Worksheets8th Grade Science Quiz Review
Total questions: 20
Worksheet time: 10mins
What is the chemical symbol for water?
H
O
H 2 O
CO 2
Which of the following best describes the process of photosynthesis?
Plants converting sunlight into chemical energy
Animals breathing in oxygen
Water evaporating from leaves
Soil absorbing nutrients
Explain why the Earth experiences different seasons.
The Earth is closer to the Sun in summer.
The Earth's axis is tilted as it orbits the Sun.
The Sun's energy output changes throughout the year.
The Earth's rotation speed changes.
What is the primary function of the roots of a plant?
To produce flowers
To absorb water and nutrients
To perform photosynthesis
To attract pollinators
Which of the following is an example of a physical change?
Burning wood
Rusting iron
Melting ice
Baking a cake
Describe the role of mitochondria in a cell.
They store genetic information.
They produce energy through cellular respiration.
They synthesize proteins.
They control cell division.
What is the formula for calculating speed?
Speed = Distance × Time
Speed = Distance ÷ Time
Speed = Time ÷ Distance
Speed = Distance + Time
Which of the following best explains why metals are good conductors of electricity?
They have free electrons that move easily.
They have tightly bound electrons.
They are dense materials.
They have high melting points.
Analyze the impact of deforestation on the carbon cycle.
It increases oxygen production.
It decreases carbon dioxide levels.
It disrupts the balance by increasing carbon dioxide levels.
It has no effect on the carbon cycle.
What is the main gas found in the Earth's atmosphere?
Oxygen
Carbon Dioxide
Nitrogen
Hydrogen
Which of the following is a renewable energy source?
Coal
Natural Gas
Solar Power
Nuclear Power
Evaluate the effects of acid rain on aquatic ecosystems.
It neutralizes the water pH.
It increases biodiversity.
It lowers the pH, harming aquatic life.
It has no significant impact.
What is the basic unit of life?
Atom
Molecule
Cell
Organ
Which of the following processes is responsible for the formation of clouds?
Condensation
Evaporation
Precipitation
Sublimation
Predict the outcome of increasing greenhouse gases in the atmosphere.
Decrease in global temperatures
Increase in global temperatures
Stabilization of global temperatures
No change in global temperatures
What is the primary source of energy for the Earth's climate system?
The Moon
The Sun
The Earth's core
Ocean currents
Which of the following is a chemical property of matter?
Color
Density
Flammability
Mass
Assess the role of decomposers in an ecosystem.
They produce energy for plants.
They recycle nutrients back into the soil.
They compete with herbivores for food.
They provide shelter for animals.
What is the pH level of a neutral solution?
0
7
14
10
Which of the following best describes the function of chlorophyll in plants?
It absorbs sunlight for photosynthesis.
It stores water for the plant.
It transports nutrients throughout the plant.
It protects the plant from herbivores.
