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Primary 5 Science: Human System — Respiratory and Circulatory Systems / Gas Exchange Practice
Real Primary 5 Science questions on Human System — Respiratory and Circulatory Systems / Gas Exchange, 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)
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Real Human System — Respiratory and Circulatory Systems / Gas Exchange practice questions
During respiration, what do living things generally do with these two gases?
Take in oxygen and release carbon dioxide ✓
Take in carbon dioxide and release oxygen
Respiration breaks down glucose to release energy, using up oxygen and producing carbon dioxide as a waste gas.
Considering photosynthesis and respiration together, how are gases generally exchanged between plants and animals during daylight hours?
Both plants and animals take in carbon dioxide and release oxygen at all times
Plants only ever release gases, while animals only ever take in gases
Both plants and animals take in oxygen and release carbon dioxide at all times
Carbon dioxide is taken in and oxygen is released by plants during photosynthesis, while animals take in oxygen and release carbon dioxide during respiration ✓
During daylight, plants photosynthesising take in carbon dioxide and release oxygen, while animals respiring take in oxygen and release carbon dioxide - a mutually useful exchange of gases.
A runner breathes out heavily right after a hard sprint, much more than before she started running. Which gas is released in a much larger amount in her breath at that moment?
Carbon dioxide ✓
Oxygen
Hard exercise increases the rate of respiration in the body's cells, producing more carbon dioxide, which is then breathed out.
During respiration, which gas do living things take in?
Oxygen ✓
Carbon dioxide
Nitrogen
Hydrogen
Living things take in oxygen during respiration to help release energy from food.