Human Sensory Organs
Primary 4 · Science and Elementary Technology
Human Sensory Organs
Lesson 5 of 5
15 min
Let's begin
Ishimwe sits at the back of the class. She squints at the board, but the words look blurry. Her teacher moves her to the front and tells her parents to take her for an eye test at the health centre.
Our eyes are precious. Let's find out how they work and how to look after them.
Try this with a friend: look at your friend's pupils in dim light, then near a bright window. In bright light the pupils get smaller, to let in less light. In dim light they get bigger.
Tip
Clean hands, good light, never stare at the sun, and eat your carrots and dodo!
Try each one first, then tap Show answer to check.
What is the black hole in the middle of the eye called?
Answer: The pupil.
Which part carries messages from the eye to the brain?
Answer: The optic nerve.
What happens to your pupils in bright light?
Answer: They get smaller, to let in less light.
Name two foods that help your eyes stay healthy.
Answer: Any two of: carrots, orange sweet potatoes, dark green leaves, mangoes, pawpaw, eggs, milk.
What do tears do?
Answer: They keep the eye wet and wash away dust and some germs.
What you learned today
Sources and credits
The exercises (Try it yourself and the practice questions) are written by Ganzaa.
This lesson adapts CC BY-SA material and is shared under CC BY-SA 4.0.
Quick check
Match each part of the eye to its job.
Tap one on the left, then its partner on the right.
