Biodiversity and Its Conservation
Test 4

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following ecosystems has the greatest biodiversity?

Temperate forests
Tropical rainforests
Grasslands
Polar tundra
2

Tropical rainforests possess the greatest biodiversity because of their long evolutionary history, relatively stable environment, and greater availability of solar energy.

Which of the following statements about species diversity is correct?

Species diversity refers to the variety of species present in a given region.
Species diversity includes only animal species.
Species diversity is higher in polar regions than in tropical regions.
Species diversity has no influence on ecosystem stability.
1

Species diversity refers to the variety of species present in a geographical region or ecosystem.

According to NCERT, which taxonomic group has more species than the combined total of fishes, amphibians, reptiles, and mammals?

Insects
Fungi
Birds
Bryophytes
2

NCERT states that fungi comprise more species than the combined total of fishes, amphibians, reptiles, and mammals.

Which of the following statements about genetic diversity is correct?

Genetic diversity is essential for adaptation and survival.
Genetic diversity is unrelated to species survival.
Species with low genetic diversity are more adaptable.
Genetic diversity does not influence disease resistance.
1

Genetic diversity provides the variation necessary for adaptation and long-term survival of populations.

According to NCERT, the logarithmic form of the species-area relationship is:

S = CA
log S = log C + Z log A
S = A²
log A = log S + C
2

When plotted on a logarithmic scale, the species-area relationship becomes a straight line represented by log S = log C + Z log A.

Which of the following statements about the species-area relationship is correct?

Species richness generally increases with increasing area.
Species richness remains constant regardless of area.
Larger areas always support fewer species.
Species richness is unrelated to the size of the area.
1

Alexander von Humboldt observed that species richness increases with increasing explored area, up to a limit.

Which of the following is the most species-rich taxonomic group among animals?

Mammals
Birds
Fishes
Insects
4

Insects constitute more than 70% of all described animal species, making them the most species-rich animal group.

According to NCERT, what is the approximate range of the value of z in the species-area relationship for most taxa within a region?

0.1–0.2
0.6–1.2
1.5–2.0
2.5–3.0
1

For most groups of organisms, the slope (Z) of the species-area relationship lies between 0.1 and 0.2.

According to Robert May, the estimated global number of species is approximately:

1.8 million
5 million
7 million
12 million
3

Robert May estimated the Earth's biodiversity to be about 7 million species, although only about 1.5–1.8 million species have been described.

Which of the following statements is incorrect?

Biodiversity helps maintain ecosystem stability.
Habitat destruction can lead to species extinction.
Biodiversity has no role in ecosystem productivity.
Overexploitation can lead to biodiversity loss.
3

Biodiversity contributes to ecosystem productivity and stability. Habitat loss and fragmentation, overexploitation, alien species invasions, and co-extinctions are the major causes of biodiversity loss described in NCERT.

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