STEM Science Content Knowledge 2

Question 1

Which type of chemical bond involves the sharing of electron pairs between atoms?

Accepted Answer

Covalent bond

Answer

Covalent bonds form when two atoms share electron pairs, unlike ionic bonds where electrons are fully transferred.

Question 2

What is the primary function of mitochondria in eukaryotic cells?

Accepted Answer

ATP production via cellular respiration

Answer

Mitochondria are the powerhouses of the cell, generating ATP through oxidative phosphorylation during cellular respiration.

Question 3

According to Newton's Second Law of Motion, if the net force on an object doubles while mass remains constant, what happens to acceleration?

Accepted Answer

It doubles

Answer

Newton's Second Law states F = ma, so if F doubles and m is constant, acceleration a must also double.

Question 4

Which layer of Earth's atmosphere contains the ozone layer?

Accepted Answer

Stratosphere

Answer

The ozone layer is located within the stratosphere, approximately 15–35 km above Earth's surface.

Question 5

What is the name of the process by which plants convert light energy into chemical energy?

Accepted Answer

Photosynthesis

Answer

Photosynthesis is the process by which plants use sunlight, water, and CO₂ to produce glucose and oxygen.

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