WorksheetsEnvironmental Semester Test
Total questions: 20
Worksheet time: 20mins
Identify the primary source of energy for most ecosystems.
Chemical compounds
The Sun
Heat from the Earth’s core
Wind energy
Identify one example of a population within an ecosystem.
All the rocks in a desert
The number of lions in the African savanna
The air temperature in a rainforest
The amount of water in a lake
Which of the following best describes a stable ecosystem?
An ecosystem with a constant increase in population numbers.
An ecosystem where population numbers fluctuate dramatically.
An ecosystem with relatively consistent numbers and types of organisms.
An ecosystem that experiences frequent natural disasters.
Define the term "ecosystem."
A single organism and its environment
A community of interacting organisms and their physical environment
The climate and weather patterns of a region
The total number of species in a habitat
Which of the following best describes the process of thermal convection in the Earth's mantle?
Heat from the core causes mantle material to rise, cool, and then sink back down.
Cold material sinks in the mantle and becomes heated by the Sun.
Water from the oceans cools the mantle, causing it to solidify.
The crust heats the mantle, causing it to expand and float.
What factors are considered in a model that represents the carrying capacity of an ecosystem?
Food availability
Water supply
Predation
All of the above
Which of the following is a direct impact of deforestation on biodiversity?
Increased levels of oxygen in the atmosphere
Loss of habitat for many species
Improved soil fertility
Increased biodiversity in urban areas
Which of the following factors has most significantly affected the carrying capacity of ecosystems undergoing changes due to human activity?
Deforestation
Urbanization
Pollution
Climate Change
Which of the following best defines carrying capacity in an ecosystem?
The maximum number of individuals of a species that an ecosystem can support
The total biomass of all organisms in an ecosystem
The number of different species in an ecosystem
The amount of resources available in an ecosystem
Define the term "matter cycling" in the context of an ecosystem.
The flow of energy through different trophic levels
The process by which nutrients move through the biotic and abiotic components of an ecosystem
The exchange of gases between the atmosphere and organisms
The conversion of solar energy into chemical energy
Compare the roles of producers, consumers, and decomposers in an ecosystem's energy flow.
Producers convert solar energy into chemical energy; consumers convert chemical energy into heat; decomposers break down organic matter
Consumers produce energy for producers; decomposers consume energy from producers
Producers and decomposers both produce energy; consumers store energy
Decomposers and consumers both convert solar energy into chemical energy
What is the primary source of heat that causes convection currents in the Earth’s mantle?
Solar radiation
Chemical reactions
Radioactive decay
Ocean currents
What is the role of greenhouse gases in Earth's energy systems?
They absorb and re-emit infrared radiation
They block solar radiation from entering the atmosphere
They cause ocean currents to change
They reflect sunlight back into space
Which of the following best describes the process of subduction?
The descent of oceanic crust beneath continental crust
The rising of mantle material to form new crust
The horizontal movement of tectonic plates past each other
The breaking apart of a continental plate
Which of the following is a major factor in the variation of energy flow into Earth's systems?
The position of the Moon
The amount of solar radiation received
The gravitational pull of other planets
The Earth's magnetic field
How do volcanic islands typically form?
By the accumulation of coral reefs
From the upwelling of magma at hotspots
Due to the erosion of continental landmasses
Through the folding of tectonic plates
Which process is primarily responsible for the movement of water from the surface of Earth to the atmosphere?
(a)
How might an invasive species disrupt a stable ecosystem?
By increasing the biodiversity of the ecosystem.
By providing additional food resources for native species.
What role do predators play in maintaining the balance of an ecosystem?
They decrease the biodiversity of the ecosystem.
They control the population of herbivores, preventing overgrazing.
They eliminate all weaker organisms, disrupting the ecosystem.
They have no significant impact on ecosystem balance.
Which of the following is an example of a change that could result in a new ecosystem?
Seasonal temperature variations.
A slight change in rainfall patterns.
Introduction of a new predator species.
Routine migration of birds.
