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9th Class Biology Chapter 3 MCQs with Answers

9th Class Biology Chapter 3 MCQs

Get ready to enjoy nature with the questions relating to “Biodiversity MCQs,” one of the major subjects for 9th-class biology students. This chapter covers the classification of organisms, importance of biodiversity, and strategies to conserve biodiversity. Take a test on species, ecosystems, and threats to biodiversity with these interesting MCQs that help in exam preparation and clarity of concepts.

Biodiversity refers to the:
a) Number of species in an ecosystem
b) Variety of life forms on Earth
c) Genetic variation within a species
d) All of the above

Answer
d) All of the above

Which of the following is the main threat to biodiversity?
a) Pollution
b) Habitat loss
c) Climate change
d) Overhunting

Answer
b) Habitat loss

Which of the following is an example of an ecosystem with high biodiversity?
a) A desert
b) A rainforest
c) A tundra
d) A grassland

Answer
b) A rainforest

What is the term used to describe the variety of different species within a given area?
a) Ecosystem diversity
b) Genetic diversity
c) Species diversity
d) Habitat diversity

Answer
c) Species diversity

The process by which new species arise from existing species is called:
a) Speciation
b) Evolution
c) Extinction
d) Hybridization

Answer
a) Speciation

Which of the following is an example of an invasive species?
a) A native bird species in its natural habitat
b) A plant species introduced from another country that outcompetes native plants
c) A rare species protected in a nature reserve
d) A keystone species that regulates the ecosystem

Answer
b) A plant species introduced from another country that outcompetes native plants

Which of the following is the primary cause of the current mass extinction event?
a) Volcanic eruptions
b) Asteroid impact
c) Human activities
d) Climate change

Answer
c) Human activities

Which of the following is an example of a keystone species?
a) A predator that controls the population of herbivores
b) A plant species that provides food for many animals
c) A species that is dominant in an ecosystem
d) A rare species that has a significant cultural value

Answer
a) A predator that controls the population of herbivores

Which of the following is a measure of the number of individuals of a species in a given area?
a) Species richness
b) Population density
c) Genetic diversity
d) Endemism

Answer
b) Population density

What is the term used to describe species that are native to a specific region and found nowhere else?
a) Invasive species
b) Endemic species
c) Keystone species
d) Indicator species

Answer
b) Endemic species

Which of the following is a measure of the variety of ecosystems within a geographic area?
a) Genetic diversity
b) Species diversity
c) Ecosystem diversity
d) Habitat diversity

Answer
c) Ecosystem diversity

The loss of biodiversity can result in:
a) Increased ecosystem stability
b) Improved ecosystem resilience
c) Reduced ecosystem services
d) Higher species adaptability

Answer
c) Reduced ecosystem services

Which of the following is a legal and protected area where species and their habitats are preserved?
a) Zoo
b) Nature reserve
c) Farm
d) Factory

Answer
b) Nature reserve

Which of the following is a characteristic of a sustainable ecosystem?
a) High levels of pollution
b) Rapid loss of species
c) Stable population sizes
d) Overexploitation of resources

Answer
c) Stable population sizes

Which of the following is an example of an endangered species?
a) Common house mouse
b) Bald eagle
c) Domestic cat
d) Honeybee

Answer
b) Bald eagle

The process by which two or more species evolve in response to each other over time is called:
a) Coevolution
b) Hybridization
c) Extinction
d) Mutation

Answer
a) Coevolution

The Convention on Biological Diversity (CBD) is an international treaty aimed at:
a) Promoting genetic engineering
b) Protecting biodiversity
c) Encouraging habitat destruction
d) Legalizing hunting of endangered species

Answer
b) Protecting biodiversity

Which of the following is a direct value of biodiversity to humans?
a) Aesthetic and recreational value
b) Regulation of climate
c) Prevention of soil erosion
d) All of the above

Answer
d) All of the above

The variety of different ecosystems on Earth is known as:
a) Genetic diversity
b) Species diversity
c) Ecosystem diversity
d) Biotic diversity

Answer
c) Ecosystem diversity

Which of the following is an example of an ex situ conservation method?
a) Creating national parks
b) Establishing wildlife sanctuaries
c) Breeding endangered species in captivity
d) Implementing fishing regulations

Answer
c) Breeding endangered species in captivity

Which of the following is an example of a critically endangered species?
a) Common squirrel
b) Giant panda
c) European robin
d) African elephant

Answer
b) Giant panda

The loss of a keystone species in an ecosystem can result in:
a) Increased biodiversity
b) Decreased competition among species
c) Disruption of the entire ecosystem
d) Faster adaptation of other species

Answer
c) Disruption of the entire ecosystem

Which of the following is an example of an anthropogenic factor contributing to the loss of biodiversity?
a) Volcanic eruption
b) Earthquake
c) Deforestation
d) Tsunami

Answer
c) Deforestation

The process by which some species reproduce and produce fertile offspring is called:
a) Hybridization
b) Extinction
c) Inbreeding
d) Speciation

Answer
d) Speciation

Which of the following is a measure of the variety of genes within a species?
a) Genetic diversity
b) Species diversity
c) Ecosystem diversity
d) Habitat diversity

Answer
a) Genetic diversity

Which of the following is an example of a genetic resource?
a) A rare species in a nature reserve
b) A diverse ecosystem in a national park
c) A gene that gives resistance to a specific disease
d) A community of organisms in a forest

Answer
c) A gene that gives resistance to a specific disease

Which of the following is a measure of the number of different species in a given area?
a) Genetic diversity
b) Species richness
c) Ecosystem diversity
d) Population density

Answer
b) Species richness

Which of the following is an example of a biotic factor that affects biodiversity?
a) Climate change
b) Habitat destruction
c) Overhunting
d) Earthquake

Answer
c) Overhunting

Which of the following is a measure of the variety of habitats within a geographic area?
a) Genetic diversity
b) Species diversity
c) Ecosystem diversity
d) Habitat diversity

Answer
d) Habitat diversity

Which of the following is an example of a threatened species?
a) African lion
b) Red fox
c) Grey wolf
d) Cheetah

Answer
d) Cheetah

The process by which a species becomes extinct in a specific geographic area but survives elsewhere is called:
a) Speciation
b) Endemism
c) Extinction
d) Hybridization

Answer
b) Endemism

Which of the following is an example of an extinction event in Earth’s history?
a) The rise of Homo sapiens
b) The formation of the Grand Canyon
c) The extinction of dinosaurs
d) The discovery of penicillin

Answer
c) The extinction of dinosaurs

Which of the following is a method of in situ conservation?
a) Establishing botanical gardens
b) Captive breeding of endangered species
c) Creating wildlife reserves
d) Reintroducing species into their natural habitat

Answer
d) Reintroducing species into their natural habitat

What is the term used to describe the variety of different life forms on Earth?
a) Species diversity
b) Genetic diversity
c) Biodiversity
d) Ecosystem diversity

Answer
c) Biodiversity

The Red List, compiled by the International Union for Conservation of Nature (IUCN), assesses the:
a) Genetic diversity of endangered species
b) Population density of different species
c) Conservation status of species
d) Number of ecosystems in a region

Answer
c) Conservation status of species

Which of the following is a measure of the variety of life within an ecosystem?
a) Genetic diversity
b) Species diversity
c) Ecosystem diversity
d) Habitat diversity

Answer
b) Species diversity

Which of the following is an example of an endemic species?
a) Brown bear
b) Bengal tiger
c) Giant panda
d) Komodo dragon

Answer
d) Komodo dragon

Which of the following is an example of an ecosystem service provided by biodiversity?
a) Absorption of greenhouse gases
b) Destruction of natural habitats
c) Overexploitation of resources
d) Invasive species introduction

Answer
a) Absorption of greenhouse gases

The loss of biodiversity can lead to a reduction in the resilience of ecosystems, making them:
a) More vulnerable to change
b) More adaptable to change
c) Less susceptible to pollution
d) Less affected by climate change

Answer
a) More vulnerable to change

Which of the following is an example of a genetic resource?
a) A rainforest ecosystem
b) A rare species in a nature reserve
c) A gene that gives resistance to a specific disease
d) A community of organisms in a grassland

Answer
c) A gene that gives resistance to a specific disease

Which of the following is an example of a hotspot of biodiversity?
a) An area with a high number of invasive species
b) An area with a low number of endemic species
c) An area with a high number of threatened species
d) An area with a low number of ecosystem types

Answer
c) An area with a high number of threatened species

The decline of a keystone species can lead to:
a) Increased biodiversity
b) Improved ecosystem stability
c) Disruption of the entire ecosystem
d) Slower adaptation of other species

Answer
c) Disruption of the entire ecosystem

Which of the following is an example of a species that has a high cultural value but is not endangered?
a) African elephant
b) Red fox
c) Bald eagle
d) Snow leopard

Answer
c) Bald eagle

The conservation status of a species is determined based on its:
a) Population density
b) Genetic diversity
c) Extinction risk
d) Habitat diversity

Answer
c) Extinction risk

Which of the following is a measure of the variety of ecosystems within a specific region?
a) Genetic diversity
b) Species diversity
c) Ecosystem diversity
d) Biotic diversity

Answer
c) Ecosystem diversity

Which of the following is an example of an in situ conservation method?
a) Establishing botanical gardens
b) Captive breeding of endangered species
c) Creating wildlife reserves
d) Reintroducing species into their natural habitat

Answer
d) Reintroducing species into their natural habitat

The variety of different ecosystems, species, and genes within a specific region is called:
a) Species richness
b) Genetic diversity
c) Biodiversity
d) Endemism

Answer
c) Biodiversity

Which of the following is an example of a critically endangered species?
a) Polar bear
b) Black bear
c) Snow leopard
d) California condor

Answer
d) California condor

Which of the following is a direct value of biodiversity to humans?
a) Regulation of climate
b) Habitat destruction
c) Prevention of soil erosion
d) Rapid loss of species

Answer
a) Regulation of climate

The Convention on International Trade in Endangered Species of Wild Fauna and Flora
(CITES) aims to:
a) Promote genetic engineering
b) Protect biodiversity
c) Encourage habitat destruction
d) Legalize hunting of endangered species

Answer
b) Protect biodiversity

Which of the following is a measure of the variety of genes within a specific species?
a) Genetic diversity
b) Species diversity
c) Ecosystem diversity
d) Habitat diversity

Answer
a) Genetic diversity

Which of the following is an example of an extinction event caused by human activities?
a) The formation of the Grand Canyon
b) The extinction of dinosaurs
c) The rise of Homo sapiens
d) The discovery of penicillin

Answer
c) The rise of Homo sapiens

The variety of different species within a specific area is known as:
a) Genetic diversity
b) Species diversity
c) Biodiversity
d) Ecosystem diversity

Answer
b) Species diversity

Which of the following is an example of a threatened species?
a) Giant panda
b) Common squirrel
c) African lion
d) Red fox

Answer
a) Giant panda

The loss of biodiversity can lead to a reduction in the stability of ecosystems, making them:
a) More vulnerable to change
b) More adaptable to change
c) Less affected by pollution
d) Less resilient to climate change

Answer
a) More vulnerable to change

Which of the following is a measure of the number of different species in a specific area?
a) Genetic diversity
b) Species richness
c) Ecosystem diversity
d) Population density

Answer
b) Species richness

The process by which species disappear from Earth is called:
a) Extinction
b) Speciation
c) Endemism
d) Hybridization

Answer
a) Extinction

Which of the following is an example of an endemic species?
a) Bengal tiger
b) Brown bear
c) Giant panda
d) Komodo dragon

Answer
d) Komodo dragon

The variety of different life forms on Earth is known as:
a) Species diversity
b) Genetic diversity
c) Biodiversity
d) Ecosystem diversity

Answer
c) Biodiversity

Which of the following is a measure of the variety of different ecosystems within a specific region?
a) Genetic diversity
b) Species diversity
c) Ecosystem diversity
d) Biotic diversity

Answer
c) Ecosystem diversity

9th Class Biology Chapter 3 Flashcards

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See Also  9th Class Biology Chapter 7 MCQs with Answers

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