Biology MCQs Chapter 3 – Biodiversity

Sure, here are 20 multiple-choice questions on the topic of Biodiversity for Class 9 Biology, along with their answers:

1:What is biodiversity?

a) The variety of life forms on Earth

b) The number of species in a specific ecosystem

c) The total biomass of all living organisms

d) The genetic variation within a single species

Answer: a) The variety of life forms on Earth

2:Which of the following is NOT a component of biodiversity?

a) Species diversity

b) Genetic diversity

c) Ecological diversity

d) Human population density

Answer: d) Human population density

3:Which of the following statements about endangered species is true?

a) Endangered species have large populations in their natural habitat.

b) Endangered species are not at risk of extinction.

c) Endangered species have declined significantly in numbers.

d) Endangered species are always found in zoos and protected areas.

Answer: c) Endangered species have declined significantly in numbers.

4:What is the primary cause of the loss of biodiversity?

a) Natural disasters

b) Pollution

c) Climate change

d) Habitat destruction

Answer: d) Habitat destruction

5:Which of the following is an example of an abiotic factor affecting biodiversity?

a) Predation

b) Temperature

c) Competition

d) Parasitism

Answer: b) Temperature

6:Which level of biodiversity refers to the variety of ecosystems in a region?

a) Species diversity

b) Genetic diversity

c) Ecological diversity

d) Habitat diversity

Answer: c) Ecological diversity

7:Which of the following is NOT a direct use value of biodiversity?

a) Medicinal resources

b) Food sources

c) Ecotourism

d) Aesthetic value

Answer: d) Aesthetic value

8:The variety of different genes present in a population is called:

a) Species diversity

b) Genetic diversity

c) Ecological diversity

d) Habitat diversity

Answer: b) Genetic diversity

9:Which term refers to the process of creating new species over time?

a) Speciation

b) Evolution

c) Extinction

d) Adaptation

Answer: a) Speciation

10:Which of the following is an example of an invasive species causing biodiversity loss?

a) Native bird species adapting to a new habitat

b) Plant species thriving in their natural ecosystem

c) Exotic fish species outcompeting native fish

d) Population decline due to natural selection

Answer: c) Exotic fish species outcompeting native fish

11:Which international treaty aims to conserve biodiversity and ensure its sustainable use?

a) Kyoto Protocol

b) Montreal Protocol

c) Paris Agreement

d) Convention on Biological Diversity (CBD)

Answer: d) Convention on Biological Diversity (CBD)

12:What is the term for the variety of different species within a specific region?

a) Species diversity

b) Genetic diversity

c) Ecological diversity

d) Habitat diversity

Answer: a) Species diversity

13:Which level of biodiversity is essential for the long-term survival of a species?

a) Species diversity

b) Genetic diversity

c) Ecological diversity

d) Ecosystem diversity

Answer: b) Genetic diversity

14:What is the primary role of a seed bank in biodiversity conservation?

a) Rearing endangered animal species

b) Monitoring invasive species

c) Preserving plant genetic diversity

d) Protecting marine ecosystems

Answer: c) Preserving plant genetic diversity

15:Which of the following is an example of a keystone species?

a) A common squirrel in a forest ecosystem

b) A dominant predator in a grassland ecosystem

c) A rare plant species in a desert ecosystem

d) A decomposer in a wetland ecosystem

Answer: b) A dominant predator in a grassland ecosystem

16:Which human activity contributes to the loss of biodiversity in oceans?

a) Sustainable fishing practices

b) Creation of marine reserves

c) Oil spills and pollution

d) Coral reef restoration

Answer: c) Oil spills and pollution

17:Which statement is true about the Red List maintained by the International Union for Conservation of Nature (IUCN)?

a) It classifies endangered species based on their habitat type.

b) It assesses the economic value of different species.

c) It categorizes species based on their conservation status.

d) It only focuses on charismatic animal species.

Answer: c) It categorizes species based on their conservation status.

18:of the following is an example of an ecosystem service provided by biodiversity?

a) Extermination of pests

b) Depletion of soil nutrients

c) Increase in air pollution

d) Pollination of crops

Answer: d) Pollination of crops

19:What is the main purpose of conducting biodiversity assessments in an area?

a) To increase human population in the region

b) To monitor climate change effects

c) To identify invasive species

d) To understand and conserve species diversity

Answer: d) To understand and conserve species diversity

20:What is the term for the variety of different ecosystems on Earth?

a) Species diversity

b) Genetic diversity

c) Ecological diversity

d) Ecosystem diversity

Answer: d) Ecosystem diversity 

           I hope these questions help you with your Class 9 Biology revision!