BECE Science 4

Question 1

What is the main function of red blood cells?

Accepted Answer

Carry oxygen

Answer

Red blood cells contain hemoglobin, which binds to oxygen and transports it from the lungs to all tissues throughout the body.

Question 2

Which layer of the Earth is the thinnest?

Accepted Answer

Crust

Answer

The Earth's crust is its thinnest layer, ranging from about 5 km under the oceans to 70 km under continents.

Question 3

What happens to the speed of light as it moves from air into glass?

Accepted Answer

It decreases

Answer

Light slows down when passing from a less dense medium (air) to a more dense medium (glass), which also causes it to refract.

Question 4

Which gas is produced during aerobic respiration in living organisms?

Accepted Answer

Carbon dioxide

Answer

Aerobic respiration breaks down glucose using oxygen and releases carbon dioxide, water, and energy (ATP).

Question 5

What is the pH value of a neutral solution?

Accepted Answer

7

Answer

A neutral solution, such as pure water, has a pH of 7; values below 7 are acidic and values above 7 are basic (alkaline).

(BECE) Basic Education Certificate Examination Practice Test