Biodiversity & Conservation Chapter-Wise Test 13

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which term is used to describe species found only in a particular geographical location?

Exotic species
Endemic species
Keystone species
Indicator species
2

Endemic species are restricted to a particular geographical region and are not naturally found elsewhere.

Which hypothesis explains why ecosystems with higher species richness tend to be more stable?

Competitive exclusion principle
Rivet popper hypothesis
Island biogeography theory
Gaia hypothesis
2

Paul Ehrlich's rivet popper hypothesis explains that gradual loss of species weakens ecosystem functioning, much like removing rivets weakens an aircraft.

What is the primary cause of the accelerated rate of species extinction in recent times?

Natural disasters
Human activities
Genetic mutations
Plate tectonics
2

Human activities such as habitat loss and fragmentation, overexploitation, alien species invasions, and co-extinctions have greatly accelerated species extinction.

When species richness (S) and area (A) are plotted on a logarithmic scale, the species-area relationship becomes:

A straight line
A parabola
A circle
An exponential curve
1

On a logarithmic scale, the species-area relationship is represented by the equation log S = log C + Z log A, which is a straight line.

How many biodiversity hotspots are recognized in the NCERT textbook?

15
25
34
50
3

The NCERT textbook recognizes 34 biodiversity hotspots worldwide, four of which include regions of India.

Which of the following is NOT a method used for biodiversity conservation?

In situ conservation
Ex situ conservation
Deforestation
Habitat protection
3

Deforestation destroys natural habitats and contributes to biodiversity loss, whereas the other options are conservation approaches.

Who first described the species-area relationship?

Charles Darwin
Alexander von Humboldt
Robert May
Paul Ehrlich
2

Alexander von Humboldt first described the species-area relationship by observing that species richness increases with explored area.

Which of the following is an example of co-extinction?

Extinction of a host plant leading to extinction of its pollinator
Introduction of an alien species
Habitat fragmentation
Overexploitation of a fish population
1

Co-extinction occurs when the extinction of one species results in the extinction of another species that depends on it.

Which of the following is used for cryopreservation in ex situ conservation?

Liquid nitrogen at −196°C
Dry ice at −78°C
Ordinary refrigeration
Deep freezer at −20°C
1

Gametes, spores, and seeds can be preserved in liquid nitrogen at −196°C, a method known as cryopreservation.

Which of the following statements about the Red List is correct?

It is published by IUCN.
It includes only plant species.
It does not classify species according to extinction risk.
It lists only extinct species.
1

The IUCN Red List categorizes species according to their risk of extinction and serves as an important conservation tool.

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