Questions on Biodiversity
Multiple-Choice Questions: Biodiversity
1. What does the term biodiversity refer to?
A) The number of ecosystems on Earth
B) The variety of life forms in a given area
C) The rate of species extinction
D) The amount of biomass in a region
E) The number of organisms in a food chain
2. Which of the following is not a level of biodiversity?
A) Genetic diversity
B) Species diversity
C) Ecosystem diversity
D) Cellular diversity
E) All are levels of biodiversity
3. Genetic diversity refers to:
A) The variety of habitats in a region
B) Differences in DNA among individuals of the same species
C) The number of species in a community
D) The food sources available
E) The adaptations of a single organism
4. Species diversity measures:
A) The variety of genes within a species
B) The number of ecosystems in a biome
C) The number and relative abundance of species in an area
D) The presence of endangered species
E) The population of the most common species
5. Which biome has the highest biodiversity?
A) Desert
B) Tundra
C) Tropical rainforest
D) Temperate forest
E) Taiga
6. Endemic species are:
A) Found worldwide
B) Non-native to any region
C) Found only in a specific geographic area
D) Invasive everywhere
E) Always endangered
7. Which of the following threatens biodiversity the most?
A) Natural selection
B) Habitat destruction
C) Genetic mutation
D) Seasonal migration
E) Climate variation
8. What is the primary cause of species extinction today?
A) Volcanic activity
B) Genetic drift
C) Human activity
D) Plate tectonics
E) Natural predators
9. Invasive species negatively affect biodiversity because they:
A) Improve native species survival
B) Disrupt local ecosystems and outcompete native species
C) Have no effect
D) Increase ecosystem diversity
E) Are always beneficial
10. Conservation biology aims to:
A) Clone endangered species
B) Study diseases in populations
C) Understand and protect biodiversity
D) Increase pollution resistance
E) Promote urban development
11. What is a biodiversity hotspot?
A) A zoo with many animals
B) A region with low human activity
C) A tropical island
D) An area rich in endemic species and threatened by human activity
E) A region with no endangered species
12. Ecosystem services include:
A) Internet and communication systems
B) Cleaning the atmosphere only
C) Benefits humans gain from ecosystems like clean water, pollination, and food
D) Natural disasters
E) None of the above
13. Which of the following preserves biodiversity?
A) Deforestation
B) Pollution
C) Protected areas and wildlife reserves
D) Overhunting
E) Habitat fragmentation
14. Habitat fragmentation can lead to:
A) Increased biodiversity
B) Decreased reproductive success
C) Species adaptation
D) New habitats
E) Better conservation
15. What role do keystone species play in biodiversity?
A) They are the most common species in an area
B) They are unimportant to ecosystems
C) They have a disproportionately large impact on their environment
D) They are always endangered
E) They only live in deserts
16. Which of the following is an example of genetic diversity?
A) Lions and tigers in a savanna
B) Different breeds of domestic dogs
C) Forests and wetlands in one region
D) Coral reefs with many species
E) All aquatic animals
17. What is the benefit of high biodiversity?
A) Decreased food sources
B) Lower environmental stability
C) Greater resilience to environmental changes
D) Reduced ecosystem services
E) Limited genetic variation
18. The loss of pollinators like bees impacts biodiversity by:
A) Increasing plant reproduction
B) Reducing plant diversity and food production
C) Making ecosystems more stable
D) Controlling pests naturally
E) Helping other insects thrive
19. Climate change affects biodiversity by:
A) Strengthening ecosystems
B) Causing mass extinctions and habitat shifts
C) Increasing natural selection
D) Helping species migrate
E) Promoting genetic diversity
20. Ex-situ conservation involves:
A) Protecting species in their natural habitat
B) Preventing pollution in lakes
C) Conservation efforts outside the natural habitat, like zoos and seed banks
D) Monitoring rainfall
E) Cutting down invasive trees
- Questions on Ecological Succession
- Questions on Population Structure and Growth (Ecology)
- Questions ob Demographic Transition (Ecology)
Answer Key with Explanations
1. B – Biodiversity is the variety of life in all forms, levels, and combinations.
2. D – Cellular diversity is not a formal level of biodiversity (genetic, species, ecosystem are).
3. B – Genetic diversity refers to differences in DNA within a species.
4. C – Species diversity includes both the number and relative abundance of species.
5. C – Tropical rainforests are the richest in biodiversity due to stable climates and high productivity.
6. C – Endemic species are unique to a defined geographic location.
7. B – Habitat destruction is the biggest current threat to biodiversity.
8. C – Human actions, such as deforestation and pollution, are leading causes of extinction.
9. B – Invasive species often displace native ones and disrupt ecosystems.
10. C – Conservation biology focuses on understanding and preserving biodiversity.
11. D – Biodiversity hotspots are rich in unique species and face high levels of threat.
12. C – Ecosystem services are essential benefits ecosystems provide to humans.
13. C – Protected areas help maintain habitats and species diversity.
14. B – Fragmentation reduces population sizes and limits reproduction.
15. C – Keystone species play vital roles that affect many other organisms in the ecosystem.
16. B – Different dog breeds are examples of genetic variation within a species.
17. C – High biodiversity contributes to the stability and resilience of ecosystems.
18. B – Without pollinators, many plants cannot reproduce, reducing biodiversity and food supply.
19. B – Climate change alters habitats and can lead to species loss.
20. C – Ex-situ conservation removes species from their habitats to protect them in controlled
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