Ecosystem Test

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Ecosystem Test - 34

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Weekly Quiz Competition

Question 1
1 / -0

_________ are the cyclic pathways through which chemical elements move from environment to organism and back to the environment.

A
Biogeochemical cycles

B
Geo-chemical cycles

C
Physio-chemical cycles

D
All of the above
Question 2
1 / -0

In order to maintain proper ecological balance

A
The existing forests would be cleared and new ones should be planted

B
Some quick growing annuals should be planted if a tree must be cut for other uses

C
Tree must be cut whenever necessary because the underground part performs the useful purpose

D
A tree should be planted in place of one to be cut
Question 3
1 / -0

In which layer of atmosphere ozone is maximum concentrated?

A
Troposphere

B
Stratosphere

C
Mesosphere

D
Ionosphere

Solution

Ozone layer is a region of concentration of ozone molecule. $$O_3 (O_2 + O)$$ in the earth's atmosphere. The layer lies in the stratosphere at an altitude of 18-50 kms. The ozone layer naturally shields earth's life from the harmful effect of the Sun's ultraviolet radiations.
Question 4
1 / -0

Explain the importance of ozone to mankind.

A
It protects the earth

B
It does not allow the entry of UV light

C
Both A and B

D
Neither A nor B
Question 5
1 / -0

The factors that affect ecological succession are

A
Topography

B
Soil

C
Climate

D
All of the above
Question 6
1 / -0

In grassland ecosystem the pyramid of biomass is

A
Linear

B
Upright

C
Inverted

D
Inverted upright
Question 7
1 / -0

Primary succession begins with

A
ants

B
lichens

C
reptiles

D
algae
Question 8
1 / -0

Source of maximum sulphur in reservoir of sulphur is

A
Ocean

B
Lakes

C
Rocks

D
Both A and C

Solution

The ocean represents a major reservoir of sulphur on earth, with large quantities in the form of dissolved sulphate and sedimentary minerals (e.g., gypsum and pyrite). Sulphate is the most stable form of sulphur on earth; weathering and leaching of rocks and sediments are its main sources to the ocean. The majority of sulphur is found in seawater or sedimentary rocks especially pyrite rich shales and evaporite rocks.
Therefore, the correct answer is option D.
Question 9
1 / -0

Pyramid of numbers in grass ecosystem is

A
Linear

B
Upright

C
Inverted

D
Negative

Solution

In grassland, the producers, which are mainly grasses are always maximum in number. This number then shows a decrease towards the apex, as the primary consumers (herbivores) like rabbits, mice etc. are lesser in number than the grasses; the secondary consumers, snakes and lizards are lesser in number than the herbivores. Finally, the top (tertiary) consumers hawks or other birds are least in number. Thus, the correct answer is option B.
Question 10
1 / -0

Last stage of plant succession is

A
Ecotype

B
Seral community

C
Climax community

D
Ecotone

Solution

An ecological community in which populations of plants or animals remain stable as long as the environment remains unchangeable is called as climax community. It is the final stage of succession, remaining relatively unchanged until destroyed by an event such as fire or human interference. Thus, the correct answer is option C.

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Ecosystem Test - 34

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Ecosystem Test - 34

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SHARING IS CARING

Question 1

Biogeochemical cycles

Geo-chemical cycles

Physio-chemical cycles

All of the above

Question 2

The existing forests would be cleared and new ones should be planted

Some quick growing annuals should be planted if a tree must be cut for other uses

Tree must be cut whenever necessary because the underground part performs the useful purpose

A tree should be planted in place of one to be cut

Question 3

Troposphere

Stratosphere

Mesosphere

Ionosphere

Solution

Question 4

It protects the earth

It does not allow the entry of UV light

Both A and B

Neither A nor B

Question 5

Topography

Soil

Climate

All of the above

Question 6

Linear

Upright

Inverted

Inverted upright

Question 7

ants

lichens

reptiles

algae

Question 8

Ocean

Lakes

Rocks

Both A and C

Solution

Question 9

Linear

Upright

Inverted

Negative

Solution

Question 10

Ecotype

Seral community

Climax community

Ecotone

Solution

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