PSLE Science Biology Topics 3

Question 1

What is the function of the lungs?

Accepted Answer

To exchange gases

Answer

The lungs are responsible for gas exchange — taking in oxygen from the air and releasing carbon dioxide from the blood.

Question 2

Which food group provides the most energy?

Accepted Answer

Carbohydrates

Answer

Carbohydrates (found in rice, bread, and pasta) are the body's main source of energy.

Question 3

What is a food chain?

Accepted Answer

A sequence showing how energy passes from one organism to another

Answer

A food chain shows the flow of energy from producers (plants) to consumers (animals) in a linear sequence.

Question 4

Which type of teeth are used for tearing food?

Accepted Answer

Canines

Answer

Canines are the pointed teeth used for tearing food. They are especially prominent in carnivores.

Question 5

What is the role of decomposers in an ecosystem?

Accepted Answer

To break down dead organisms and recycle nutrients

Answer

Decomposers (like fungi and bacteria) break down dead plants and animals, returning nutrients to the soil.

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