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7th Grade LEAP 2025 Science Review

Total questions: 52

Worksheet time: 1hrs 25mins

Name
Class
Date
1.

What organelle contains your genes?

a)

DNA

b)

Genomes

c)

Proteins

d)

Alleles

2.

Where does the food chain begin?

a)

Insects

b)

The sun

c)

Mice

d)

Birds of prey

3.

The process of which plants intake energy from the sun and convert it to glucose (sugar)

a)

Solar conversion

b)

Energy intake

c)

Photosynthesis

d)

I don't know

4.

What are the stages of cell division (mitosis)?

a)

Prephase, Metaphase, Intraphase, Aphase, Telophase

b)

Interphase, Prophase, Metaphase, Anaphase, Telophase, Cytokinesis

c)

Dualphase, Metaphase, Cellular Division, Cytokinesis, Prophase

d)

Before, during, and after

5.

What is the main control center of cells?

a)

Nucleolus

b)

Nucleus

c)

Golgi Body

d)

Lysosomes

6.

Both primary and secondary succession begin with pioneer species that

a)

use up all the existing resources and prevent establishment of non-native organisms

b)

modify the area and allow larger and more complex organisms to appear

c)

change the area and make it safer from predatory organisms

d)

invade the area so that new organisms cannot be established

7.

Frederick is studying how ecological succession will change a freshly-plowed piece of land. Which data table represents what Frederick is most likely to record about the plant life in each stage of ecological succession?

a)
b)
c)
d)
8.

The picture shows where oranges are grown in the United States. Oranges require a very long growing season with mild to hot weather.What is the most likely reason many of the oranges are grown in California?

a)

There are more organisms that eat oranges in California than in any other states.

b)

California has a climate that creates a good environment for growing oranges.

c)

Oranges will only grow in states on the coast with environments near water.

d)

Oranges will only grow in sandy soil that few of the other states have.

9.

When an ecosystem contains many different species, there are usually a high number of links in its food web. How does this affect the sustainability of the ecosystem?

a)

Typically, if one link in the food web is removed, the ecosystem will no longer exist.

b)

Typically, if one link in the food web is added, the ecosystem will destabilize.

c)

Typically, if one link in the food web is removed, the ecosystem will remain stable.

d)

Typically, if one link in the food web is added, the ecosystem will change its location.

10.

An ecosystem's sustainability is most dependent on?

a)

warm temperatures.

b)

the amount of water there.

c)

having a large number of a single plant species.

d)

the number and variety of organisms that live there.

11.

Which ecosystem would most likely survive if the grasses were destroyed by a plant virus?

a)

Ecosystem 2, because there are not many predators.

b)

Ecosystem 2, because the grasses could grow back quickly.

c)

Ecosystem 1, because there is a variety of producers that support the ecosystem

d)

Ecosystem 1, because there are fewer primary consumers.

12.

Which is a Physical change?

a)

Color

b)

Rusting

c)

Burning

d)

Reactions with acid

13.

An example of a decomposer is a(n)

a)

Fungi

b)

Fox

c)

Rabbit

d)

Grass

14.

What type of storm front is this?

a)

Warm Front

b)

Cold Front

c)

Stationary Front

d)

occluded front

15.

Which of these human activities will help to improve air quality?

a)

Planting Trees

b)

Burning Trash

c)

Installing Windmills

d)

Burning fossil fuels

16.

What Factors impact global temperatures over time?

a)

Distance from Sea

b)

latitude

c)

Closer to the sun

d)

warmer area

17.
Gas exchange in the body occurs in which system?
a)
respiratory
b)
nervous
c)
immune
d)
muscular
18.
What level of organization is this?
a)
cell
b)
tissue
c)
organ
d)
organ system
19.
a group of organ systems working together form __________________________
a)
an organ
b)
an organism
c)
an organ system
d)
a cell
20.

According to the Law of Conservation of Mass,

a)

matter is always created in a chemical reaction

b)

matter is always destroyed in a chemical reaction

c)

matter is created and then destroyed in a chemical reaction

d)

matter is not created or destroyed in a chemical reaction

21.

The diagram below shows a balance being used to measure a burning candle in a sealed glass ball before and after the burning is complete. As the candle burns, the size of the candle decreases, but the reading on the balance does not change. Which of the following is demonstrated by this experiment?

a)

The total mass of the system is constant.

b)

Energy is converted to mass when the candle is burned.

c)

Smoke particles have more mass than molecules of candle wax.

d)

Kinetic energy is converted to potential energy when the candle is burned.

22.

Examine the following chemical reaction: H20 + CO2 → C6H12O6 + O2 What are the reactants?

a)

H20 + CO2

b)

→

c)

C6H12O6 + O2

d)

H20 + CO2 → C6H12O6 + O2

23.

Examine the following chemical reaction: H20 + CO2 → C6H12O6 + O2 What are the products?

a)

H20 + CO2

b)

→

c)

C6H12O6 + O2

d)

H20 + CO2 → C6H12O6 + O2

24.

The law of conservation of mass can be demonstrated by a chemical reaction. Which of the following models of a chemical reaction best represents the law of conservation of mass?

a)
b)
c)
d)
25.

Substances created, or made, during a chemical reaction are known as the

a)

reactants

b)

products

c)

chemicals

d)

substances

26.
largest number of individuals of a population that the environment can support  
a)
carrying capacity
b)
primary succession 
c)
denitrification
d)
mutualism
27.
Non-living factor that affects an ecosystem
a)
biotic factor
b)
abiotic factor
c)
food chain 
d)
biome
28.
Living factors in an ecosystem
a)
abiotic factors
b)
species
c)
trophic level
d)
biotic factors
29.
All the living and non-living factors that interact in an area
a)
ecosystem
b)
carnivore
c)
niche
d)
population
30.
If a population grows larger than the carrying capacity of the environment, the population is likely to
a)
decrease
b)
 increase
c)
stay the same
31.

Looking at the graph of the pigeon population, which statement is TRUE?

a)

The maximum pigeon population was 275

b)

The largest decrease was between years 4 and 5

c)

The largest decrease was between years 7 and 8

d)

The population decreased from years 2 to 3

32.
What is an invasive species?
a)
A native (naturally found) species which are added to an area. 
b)
A non-native (not naturally found) species added to an area. 
c)
A keystone species in an environment
d)
none of the above
33.
Invasive species alter the ecosystem by a___________in number quickly,this leads to _____ food for the native  species. 
a)
increasing  less
b)
decline  decreasing
34.

What is Global Warming?

a)

Increasing temperature in Earth's atmosphere

b)

Decreasing temperature in a city

c)

Increasing rain rates in Earth

d)

Decreasing temperature rates

35.
Which of the following is NOT an effect of Global Warming?
a)
Polar ice caps will melt.
b)
Coastal regions will be covered with rising sea levels.
c)
Some areas will experience serious droughts
d)
The Earth's rotation will slow down and eventually stop
36.
The main human activity that releases greenhouse gases is
a)
using bottled water
b)
burning fossil fuels
c)
texting on cellphones
d)
eating meat
37.
How can global warming cause sea levels to rise? Choose the best answer.
a)
by causing it to rain more often
b)
by melting glaciers and ice caps
c)
by increasing the number of undersea volcanic eruptions
d)
by creating bigger and more powerful hurricanes
38.

The graph below shows CO2 emissions and temperatures from 1909 to 1949. What conclusion is best supported by the graph?

a)

There is no relationship between carbon dioxide concentrations and temperatures

b)

As carbon dioxide concentrations increase, temperatures increase

c)

As carbon dioxide concentrations increase, temperatures decrease

d)

As carbon dioxide concentrations decrease, temperatures increase

39.

Carbon Dioxide, CO2, comes from

a)

Burning fossil fuels

b)

Cold water

c)

Animal manure

d)

Plastic

40.
Humidity is the...
a)
Amount of Water Vapor in the Air
b)
Amount of Wind in the Air
c)
Amount of Precipitation in the Air
d)
Amount of Pressure in the Air
41.
What kind of weather is usually associated with a high pressure system?
a)
Sunny weather
b)
Precipitation (rain, snow, etc.)
42.
What kind of weather is usually associated with a low pressure system?
a)
Sunny weather
b)
Precipitation (rain, snow, etc.)
43.
In what direction do winds always blow?
a)
From areas of high pressure to areas of low pressure
b)
From areas of low pressure to areas of high pressure
44.
A warm air mass overtakes a slow-moving cold air mass is called a _____________________.
a)
warm front
b)
cold front
c)
stationary front
d)
occluded front
45.
Cold and warm masses meet, but neither can move the other is called a ______________________
a)
warm front
b)
cold front
c)
stationary front
d)
occluded front
46.
Which of the following air masses would be characterized as warm and dry?
a)
Maritime tropical
b)
Continental tropical
c)
Maritime polar
d)
Continental polar
47.
Which front has the symbol of blue triangles?
a)
warm front
b)
cold front
c)
stationary front
d)
occluded front
48.

In which state of matter are the molecules spaced farthest apart?

a)

Solid

b)

Liquid

c)

Gas

d)

All are equal

49.

Which statement correctly describes both gases and liquids?

a)

Their shapes stay the same in any container.

b)

Their shapes change when they are in different containers.

c)

Their volumes stay the same in any container.

d)

Their volumes change when they are in different containers.

50.

Brian's family has a compost pile at home. They put all the weeds they pull up from the garden in it as well as any vegetable waste they gather from the kitchen. If they keep it moist, all this vegetation will eventually turn into organic soil by the chemical process of decay. Since decay involves a variety of chemical reactions, how might temperature affect the rate at which the compost turns into soil?

a)

Temperatures near freezing would make it speed up.

b)

It would happen faster at warmer air temperatures.

c)

Changing temperatures would not affect the chemical reactions.

d)

Warm summer air temperatures would make it slow down.

51.
At higher temperatures
a)
particles in an object have less energy
b)
particles in an object move faster
c)
a gas contracts
52.

Which number has the particles moving the fastest?

a)

1

b)

2

c)

5

d)

4

e)

3

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