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Primary 6 Science: Human Biology Enrichment Practice
Real Primary 6 Science questions on Human Biology Enrichment, pulled directly from the Olibits question bank — the same questions a child would actually see, not separately written for this page.
MOE strand: Discovery Science
Curriculum alignment
Science Teaching & Learning Syllabus, Primary Three to Six (MOE, 2023 syllabus)
Science is not a taught subject at P1/P2 under MOE's own syllabus — our P1/P2 Science content is offered as enrichment beyond the official syllabus, not as a claim of syllabus coverage at those grades.
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Real Human Biology Enrichment practice questions
What is the main function of red blood cells?
To digest nutrients before they enter the bloodstream
To carry oxygen from the lungs to body cells ✓
To break down harmful bacteria that enter the body
To produce carbon dioxide for the lungs to remove
Red blood cells contain a substance called haemoglobin, which binds to oxygen in the lungs and releases it to body cells that need it for respiration.
Besides transporting blood cells, what does blood plasma mainly carry around the body?
Digested nutrients, carbon dioxide and other dissolved waste products ✓
Only air that has just been breathed in
Only oxygen that has not yet reached the lungs
Only undigested solid food particles
Plasma is the liquid part of blood, and it carries dissolved substances such as digested nutrients, carbon dioxide and waste products between the digestive, respiratory and excretory systems.
Which type of blood vessel carries blood away from the heart?
Capillaries
Alveoli
Arteries ✓
Veins
Arteries are thick-walled blood vessels that carry blood, usually rich in oxygen, away from the heart to the rest of the body.
Which type of blood vessel carries blood back towards the heart?
Bronchioles
Capillaries
Arteries
Veins ✓
Veins carry blood, usually low in oxygen, from the body back towards the heart, and often contain valves to prevent blood from flowing backwards.