Biodiversity & Environmental Issues Test

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Biodiversity & Environmental Issues Test - 6

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Weekly Quiz Competition

Question 1
1 / -0.25

Previously how much of the Earth ’s land surface was covered by the tropical rain forests?

A
14 %

B
50 %

C
24 %

D
35 %
Solution
The forests occurring in tropical areas of heavy rainfall are known as tropical rain forests. It has abundant species of wildlife and vegetation.
Previously 14 percent of the Earth ’s land surface was covered by the tropical rain forests.
Question 2
1 / -0.25

Following plants belonging to same genus (Solanum) represent:

A
gamma diversity

B
species diversity

C
community diversity

D
genetic diversity

Solution

Tomato, potato, Brinjal etc. belongs to genus Solanum although they are of diverse forms. This variation in form represent species diversity belonging to same genus.
Question 3
1 / -0.25

What does ‘The Evil Quartet ’describes?

A
An increase in the number of species

B
The decrease in the number of species

C
Mass extinction

D
Formation of the universe

Solution

‘The Evil Quartet ’is the sobriquet used to describe the reasons for the decline in the number of species. The four reasons include Loss of habitat and fragmentation, Over-exploitation of species, Invasion of alien (new) species and Co-extinctions.
Question 4
1 / -0.25

Which of the benefits, wetlands provide?

A
They provide social, economic and environmental beneficiaries.

B
They prevent flood and recharge groundwater.

C
Being rich in nutrients, they provide a diverse and productive ecosystem.

D
All options are correct.

Solution

Wetland provide benefits like prevention from flood and recharge ground water, social, economic and environmental benefits and being rich in nutrients, they provide a diverse and productive ecosystem.
Question 5
1 / -0.25

Out of the following which one will not represent an alternative way to categories ecosystem diversity:

A
population diversity

B
community diversity

C
habitat diversity

D
landscape diversity

Solution

Biodiversity can be classified on the basis of community, habitat and landscape but not on the basis of population of particular species in the biosphere.
Question 6
1 / -0.25

Currently, how much area of the Earth ’s land surface is covered by the tropical rain forests?

A
90 %

B
50 %

C
6 %

D
1 %
Solution
The forests occurring in tropical areas of heavy rainfall are known as tropical rain forests. It has abundant species of wildlife and vegetation.
Currently, 6 percent area of the Earth ’s land surface is covered by the tropical rain forests.
Question 7
1 / -0.25

What are the excess and the unsustainable use of resources called?

A
Over-exploitation

B
Co-extinctions

C
Invasion of alien species

D
Loss of habitat and fragmentation

Solution

The excess and unsustainable use of resources is known as over-exploitation. It is also known as overharvesting. Overexploitation of any kind of resource leads to rapid decline and destruction of that resource that may cause serious damage to the ecosystem.
Question 8
1 / -0.25

If snakes become extinct :
i). The loss will make the bionetwork imbalanced
ii). Their gene pool will be lost forever
iii). Result will be loss of biodiversity

A
only statement i) &iii) are correct.

B
only statement ii) &iii) are correct.

C
only statement iii) is correct.

D
all statements are correct.

Solution

In food chain, each organism has its own role in flow of energy and nutrient cycle. If snakes become extinct the loss will make the biological network imbalanced. Their gene pool will lost forever that results into loss of biodiversity.
Question 9
1 / -0.25

Assertion: The pattern of species diversity on earth is not uniformly distributed.
Reason: Species variation is generally highest in the tropics and decreases towards the poles.

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

The pattern of species diversity on earth is not uniformly distributed. Species variation is generally highest in the tropics and decreases towards the poles due to variation in temperature.
Question 10
1 / -0.25

What happens when alien species are introduced unintentionally or deliberately?

A
Decrease of alien species

B
They turn invasive and cause decline or extinction of indigenous species

C
They turn invasive and cause increase species

D
Increase in habitat
Solution
The unintentional or deliberate introduction of alien (new) species into a habitat cause the aliens to turn invasive and thus causing the decline or extinction of indigenous species.
They can affect all types of organisms (animals, plants, fungi, and microorganisms) and ecosystems.

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Re-Attempt Weekly Quiz Competition

Biodiversity & Environmental Issues Test - 6

Result

Biodiversity & Environmental Issues Test - 6

Score

-

Rank

-

SHARING IS CARING

Question 1

14 %

50 %

24 %

35 %

Solution

Question 2

gamma diversity

species diversity

community diversity

genetic diversity

Solution

Question 3

An increase in the number of species

The decrease in the number of species

Mass extinction

Formation of the universe

Solution

Question 4

They provide social, economic and environmental beneficiaries.

They prevent flood and recharge groundwater.

Being rich in nutrients, they provide a diverse and productive ecosystem.

All options are correct.

Solution

Question 5

population diversity

community diversity

habitat diversity

landscape diversity

Solution

Question 6

90 %

50 %

6 %

1 %

Solution

Question 7

Over-exploitation

Co-extinctions

Invasion of alien species

Loss of habitat and fragmentation

Solution

Question 8

only statement i) &iii) are correct.

only statement ii) &iii) are correct.

only statement iii) is correct.

all statements are correct.

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

Decrease of alien species

They turn invasive and cause decline or extinction of indigenous species

They turn invasive and cause increase species

Increase in habitat

Solution

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