Free Ecosystems MCQs with Answers
69 Ecosystems MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
An ecosystem consists of organisms interacting with one another and with abiotic factors such as light, water, soil and temperature. The topic covers populations and communities, food chains and webs, trophic levels, ecological pyramids, energy flow, nutrient cycles and ecological succession.
Last updated
69 questions · page 4 of 4
- A. Littoral
- B. Limnetic
- C. Profundal
- D. Both "a" and "b"
Explanation: It is the open water zone away from the shore and it extends up to the effective light penetration level.
Correct answer: Limnetic- A. Osmosis
- B. Diffusion
- C. Expansion
- D. Decomposition
Explanation: The swelling of dead bodies in water is primarily due to the process of decomposition.
Correct answer: Decomposition- A. Social ecology
- B. Synecology
- C. Autoecology
- D. Heteroecology
Explanation: Synecology (or community ecology) refers to the study of groups of organisms in relation to their environment.
Correct answer: Synecology- A. Mutualism
- B. Predation
- C. Parasitism
- D. Commensalism
Explanation: The human gut microbiome includes trillions of commensal bacteria that offer substantial benefits to the host, including aiding digestion…
Correct answer: Mutualism- A. Cyanobacteria - primary producer
- B. Grasshopper - primary producer
- C. Fungi - Decomposer
- D. Zooplankton - secondary consumer
Explanation: Zooplankton is a primary consumer NOT a secondary consumer.
Correct answer: Zooplankton - secondary consumer- A. Foliose lichens
- B. Crustose lichens
- C. Fruticose lichens
- D. Climax stage
Explanation: Due to great exposure to the sun and extreme deficiency of water, the first pioneers in the bare rock area are a few simple organisms.
Correct answer: Crustose lichens- A. Always unidirectional
- B. Always bidirectional
- C. In any direction
- D. Always down directional
Explanation: In an ecosystem, energy flows in a unidirectional manner, primarily from producers (such as plants) to consumers (such as herbivores…
Correct answer: Always unidirectional- A. Density
- B. Natality
- C. Mortality
- D. Dispersion
Explanation: Natality refers to the rate at which new individuals are added to a population in a unit of time. It is also known as birth rate.
Correct answer: Natality- A. Sand
- B. Water
- C. Forest floor
- D. Bare rocks
Explanation: Lithosere is a specific type of ecological succession that occurs on bare rocks.
Correct answer: Bare rocks