#1
Which of the following is a primary producer in an ecosystem?
Oak tree
ExplanationPrimary producers create energy from sunlight through photosynthesis.
#2
What is the term used to describe the variety of life forms on Earth?
Biodiversity
ExplanationBiodiversity refers to the richness and variety of life forms on Earth.
#3
Which of the following is NOT a biotic factor in an ecosystem?
Soil
ExplanationSoil is an abiotic factor, not a living organism, in an ecosystem.
#4
What is the term for the process by which water moves from the atmosphere to the Earth's surface?
Precipitation
ExplanationPrecipitation is the process of water falling from the atmosphere to the Earth's surface in various forms such as rain, snow, sleet, or hail.
#5
Which of the following factors contribute to the greenhouse effect?
Carbon dioxide and methane
ExplanationGreenhouse gases like carbon dioxide and methane trap heat in the Earth's atmosphere, contributing to the greenhouse effect.
#6
What is the term for the maximum population size that a given environment can sustain indefinitely?
Carrying capacity
ExplanationCarrying capacity is the maximum population size that an environment can sustainably support.
#7
Which of the following levels of ecological organization is arranged in the correct order from smallest to largest?
Population, Community, Ecosystem, Biosphere
ExplanationPopulation, Community, Ecosystem, and Biosphere represent levels of ecological organization from smallest to largest, respectively.
#8
What is the term for the role or position that an organism has in its environment?
Niche
ExplanationAn organism's niche refers to its specific role or position in its environment.
#9
Which biome is characterized by long, cold winters, short summers, and permafrost?
Taiga
ExplanationTaiga, also known as boreal forest, is characterized by cold climates and coniferous trees.
#10
What is the term for the process by which carbon is exchanged between living organisms and the environment?
Carbon cycle
ExplanationThe carbon cycle is the process by which carbon moves between living organisms, the atmosphere, oceans, and the Earth's crust.
#11
Which of the following is NOT a type of symbiotic relationship?
Predation
ExplanationPredation is a relationship in which one organism kills and consumes another, not a symbiotic relationship.
#12
What is the term for the process by which nitrogen is converted into a form that can be used by plants?
Nitrogen fixation
ExplanationNitrogen fixation is the process by which certain bacteria convert atmospheric nitrogen into ammonia or other compounds that plants can use.
#13
Which of the following is an example of a decomposer?
Mushroom
ExplanationDecomposers like mushrooms break down organic matter into simpler substances, aiding in nutrient recycling.
#14
Which of the following is an example of a keystone species?
Sea otter
ExplanationA keystone species, like the sea otter, plays a crucial role in maintaining the structure and function of its ecosystem.
#15
Which of the following is an example of a pioneer species?
Grass
ExplanationPioneer species like grass are the first to colonize barren environments, initiating ecological succession.
#16
What is the term for the process by which an ecosystem returns to its original state after a disturbance?
Succession
ExplanationSuccession is the process of ecological change over time, leading to the establishment of a stable community after a disturbance.
#17
What is the term for the specific role or job an organism has in its community?
Niche
ExplanationAn organism's niche defines its specific role, including its interactions with other organisms and its environment, within its community.