Exploring Life: Ecosystems and Biodiversity

Which of the following habitats is primarily associated with polar bears?

• Desert

• Arctic

• Rainforest

• Grassland

What role do decomposer microorganisms play in an ecosystem?

• They produce energy through photosynthesis.

• They break down dead organic matter.

• They compete with plants for sunlight.

• They provide shelter for small animals.

Which of the following best describes the term "biodiversity"?

• The variety of different species in a given area.

• The number of individual organisms in a population.

• The genetic similarity within a species.

• The uniformity of ecosystems across the planet.

Which of the following is a primary consumer in a grassland ecosystem?

• Lion

• Grasshopper

• Eagle

• Mushroom

What is the primary function of nitrogen-fixing bacteria in ecosystems?

• They convert nitrogen gas into ammonia.

• They decompose organic matter.

• They produce oxygen through photosynthesis.

• They consume carbon dioxide.

Which of the following ecosystems is known for having the highest biodiversity?

• Tundra

• Desert

• Tropical rainforest

• Savanna

What is the main reason for the importance of biodiversity in ecosystems?

• It increases the aesthetic value of nature.

• It ensures ecosystem stability and resilience.

• It reduces the need for human intervention.

• It limits the spread of diseases.

Which of the following is an example of a mutualistic relationship in an ecosystem?

• A lion hunting a zebra

• Bees pollinating flowers

• A parasite infecting a host

• A tree shading the ground

What is the primary source of energy for most ecosystems on Earth?

• Wind

• Water

• Sunlight

• Geothermal heat

Which of the following is a characteristic of a desert habitat?

• High humidity

• Abundant rainfall

• Extreme temperature variations

• Dense vegetation