#1
Which of the following is an example of a decomposer in an ecosystem?
Fungi
ExplanationFungi break down organic matter into nutrients, playing a crucial role in recycling.
#2
What is the primary source of energy in most ecosystems?
Sunlight
ExplanationSunlight is the key energy source driving photosynthesis and sustaining life in ecosystems.
#3
Which of the following is an abiotic factor in an ecosystem?
Sunlight
ExplanationSunlight, being non-living, is an abiotic factor influencing ecosystems.
#4
What is the term for the variety of life forms in an ecosystem?
Biodiversity
ExplanationBiodiversity refers to the diverse range of species and ecosystems.
#5
Which of the following is NOT a greenhouse gas?
Oxygen
ExplanationOxygen is not a greenhouse gas; common greenhouse gases include carbon dioxide and methane.
#6
What is the term for the process by which organisms convert light energy into chemical energy?
Photosynthesis
ExplanationPhotosynthesis is the vital process where plants convert light energy into chemical energy.
#7
Which of the following is NOT a trophic level in a food chain?
Decomposer
ExplanationDecomposers are not trophic levels but play a critical role in breaking down dead organisms.
#8
Which term describes the relationship where both organisms benefit?
Mutualism
ExplanationMutualism is a symbiotic relationship where both partners gain advantages.
#9
What is the process by which water is continuously exchanged between the atmosphere, land, and water bodies?
Hydrological cycle
ExplanationHydrological cycle involves the continuous movement of water, maintaining balance in ecosystems.
#10
What is the term for the process by which nutrients are returned to the soil from dead organisms?
Decomposition
ExplanationDecomposition recycles nutrients from dead organisms, enriching the soil.
#11
Which of the following best describes a climax community?
A stable, mature community
ExplanationA climax community is a stable and mature ecological community.
#12
Which of the following is an example of a pioneer species?
Moss
ExplanationMosses are among the first organisms to colonize barren environments in primary succession.
#13
What is the term for the maximum population size that a particular environment can sustain?
Carrying capacity
ExplanationCarrying capacity is the limit to which an environment can support a population.
#14
What is the term for the role an organism plays in its ecosystem, including its interactions with other organisms and the environment?
Niche
ExplanationAn organism's niche encompasses its role, interactions, and position in its ecosystem.
#15
Which of the following is an example of a keystone species?
Sea otter
ExplanationSea otters play a crucial role in maintaining the balance of their ecosystem.
#16
What is the term for the process by which a population becomes better suited to its environment over time?
Adaptation
ExplanationAdaptation is the evolutionary process enhancing a population's fitness in its environment.
#17
Which of the following is an example of primary succession?
Colonization of a volcanic island by plants
ExplanationPrimary succession starts in barren areas; plants colonizing a volcanic island is an example.
#18
What is the term for the process by which individuals with advantageous traits are more likely to survive and reproduce?
Natural selection
ExplanationNatural selection is the mechanism driving evolutionary adaptation, favoring traits that enhance survival and reproduction.
#19
Which of the following is an example of secondary succession?
Reforestation after logging
ExplanationSecondary succession occurs in areas with existing soil; reforestation after logging is an example.