numbers in a forest ecosystem

pyramid of numbers in a parasitic food chain

pyramid of biomass in a forest ecosystem

It is a wrong pyramid

Solution

Question 4

Marsh-meadow, Reed-swamp

Submerged free floating, Read-swamp

Submerged plant, Scrub stage

Phytoplankton, Marsh-meadow

Solution

Question 5

Key species

Exotic species

Extinct species

Invasive species

Solution

Question 6

Primary succession

Xerarch succession

Secondary succession

Hydrarch succession

Solution

Question 7

Singles-celled protists

aquatic plants

grasses

all the above.

Solution

Question 8

Net primary productivity

Net productivity

Gross primary productivity

Primary productivity

Solution

Question 9

Primary production

Net primary production

Gross primary production

Secondary production

Solution

Question 10

$$30,000Kg$$

$$8,000Kg$$

$$6\times10^{14}Kg$$

$$10,000Kg$$

Solution

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