Levels of Biodiversity Practice Questions
18 free Levels of Biodiversity practice questions for the Zoology. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
What does biodiversity primarily refer to?
- A Number of ecosystems only
- B Variety of life on Earth
- C Only genetic variation
- D Only animal species
Correct answer: Variety of life on Earth
Biodiversity refers to the variety of life at all levels, including genes, species, and ecosystems. It represents the richness and variability of living organisms.
Which level of biodiversity refers to variation within a species?
- A Species diversity
- B Ecosystem diversity
- C Genetic diversity
- D Habitat diversity
Correct answer: Genetic diversity
Genetic diversity refers to differences in genes among individuals of the same species. It allows populations to adapt to changing environments.
Which of the following best describes species diversity?
- A Variation of genes across a population
- B Number and variety of species in an area
- C Types of ecosystems within a region
- D Total number of individuals in a species
Correct answer: Number and variety of species in an area
Species diversity refers to the number and variety of species present in a region. It includes both species richness and evenness.
Which factor increases genetic diversity in a population?
- A Selection
- B Mutation
- C Drift
- D Isolation
Correct answer: Mutation
Mutation introduces new genetic variations into a population. This increases genetic diversity and evolutionary potential.
Which ecosystem is known for having the highest biodiversity?
- A Hot desert
- B Arctic tundra
- C Tropical rainforest
- D Temperate grassland
Correct answer: Tropical rainforest
Tropical rainforests have the highest biodiversity due to favorable climate and abundant resources. They support a wide variety of species.
Which term describes the number of species in a given area?
- A Species evenness
- B Species richness
- C Genetic variation
- D Ecosystem stability
Correct answer: Species richness
Species richness refers to the total number of species present in an area. It is a key component of species diversity.
Which level of biodiversity is most important for adaptation to environmental changes?
- A Species diversity
- B Ecosystem diversity
- C Genetic diversity
- D Community diversity
Correct answer: Genetic diversity
Genetic diversity allows populations to adapt to changing conditions. It increases survival chances under environmental stress.
Which human activity most directly reduces biodiversity?
- A Afforestation
- B Conservation
- C Deforestation
- D Reforestation
Correct answer: Deforestation
Deforestation destroys habitats and reduces species populations. It is a major cause of biodiversity loss.
Which level of biodiversity includes coral reefs, forests, and wetlands?
- A Genetic diversity
- B Species diversity
- C Ecosystem diversity
- D Population diversity
Correct answer: Ecosystem diversity
Ecosystem diversity refers to the variety of ecosystems in a region. Each ecosystem supports different communities of organisms.
Which concept refers to how evenly individuals are distributed among species?
- A Species richness
- B Species evenness
- C Genetic diversity
- D Habitat diversity
Correct answer: Species evenness
Species evenness measures how equally individuals are distributed among species. High evenness indicates balanced populations.
Which region is known as a biodiversity hotspot?
- A Area with low species count and richness
- B Area with only endemic species present
- C Area with no human activity nearby
- D Area with high biodiversity and threat
Correct answer: Area with high biodiversity and threat
Biodiversity hotspots are regions with high species richness and high levels of threat. They are priorities for conservation.
Which level of biodiversity is affected by habitat fragmentation?
- A Genetic diversity
- B Species diversity
- C Ecosystem diversity
- D Community diversity
Correct answer: Genetic diversity
Habitat fragmentation splits populations into smaller, isolated patches, which restricts gene flow and increases inbreeding. This most directly reduces genetic diversity within a species, even though the effects can eventually cascade to species and ecosystem levels as well.
Which type of species contributes most to ecosystem stability?
- A Rare species
- B Dominant species
- C Invasive species
- D Keystone species
Correct answer: Keystone species
Keystone species have a disproportionately large impact on ecosystem structure. Their removal can destabilize ecosystems.
Which process leads to the formation of new species, increasing biodiversity?
- A Extinction
- B Migration
- C Mutation
- D Speciation
Correct answer: Speciation
Speciation is the process by which new species arise. It increases species diversity over time.
Which level of biodiversity is measured by differences in DNA sequences?
- A Species diversity
- B Ecosystem diversity
- C Population diversity
- D Genetic diversity
Correct answer: Genetic diversity
Genetic diversity refers to variation in DNA among individuals. It forms the basis for evolutionary changes.
Which factor is most responsible for the current loss of biodiversity?
- A Natural disasters
- B Seasonal changes
- C Genetic mutations
- D Human activities
Correct answer: Human activities
Human activities such as deforestation, pollution, and climate change are the main causes of biodiversity loss. They disrupt natural ecosystems.
Which conservation strategy protects biodiversity in natural habitats?
- A In situ conservation
- B Ex situ conservation
- C Artificial selection
- D Hybridization
Correct answer: In situ conservation
In situ conservation protects species in their natural habitats. It helps maintain ecological balance and biodiversity.
Which level of biodiversity ensures ecosystem resilience to disturbances?
- A High species diversity
- B Low species diversity
- C Single species dominance
- D Low genetic variation
Correct answer: High species diversity
High species diversity increases ecosystem resilience. It allows ecosystems to recover from disturbances and maintain stability.