Olibits / Science / Human System — Respiratory and Circulatory Systems
Primary 5 Science: Human System — Respiratory and Circulatory Systems Practice
Real Primary 5 Science questions on Human System — Respiratory and Circulatory Systems, pulled directly from the Olibits question bank — the same questions a child would actually see, not separately written for this page.
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.
Olibits is an independent learning platform and is not affiliated with or endorsed by the Ministry of Education. See our FAQ for the full breakdown.
Real Human System — Respiratory and Circulatory Systems practice questions
Which organ lies between the mouth and the stomach, connecting them together?
The small intestine
The large intestine
The oesophagus ✓
The anus
The oesophagus is the tube that connects the mouth to the stomach, allowing swallowed food to travel down.
Which organ contains teeth and produces saliva to begin digestion?
The stomach
The small intestine
The mouth ✓
The large intestine
The mouth contains teeth for chewing and produces saliva, making it the organ where digestion begins.
Why are digestive juices (acids and enzymes) important in the stomach and small intestine?
They allow the body to store food forever
They chemically break down food into smaller substances the body can absorb ✓
They pump blood to the digestive organs
They help teeth grow back
Digestive juices contain acids and enzymes that chemically break food down into smaller substances so nutrients can be absorbed.
Which of these is NOT part of the human digestive system?
Mouth
Small intestine
Heart ✓
Large intestine
The heart pumps blood around the body and is part of the circulatory system, not the digestive system.