PSLE Science Biology Topics 3 — Questions and Answers
Question 1: What is the function of the lungs?
- To pump blood
- To digest food
- To exchange gases (Correct answer)
- To filter waste
Correct answer: To exchange gases
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?
- Vitamins
- Proteins
- Carbohydrates (Correct answer)
- Minerals
Correct answer: Carbohydrates
Carbohydrates (found in rice, bread, and pasta) are the body's main source of energy.
Question 3: What is a food chain?
- A chain made of food
- A sequence showing how energy passes from one organism to another (Correct answer)
- A list of healthy foods
- A recipe for cooking
Correct answer: A sequence showing how energy passes from one organism to another
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?
- Incisors
- Canines (Correct answer)
- Premolars
- Molars
Correct answer: Canines
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?
- To produce food using sunlight
- To hunt and eat other animals
- To break down dead organisms and recycle nutrients (Correct answer)
- To provide shelter for animals
Correct answer: To break down dead organisms and recycle nutrients
Decomposers (like fungi and bacteria) break down dead plants and animals, returning nutrients to the soil.
Question 6: Which organ in the human body is responsible for filtering blood and producing urine?
- Heart
- Liver
- Kidney (Correct answer)
- Stomach
Correct answer: Kidney
The kidneys filter blood to remove waste products and excess water, producing urine.
PSLE Science Biology Topics 3
What is the function of the lungs?