OAA Science

Question 1

What is the primary source of energy for the Earth?

Accepted Answer

The Sun

Answer

The Sun is the ultimate source of almost all energy on Earth. Its radiant energy drives photosynthesis, powers the water cycle, and creates weather patterns, making it fundamental for sustaining life and geological processes.

Question 2

What is the process by which plants make their own food?

Accepted Answer

Photosynthesis

Answer

Photosynthesis is the vital process by which green plants, algae, and some bacteria convert light energy into chemical energy. They use sunlight, water, and carbon dioxide to create glucose (food) and release oxygen as a byproduct.

Question 3

What is the chemical formula for water?

Accepted Answer

H₂O

Answer

H₂O is the universally recognized chemical formula for water. This formula indicates that each molecule of water is composed of two hydrogen atoms bonded to one oxygen atom, a fundamental compound for all known life.

Question 4

What is the force that pulls objects toward the center of the Earth?

Accepted Answer

Gravity

Answer

Gravity is the fundamental force of attraction that pulls objects with mass towards each other. On Earth, it is responsible for objects falling downwards and for keeping us grounded, constantly pulling everything towards the planet's center.

Question 5

What is the basic unit of life?

Accepted Answer

Cell

Answer

The cell is considered the basic unit of life because it is the smallest structural and functional unit of an organism that can perform all processes necessary for life. All living things, from bacteria to humans, are composed of one or more cells.

(OAA) Ohio Achievement Assessment Practice Test

(OAA) Ohio Achievement Assessment Practice Test

OAA Science