Grade 7 Science Diagnostic Exam

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1 / 25

In a food chain, what is the role of a **producer**?

An organism that eats only plants.

An organism that breaks down dead organic matter.

An organism that makes its own food.

An organism that eats other animals.

2 / 25

What is the primary product of **photosynthesis** that provides energy for the plant?

Carbon dioxide

Water

Oxygen

Glucose

3 / 25

What is the main difference between a **plant cell** and an **animal cell**?

Plant cells are much smaller than animal cells.

Animal cells have a large central vacuole, while plant cells do not.

Plant cells have a cell wall and chloroplasts, which animal cells do not.

Animal cells have a nucleus, but plant cells do not.

4 / 25

What is the function of the **ribosome** in a cell?

To produce proteins.

To control all cell activities.

To store genetic information.

To produce energy for the cell.

5 / 25

Which of the following is the best example of a **chemical change**?

Tearing a piece of paper.

Dissolving salt in water.

Melting an ice cube into water.

Burning a piece of wood.

6 / 25

A student wants to measure the volume of an irregularly shaped rock. Which tool should they use?

A ruler

A thermometer

A graduated cylinder

A weighing scale

7 / 25

Which of the following is a characteristic of a **physical property** of matter?

It describes how a substance reacts with other substances.

It can only be observed by changing the substance's chemical identity.

It can be observed or measured without changing the substance's chemical composition.

It results in the formation of a new substance.

8 / 25

Which of the following is an example of **convection**?

The Sun's rays warming the Earth.

Touching a hot stove and feeling the heat.

The rising of hot air and the sinking of cooler air.

Heat traveling along a metal spoon placed in hot soup.

9 / 25

How is the speed of an object calculated?

Time divided by distance.

Mass multiplied by acceleration.

Distance divided by time.

Distance multiplied by time.

10 / 25

Which component of an atom carries a positive charge?

Proton

Electron

Neutron

Nucleus

11 / 25

What is the main function of the **nervous system** in the human body?

To transport oxygen and nutrients to cells.

To coordinate the body's actions and transmit signals between different parts.

To break down food and absorb nutrients.

To provide a framework and support for the body.

12 / 25

What is the main role of the **lungs** in the human body?

To digest food.

To filter blood.

To exchange oxygen and carbon dioxide.

To pump blood.

13 / 25

Which of the following describes the process of **meiosis**?

A process of cell division that results in two identical daughter cells.

The process by which a plant makes its own food.

A type of cell division that produces four genetically different daughter cells with half the number of chromosomes.

The process of a cell growing and developing before it divides.

14 / 25

What is the primary role of the **heart** in the human circulatory system?

To pump blood throughout the body.

To digest food and absorb nutrients.

To exchange oxygen and carbon dioxide with the air.

To filter waste products from the blood.

15 / 25

Which of the following is an example of an **abiotic factor** in an ecosystem?

A mushroom

A lion

A rock

A plant

16 / 25

Which of the following describes a characteristic of the **troposphere**?

It contains the ozone layer that protects Earth from ultraviolet radiation.

It is the layer where all weather phenomena occur.

It contains the ionosphere, which reflects radio waves.

It is the outermost layer of the atmosphere.

17 / 25

What is the process called when **water vapor turns into liquid water**?

Condensation

Transpiration

Evaporation

Precipitation

18 / 25

What is the difference between **weather** and **climate**?

Weather describes short-term atmospheric conditions, while climate describes long-term weather patterns.

Weather is affected by the Sun, but climate is not.

Climate is studied by meteorologists, while weather is studied by climatologists.

There is no difference; the terms are interchangeable.

19 / 25

The **rock cycle** describes the continuous process of how rocks change. What type of rock is formed from compacted layers of sand and silt?

Magma

Igneous rock

Sedimentary rock

Metamorphic rock

20 / 25

In a food web, what is the term for an organism that consumes both plants and animals?

Omnivore

Producer

Herbivore

Carnivore

21 / 25

The **Law of Conservation of Energy** states that:

Energy can be created and destroyed.

Energy cannot be created or destroyed, but can be converted from one form to another.

Energy can be destroyed but not created.

Energy can be created but not destroyed.

22 / 25

Why does the Sun appear so much larger and brighter than other stars?

It is the only star that produces its own light.

It reflects light from the other stars, making it appear brighter.

It is much closer to Earth than any other star.

It is a larger and hotter star than any other star in the universe.

23 / 25

Which layer of the Earth is a solid, metallic sphere at the center?

Crust

Mantle

Outer core

Inner core

24 / 25

Which state of matter has a **definite shape and definite volume**?

Liquid

Solid

Plasma

Gas

25 / 25

What is the function of the stomach in the digestive system?

To break down food using acid and enzymes

To pump blood

To chew food

To absorb water and minerals

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Grade 7 Science Diagnostic Exam

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