☰ Year plan · Science

Senses, echoes and the brain

Week 4 · Axis 1, Unit 1 Living Systems, Concept 1.2 How Do Senses Work? (A) · 3 lessons
1

The five senses

Discovery Education Science P4: Term 1, Unit 1, pp. 34–46
GoalName the five senses and the sense organs, and say how each one helps us stay safe.
New words
senses · the ways our body finds out about the world: sight, hearing, smell, taste and touchsense organ · a body part that collects information, such as the eye or the earinformation · facts about what is happening around us
Explanation

Your senses tell you what is happening around you. You have five: sight, hearing, smell, taste and touch. Each sense uses its own sense organ to collect information. The eyes see light, the ears hear sounds, the nose smells, the tongue tastes and the skin feels touch, heat and cold. The senses also keep us safe. We see a car coming and wait on the pavement. We hear a horn and step back. We smell smoke and tell a grown-up. We feel that a teapot is hot and take our hand away. Each sense gives different information, and together they give a full picture of the world. Never taste or smell an unknown thing to find out what it is.

SenseSense organIt finds out…
sighteyesshapes, colours, movement
hearingearssounds
smellnosesmells in the air
tastetonguesweet, sour, salty, bitter
touchskinhot, cold, rough, smooth
Worked examples
earsstop
Nour hears a loud horn while she waits to cross the road. She stops. Her ears gave her the information and she stayed safe.
skinrough
Seif holds a smooth stone in one hand and a rough brick in the other. His skin feels the difference even with his eyes closed.
breadnose
A baker takes fresh bread from the oven. Malak smells it from the street. Her nose gives her information that nobody told her.
Class activity

Mystery bag. A grown-up puts four safe, clean objects in a cloth bag: a sponge, a key, a wooden spoon, a cotton ball. Without looking, put one hand in and feel one object. Say what you feel (hard, soft, smooth, rough, cold) and guess the object. Then take it out and check. Which sense did you use? Repeat with a friend. Nothing goes in the mouth.

Practice
1
Which sense organ do we use to hear?
2
Match each sense organ to its sense. Say the pairs.
123
3
Give an example of how smell can keep us safe.
4
Why must you never use your tongue or nose to test something you do not know?