#1
Which organism is responsible for the majority of oxygen production on Earth?
Trees
ExplanationPhotosynthesis by trees releases oxygen.
#2
What is the primary source of energy for most ecosystems?
Sunlight
ExplanationSunlight fuels photosynthesis, the basis of most ecosystems.
#3
What is the term for the process by which plants lose water vapor to the atmosphere?
Transpiration
ExplanationTranspiration is the release of water vapor through plant leaves.
#4
Which of the following is a primary consumer in a food chain?
Herbivore
ExplanationHerbivores feed directly on producers in a food chain.
#5
Which of the following is NOT a primary factor influencing population growth?
Climate change
ExplanationClimate change is a broader environmental phenomenon, not directly tied to population growth.
#6
What is the term for the total mass of living organisms in a given area?
Biomass
ExplanationBiomass represents the collective mass of living organisms in an area.
#7
Which of the following is NOT a greenhouse gas?
Nitrogen
ExplanationNitrogen is not a greenhouse gas; it's the most abundant gas in the atmosphere.
#8
What is an example of a pioneer species in ecological succession?
Lichen
ExplanationLichen is among the first organisms to colonize barren environments.
#9
What is the process by which nitrogen from the atmosphere is converted into a form usable by plants?
Nitrogen fixation
ExplanationNitrogen fixation converts atmospheric nitrogen into a form that plants can utilize.
#10
Which of the following is NOT a component of soil?
Sunlight
ExplanationSunlight is not a component of soil; it's an external factor affecting soil.
#11
Which of the following is an example of a density-independent factor affecting population growth?
Natural disasters
ExplanationNatural disasters affect populations regardless of their density or size.
#12
What is the term for the process by which one community replaces another over time?
Ecological succession
ExplanationEcological succession is the gradual replacement of one community by another.
#13
Which of the following is an example of mutualism?
Bee pollinating a flower
ExplanationBees benefit from nectar while aiding in pollination, benefiting the flower.
#14
What is the term for the variety of different species in an ecosystem?
Biodiversity
ExplanationBiodiversity refers to the richness of species in an ecosystem.
#15
Which of the following is an example of a keystone species?
Wolf
ExplanationWolves, as top predators, exert significant influence on ecosystem structure and function.
#16
Which of the following is a major greenhouse gas?
Carbon dioxide
ExplanationCarbon dioxide is a significant greenhouse gas contributing to global warming.
#17
What is the term for the process by which two or more species evolve in response to changes in each other?
Co-evolution
ExplanationCo-evolution is the reciprocal evolutionary changes between two or more interacting species.