Standard Science Primary 5 Systems

What is the main function of blood in the human transport system?

A To digest food into simpler substances.
B To pump air into the lungs.
C To absorb water from undigested food.
D To transport oxygen, digested food, and waste materials.
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Worked Solution

Step 1: Identify the role of the circulatory (transport) system. Step 2: Blood acts as the transport medium in the body. Step 3: It carries oxygen from lungs and digested food from intestines to all cells, and carries waste (like carbon dioxide) away from cells.

Correct answer: To transport oxygen, digested food, and waste materials.

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