#1
Which of the following is a greenhouse gas?
Carbon dioxide
ExplanationCarbon dioxide is a well-known greenhouse gas that contributes to global warming.
#2
What is the primary source of energy for most ecosystems?
Sunlight
ExplanationSunlight powers photosynthesis, the fundamental process for energy acquisition in ecosystems.
#3
Which of the following is a renewable energy resource?
Hydropower
ExplanationHydropower harnesses the energy of flowing or falling water, making it a renewable energy source.
#4
What is the term for the process by which plants release water vapor into the atmosphere?
Transpiration
ExplanationTranspiration is the release of water vapor from plant leaves into the atmosphere.
#5
What is the term for the process by which organisms convert light energy into chemical energy?
Photosynthesis
ExplanationPhotosynthesis is the biological process by which green plants and some other organisms use sunlight to synthesize nutrients.
#6
What is the primary component of fossil fuels?
Carbon
ExplanationFossil fuels primarily consist of carbon-rich compounds formed from the remains of ancient plants and animals.
#7
What is the process by which water changes from a liquid to a gas called?
Evaporation
ExplanationEvaporation is the transformation of water from a liquid state to a gaseous state.
#8
Which of the following is not a major component of soil?
Air
ExplanationAir, although present in soil, is not considered a major component compared to minerals, organic matter, and water.
#9
Which of the following pollutants is a primary contributor to acid rain?
Sulfur dioxide
ExplanationSulfur dioxide emissions contribute to the formation of sulfuric acid in the atmosphere, causing acid rain.
#10
What is the term for the process of breaking down rocks into smaller particles by physical or chemical means?
Weathering
ExplanationWeathering encompasses both physical and chemical processes that break down rocks into sediment.
#11
What is the term for the movement of water through the Earth's crust?
Percolation
ExplanationPercolation refers to the movement of water downwards through soil and rock layers.
#12
Which of the following is a major greenhouse gas that is not naturally occurring?
Chlorofluorocarbons (CFCs)
ExplanationCFCs are synthetic compounds widely used in refrigeration and as propellants, contributing to the greenhouse effect.
#13
What is the term for the process by which carbon moves through the atmosphere, hydrosphere, biosphere, and geosphere?
Carbon cycle
ExplanationThe carbon cycle describes the movement of carbon among these Earth reservoirs.
#14
Which of the following is a characteristic of an ecosystem with high biodiversity?
High species diversity
ExplanationHigh biodiversity in an ecosystem indicates a wide variety of species present.
#15
What is the term for the process of converting nitrogen gas into a form that plants can use?
Nitrogen fixation
ExplanationNitrogen fixation is the biological and chemical process by which nitrogen gas is converted into ammonia or other molecules usable by plants.
#16
Which of the following is a consequence of eutrophication?
Hypoxic conditions
ExplanationEutrophication leads to excessive nutrient buildup in water bodies, causing algal blooms and subsequent depletion of oxygen, resulting in hypoxic conditions.
#17
What is the primary cause of ozone depletion in the stratosphere?
Chlorofluorocarbons (CFCs)
ExplanationCFCs are the primary agents responsible for ozone depletion in the stratosphere by releasing chlorine atoms that break down ozone molecules.
#18
Which of the following best describes the process of biological magnification?
The concentration of pollutants as they move up the food chain
ExplanationBiological magnification refers to the increasing concentration of certain substances, such as toxins or pollutants, as they pass up the food chain.