Understanding Life Sciences Quiz

What is the primary mechanism of evolution, according to Darwin's theory?

• Genetic drift

• Natural selection

• Gene flow

• Mutation

Which process do plants use to convert carbon dioxide and water into glucose and oxygen, using sunlight as energy?

• Cellular respiration

• Fermentation

• Photosynthesis

• Chemosynthesis

In a food chain, what trophic level do primary producers occupy?

• First

• Second

• Third

• Fourth

What is the main purpose of cellular respiration in living organisms?

• To produce oxygen

• To produce glucose

• To convert glucose into usable energy

• To absorb nutrients from food

Why is biodiversity important in ecosystems?

• It ensures that ecosystems are less resilient to environmental changes.

• It decreases the productivity of ecosystems.

• It increases the resilience of ecosystems to environmental changes.

• It has no impact on the functioning of ecosystems.

Which of the following best describes natural selection?

• The process by which individuals with beneficial traits reproduce more than others

• The random selection of individuals for reproduction

• The survival and reproduction of the weakest individuals in a population

• The alteration of DNA sequences in an organism

What is the chemical equation for photosynthesis?

Which of the following organisms is typically found at the top of a food chain?

• Herbivores

• Primary producers

• Apex predators

• Decomposers

During which process do plants release oxygen into the atmosphere?

• Cellular respiration

• Photosynthesis

• Fermentation

• Nitrogen fixation

What is the main role of decomposers in an ecosystem?

• To produce oxygen

• To consume living plants

• To break down dead organisms and waste, recycling nutrients

• To serve as primary producers