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.
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- A. Uniform distribution
- B. Clumped distribution
- C. Carrying capacity
- D. Density
Explanation: Option C is correct because carrying capacity refers to the maximum population size that a particular environment can sustainably support…
Correct answer: Carrying capacity- A. Start with primary consumers
- B. Formed from food chain
- C. Stable than food chain
- D. Complex than food chain
Explanation: A food web is a graphical representation of interconnected food chains.
Correct answer: Start with primary consumers- A. Ecosystem and habitat diversity
- B. Species diversity and ecosystem diversity
- C. Species diversity, genetic diversity and ecosystem diversity
- D. Species diversity only
Explanation: c) Species diversity, genetic diversity, and ecosystem diversity:This is the correct answer.
Correct answer: Species diversity, genetic diversity and ecosystem diversity- A. All the environmental factors that determine where an organism lives
- B. All the food webs in an ecosystem
- C. The place where an organism lives
- D. The role that a species fulfills in a community
Explanation: d) The role that a species fulfills in a community:This is the correct definition of niche.
Correct answer: The role that a species fulfills in a community- A. Complete
- B. Incomplete
- C. Almost complete
- D. None of these
Explanation: Ecosystems with abiotic components, producers, consumers, and decomposers are considered as complete ecosystems.
Correct answer: Complete- A. Prevent entry of ultraviolet rays
- B. Prevent rainfall
- C. Prevent heat to escape
- D. All given options are correct
Explanation: Greenhouse gases are gases in Earth's atmosphere that trap heat. They let sunlight pass through the atmosphere, but they prevent the heat…
Correct answer: Prevent heat to escape- A. Prairies
- B. Savana
- C. Boreal
- D. Pampas
Explanation: The Pampas in Argentina are most well known for the great biodiversity in the area.
Correct answer: Pampas- A. Xerosere
- B. Hydrophytes
- C. Halophytes
- D. All
Explanation: Xerarch succession takes place in dry areas and the series progress from xeric to mesic conditions.
Correct answer: Xerosere- A. Physiology
- B. Pulmonology
- C. Morphology
- D. Ecology
Explanation: Option A: Physiology is the study of the functions of living organisms.
Correct answer: Ecology- A. Becomes fast
- B. Slows down
- C. Remains same
- D. None of these
Explanation: A decrease in the number of resources will lead to more competition between the individuals in a population and hence lead to the death of…
Correct answer: Slows down- A. Soil
- B. Atmosphere
- C. Water
- D. Animals
Explanation: d) Animals: This is the correct option. Animals are biotic components of the environment.
Correct answer: Animals- A. Desert.
- B. Littoral.
- C. Profundal.
- D. All of these.
Explanation: The profundal zone is a deep zone of an inland body of freestanding water, such as a lake or a pond, located below the range of effective…
Correct answer: Profundal.- A. Biogeochemical cycles
- B. Bioelement cycles
- C. Biochemical cycles
- D. Geochemical cycles
Explanation: Explanation:The nutrient cycles are primarily referred to as "Biogeochemical cycles" because they involve the cycling of nutrients such as…
Correct answer: Biogeochemical cycles- A. Population
- B. Community ecology
- C. Community
- D. Autecology
Explanation: [A] Correct definition for population[B] Community ecology;community ecology, study of the organisation and functioning of communities…
Correct answer: Population- A. Niche
- B. Ecosystem
- C. Habitat
- D. Biosphere
Explanation: A habitat is a place where an organism makes its home. A habitat meets all the environmental conditions an organism needs to survive.
Correct answer: Habitat- A. Symbiosis
- B. Predation
- C. Commensalism
- D. Parasitism
Explanation: Mycorrhiza is a mutualistic relationship between fungal hyphae and roots of higher plants.
Correct answer: Symbiosis- A. Food Chain
- B. Food Web
- C. Trophic Level
- D. Food Link
Explanation: A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another; the levels in the…
Correct answer: Food Chain- A. Role played by many organisms in an ecosystem
- B. Role played by a dead organism in an ecosystem
- C. Role played by community of microorganisms in their ecosystem
- D. Role played by an organism in its ecosystem
Explanation: The niche of an organism is the role that it plays in a community, especially its living conditions and its interaction with other…
Correct answer: Role played by an organism in its ecosystem- A. Trophic level
- B. Food web
- C. Energy pyramid
- D. Food chain
Explanation: A trophic level refers to a level or a position in a food chain, a food web, or an ecological pyramid.
Correct answer: Trophic level- A. Symbiosis
- B. Parasitism
- C. Commensalism
- D. Predation
Explanation: Symbiosis is the interaction of two dissimilar organisms, in which both organisms benefit from the interaction.
Correct answer: Symbiosis