9th Class Biology Chapter 3 MCQs with Answers

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Grade 9 Biology Chapter 3 Online Quiz

By presenting 3 options to choose from, 9th Class Chapter 3 Quiz which cover a wide range of topics and levels of difficulty, making them adaptable to various learning objectives and preferences. You will have to read all the given answers of 9th Class Questions and Answers and click over the correct answer.

• Test Name: 9th Class Chapter 3 Quiz Practice
• Type: Quiz Test
• Total Questions: 40
• Total Marks: 40
• Time: 40 minutes

Note: Answer of the questions will change randomly each time you start the test. Practice each quiz test at least 3 times if you want to secure high marks. Once you are finished, click the View Results button. If any answer looks wrong to you in Quizzes. simply comment below this post, so that we can update the answer in the quiz section.

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9th Class Biology Ch 3: Biodiversity

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1 / 40

Which of the following is a measure of biodiversity that considers the number of different species and their abundance in a given area?

Shannon Diversity Index

Simpson Diversity Index

Species Richness

2 / 40

What is the main threat to the Amazon rainforest's biodiversity?

Deforestation for agriculture and logging

Lack of water resources

Excessive rainfall

3 / 40

What is the main threat to marine biodiversity?

Climate change

Pollution

Overfishing and habitat destruction

4 / 40

Which factor contributes to the loss of genetic diversity in a population?

Small population size

Rapid reproduction

Large population size

5 / 40

What is the main goal of habitat restoration projects?

To eliminate all non-native species

To return ecosystems to their natural state and enhance biodiversity

To create artificial habitats for specific species

6 / 40

What is the term for the number of different species in a particular area?

Species Richness

Species Evenness

Species Abundance

7 / 40

How does biodiversity contribute to climate regulation?

Only large-scale geological processes regulate climate

Biodiversity has no impact on climate regulation

Plants absorb carbon dioxide and release oxygen, helping regulate the climate

8 / 40

What is the importance of biodiversity in medicine?

Biodiversity has no connection to medicine

Medicine is solely based on synthetic chemicals

Many medicines are derived from plants and other organisms

9 / 40

How does biodiversity contribute to cultural and recreational value?

Diverse ecosystems provide opportunities for aesthetic enjoyment and cultural practices

Only natural landscapes have recreational value

Biodiversity has no cultural value

10 / 40

What is the term for the gradual change in the composition of species in a given area over time?

Ecological disturbance

Ecological succession

Biotic interchange

11 / 40

What is the importance of biodiversity in providing ecosystem services?

Biodiversity only affects aesthetics in ecosystems

Biodiversity contributes to essential services like pollination, water purification, and climate regulation

Biodiversity has no impact on ecosystem services

12 / 40

What is the main threat to the survival of many primates in the wild?

Habitat loss due to deforestation

Overhunting for sport

Predation by larger mammals

13 / 40

What is the purpose of a gene bank or seed bank?

To conserve genetic diversity of plants for future use

To store only seeds of commercially valuable plants

To promote the growth of genetically modified crops

14 / 40

What is the primary cause of the current global biodiversity crisis?

Natural climate fluctuations

Predator-prey relationships

Human activities, such as habitat destruction and pollution

15 / 40

Which of the following is an example of an invasive species?

Native wildflowers in a meadow

Endangered species in a protected area

Zebra mussels in North American waterways

16 / 40

What is the primary cause of the decline in amphibian populations worldwide?

Overhunting

Climate change

Habitat loss and degradation

17 / 40

What is the role of keystone species in an ecosystem?

They are rare and endangered species

They are only found in tropical ecosystems

They have a disproportionately large impact on the community structure

18 / 40

What is the purpose of biodiversity hotspots?

Locations for agriculture expansion

Areas with high levels of species endemism and conservation importance

Areas with low biodiversity

19 / 40

What is the primary driver of coral reef decline globally?

Climate change and coral bleaching

Invasive species

Overfishing

20 / 40

What is the Convention on Biological Diversity (CBD)?

An international treaty to promote conservation and sustainable use of biodiversity

A treaty for climate change mitigation

A domestic law for protecting endangered species

21 / 40

What is the role of corridors in promoting biodiversity conservation?

Provide recreational spaces for humans

Connect fragmented habitats, allowing species to move and maintain gene flow

Isolate populations to prevent interbreeding

22 / 40

What is the term for the variety of different plant and animal species in a given area?

Species Diversity

Ecosystem Diversity

Habitat Diversity

23 / 40

What is the role of pollinators in maintaining biodiversity?

They facilitate the reproduction of flowering plants

They compete with plants for resources

They are irrelevant to plant reproduction

24 / 40

What is the term for the interconnected network of all the planet's ecosystems?

Lithosphere

Biosphere

Hydrosphere

25 / 40

What is the main function of a wildlife corridor?

Provide a space for recreational activities

Isolate populations to prevent interbreeding

Connect fragmented habitats to facilitate species movement

26 / 40

What is the term for the disappearance of a species from its natural habitat?

Extinction

Extinction

Extermination

27 / 40

What is the purpose of captive breeding programs in conservation?

To provide pets for private ownership

To breed and raise endangered species in controlled environments

To create new hybrid species

28 / 40

What is the primary factor influencing the distribution of terrestrial biomes?

Climate, particularly temperature and precipitation

Human activities

Soil composition

29 / 40

What is the IUCN Red List?

A list of species categorized by their risk of extinction

A list of invasive species

A list of protected areas around the world

30 / 40

How does biodiversity contribute to ecosystem resilience?

Ecosystems with fewer species are more resilient

Diverse ecosystems are more adaptable to environmental changes

Biodiversity has no impact on ecosystem resilience

31 / 40

What is the term for the variety of ecosystems on Earth?

Ecosystem Diversity

Landscape Diversity

Biome Diversity

32 / 40

What term describes the variety of genetic information within a species?

Species Diversity

Genetic Diversity

Ecosystem Diversity

33 / 40

Which term refers to the variety of different ecosystems in a particular area?

Habitat Diversity

Landscape Diversity

Biome Diversity

34 / 40

What is biodiversity?

The number of species in a single ecosystem

The total biomass in an ecosystem

The variety of life in a given area

35 / 40

How does biodiversity contribute to food security?

Monocultures are more secure for food production

Diverse ecosystems provide a variety of food sources and genetic resources for crops

Biodiversity has no impact on food security

36 / 40

What is the term for species that are found only in specific regions and nowhere else in the world?

Indicator species

Invasive species

Endemic species

37 / 40

What is the term for the total variety of all living organisms on Earth?

Genetic Diversity

Biological Diversity

Biological Diversity

38 / 40

How does biodiversity contribute to the stability of ecosystems?

Biodiversity has no impact on ecosystem stability

More diverse ecosystems are better able to withstand disturbances

Ecosystems with fewer species are more stable

39 / 40

Which biome is characterized by grasses, scattered trees, and a distinct lack of tall trees?

Savanna

Chaparral

Taiga

40 / 40

Which biome is characterized by low temperatures, permafrost, and a short growing season?

Tundra

Rainforest

Desert

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