Worksheets7th Grade Science Final Exam
Total questions: 20
Worksheet time: 10mins
Biodiversity can include genetic diversity within a population or variation of populations within an ecosystem. Given this information, which of the following is likely to have the most biodiversity?
a tropical forest
an arctic tundra
a deciduous forest
a residential backyard
Which of these explains why an ecosystem is healthy when it has a variety of species?
An increased number of species allows for fewer food chains.
A larger number of species reduces competition for abiotic resources.
A larger number of species allows for greater diversity in interdependence.
An increased number of species contributes to greater chances for adaptability.
After a forest fire, which type of organisms will begin secondary succession?
small shrubs
mature oaks
evergreens
wildflowers
A student kept a notebook during an investigation. Which recorded observation
was most likely a physical change?
The solution was heated for two minutes until it boiled.
A solid formed when two liquids were mixed together.
Two solutions were mixed and the resulting solution felt hot.
The color of two mixed solutions changed from clear to white.
A rock has most likely traveled a long distance from its place of origin if it is
very small.
partially faded.
rounded and smooth.
rough and dense.
A certain species of endangered parrots lives on an island that can be seriously affected by large floods. Which of these is considered a negative impact to the parrot population from flooding?
a decrease in the availability of food
a decrease in populations of predators
an increase in suitable nesting locations
an increase in places to hide from danger
According to the Environmental Protection Agency, water is unsafe to drink if nitrate concentrations are above 10 parts per million (ppm). Science students at Concord High tested the water for nitrates in eight private wells. Their results are shown below.
Given the EPA standard, how many of these wells have water that is unsafe to drink?
2
3
4
6
Increased human populations can lead to the depletion of locally available resources within communities. Compared to other communities, which of these locally available resources is most likely to be depleted in desert communities?
mineral
oxygen
gasoline
water
Which gas makes up the greatest percentage of Earth’s atmosphere?
argon
nitrous oxide
nitrogen
carbon dioxide
Scientists noted that muscles and bones would need physical stress to remain healthy during manned space flights. Which of these had to be planned for because of this need?
practicing space walking
counseling activities for tension
exercising to maintain strength
monitoring circadian rhythms
The diagram below shows a cross section of land. Numbers show four zones in this diagram.
Which set of labels below accurately identifies the zones that are shown?
1—groundwater zone; 2—unsaturated zone; 3—water table; 4—surface water
1—unsaturated zone; 2—surface water; 3—groundwater zone; 4—water table
1—water table; 2—surface water; 3—groundwater zone; 4—unsaturated zone
1—unsaturated zone; 2—groundwater zone; 3—water table; 4—surface water
Deer are introduced into a grassland ecosystem and their population increases considerably. If the deer population continues to grow, which is the most likely outcome for the ecosystem?
Biodiversity would decrease, and sustainability would increase.
Biodiversity would increase, and sustainability would increase.
Biodiversity would increase, and sustainability would decrease.
Biodiversity would decrease, and sustainability would decrease.
Which of these conditions is most responsible for Earth having an environment that supports life?
oceans regulating climate on land
the percentage of nitrogen in the atmosphere
water that exists in all three physical states of matter
erupting volcanoes moderating atmospheric temperatures
Which of these natural disasters are the most difficult to predict?
earthquakes
hurricanes
tornados
blizzards
Which of these is the best example of physical weathering?
ice fracturing a stone
insects eating a dead tree
a bulldozer pushing soil
acid rain dissolving limestone
As humans travel in space, which gas is provided in the atmosphere of the
spacecraft and which gas is removed from the atmosphere of the spacecraft?
Carbon dioxide is provided. Oxygen is removed.
Carbon dioxide is provided. Nitrogen is removed.
Oxygen is provided. Nitrogen is removed.
Oxygen is provided. Carbon dioxide is removed.
When frozen carbon dioxide is heated, it changes directly into a gas.
Which statement best indicates that a physical change has taken place?
Heat caused an increase in gas production.
Heat caused a new substance to form.
Heat caused a decrease in energy.
Heat caused a change in state.
After which event will primary succession most likely occur?
thunderstorm
crop harvest
volcanic eruption
urban development
Which properties are most important to sustaining life on Earth?
1 and 2
2 and 3
3 and 4
4 and 5
The outer layers of astronauts’ space suits are reflective in order to protect them from
the vacuum of space.
intense sunlight.
micrometeoroids.
water loss.
