Biodiversity & Environmental Issues Test

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Biodiversity & Environmental Issues Test - 12

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Weekly Quiz Competition

Question 1
1 / -0.25

Which one of the following fish is being illegally introduced for aquaculture purposes and is posing a threat to the indigenous catfishes of Indian rivers?

A
Clarias gariepinus

B
Nile perch

C
Climbing perch

D
Protopterus

Solution

Clarias gariepinus, the African catifish has been illegally introduced for aquaculture in India. It is threatening native catfishes of Indian rivers.
Question 2
1 / -0.25

When a species becomes extinct, the plant and animal species associated with it in an obligatory way also become extinct. This phenomenon is referred to as

A
Fragmentation

B
Alien species invasion

C
Over-exploitation

D
Co-extinction

Solution

Extinction of one species automatically causes extinction of the other species in certain obligatory mutualistic relationships. This is called co-extinction, e.g., mutualism between Pronuba yuccasella and Yucca.
Question 3
1 / -0.25

Character of a stable community is that it
(a) should not show too much variations in year-to-year productivity
(b) must be resistant to occasional natural or man-made disturbances
(c) should be resistant to invasions by alien species
(d) all of these

A
should not show too much variations in year-to-year productivity

B
must be resistant to occasional natural or man-made disturbances

C
should be resistant to invasions by alien species

D
all of these

Solution

A stable community is self-perpetuating and final biotic community that is in perfect harmony with the physical environment. It does not show much of changes and is usually resilient to natural or man made disturbances. It is also resistant to invasion by alien species.
Question 4
1 / -0.25

Which of the following statements describe natural extinction?
(i) Extinctions abetted by human activities
(ii) Slow replacement of existing species
(iii) Also known as background extinction
(iv) A small population is most likely to be extinct

A
(i) and (ii)

B
(i), (ii) and (iii)

C
(ii), (iii) and (iv)

D
(i), (ii), (iii) and (iv)

Solution

Natural or background extinction is a slow process of replacement of existing species with the better adapted species due to alternate evolution, changes in environmental conditions, predators and diseases. A small population due to inbreeding depression (reduces genetic variability) and normal population fluctuations during unfavourable periods like drought, harsh winter or severe summer.
Question 5
1 / -0.25

Which of the following statements regarding the estimates of number of species found on earth is not correct?

A
Total number of species present on earth are considered to be about 7 million as estimated by Robert May.

B
Plants constitute more than 70% of all the species recorded, whereas animals constitute less than 22% of the total number of species.

C
Insects constitute more than 70% of all the animal species.

D
None of these.

Solution

Animals constitute more than 70% of all the species recorded whereas plants constitute around 22% of total number of species.
Question 6
1 / -0.25

What is the decreasing order of the number of animals species as far as India is concerned?

A
Mammals >Aves >Reptiles,>Amphibians

B
Aves >Reptiles >Mammals >Amphibians

C
Mammals >Reptiles >Amphibians >Aves

D
Reptiles >Amphibians >Mammals >Aves

Solution

The number of species of aves, reptiles, amphibians and mammals are 1232, 456, 209 and 300 respectively.
Question 7
1 / -0.25

How many plant and animal species have been discovered and described so far?

A
1.5 million

B
4.5 million

C
1.5 billion

D
4.5 billion
Solution
The biosphere of Earth is heterogeneous in nature and shows immense diversity.

There are more than slightly more than 1.5 million species known and still many species are yet to be discovered and described.
Question 8
1 / -0.25

Species diversity______as one moves from high to low altitudes.

A
increase

B
decreases

C
first increases then decreases

D
first decreases then increases

Solution

Biodiversity changes with the changes in altitude. It increases as one moves from higher to lower altitudes. Decrease in temperature and greater seasonal variability are the two major factors responsible for lower diversity at higher altitudes.
Question 9
1 / -0.25

What is the total number of species present on earth as estimated by Robert May?

A
3 million

B
5 million

C
7 million

D
9 million

Solution

Robert May estimated that about 7 million species are present on earth.
Question 10
1 / -0.25

India is one of the 12 megadiversity countries of the world and is being divided into______biogeographical regions.

A
8

B
10

C
16

D
18

Solution

India is one of the twelve of the twelve megadiversity regions of the world with 8.1% of genetic resources of the world. Wildlife Insitute of India has divided the country into 10 biogeographical regions-1. Trans-Himalayas, 2. Himalayas, 3. Desert, 4. Semi-arid, 5. Western Ghats, 6. Deccan Peninsula, 7. Gangetic Plain, 8. North East, 9. Coasts, 10. Island.

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Re-Attempt Weekly Quiz Competition

Biodiversity & Environmental Issues Test - 12

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Biodiversity & Environmental Issues Test - 12

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SHARING IS CARING

Question 1

Clarias gariepinus

Nile perch

Climbing perch

Protopterus

Solution

Question 2

Fragmentation

Alien species invasion

Over-exploitation

Co-extinction

Solution

Question 3

should not show too much variations in year-to-year productivity

must be resistant to occasional natural or man-made disturbances

should be resistant to invasions by alien species

all of these

Solution

Question 4

(i) and (ii)

(i), (ii) and (iii)

(ii), (iii) and (iv)

(i), (ii), (iii) and (iv)

Solution

Question 5

Total number of species present on earth are considered to be about 7 million as estimated by Robert May.

Plants constitute more than 70% of all the species recorded, whereas animals constitute less than 22% of the total number of species.

Insects constitute more than 70% of all the animal species.

None of these.

Solution

Question 6

Mammals >Aves >Reptiles,>Amphibians

Aves >Reptiles >Mammals >Amphibians

Mammals >Reptiles >Amphibians >Aves

Reptiles >Amphibians >Mammals >Aves

Solution

Question 7

1.5 million

4.5 million

1.5 billion

4.5 billion

Solution

Question 8

increase

decreases

first increases then decreases

first decreases then increases

Solution

Question 9

3 million

5 million

7 million

9 million

Solution

Question 10

8

10

16

18

Solution

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