Science - Roots School System

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Activity Sheet # 3, Aug – Sep 1. Which muscles do you use when you smile? …………………………………………………………………………………………………….. 2. Which muscles allow you to turn your head? …………………………………………………………………………………………………….. 3. Name two actions you can do with your leg muscle. (a) ……………………………………………………………………………………………… (b) ……………………………………………………………………………………………… 4. Name two actions you can do with your arm and hand muscles (a) ……………………………………………………………………………………………… (b) ……………………………………………………………………………………………… 5. When you breathe in and out, which muscles are you using? ……………………………………………………………………………………………………..
ROOTS SCHOOL SYSTEM Head Office: 74 Harley Street, Rawalpindi Cantt. Name : ……………………… Subject : <strong>Science</strong> Date : ……………………… Month : Oct Class : IV Sec : ……… ACTIVITY SHEET # 1 The Ear HOW YOU HEAR: Clap your hands. You hear the sound of the clap with your ears. The sound moves very fast. Each part of your ear helps you to hear the sound of the clap. The outer ear gathers the sound and moves it into the ear canal. Then the sound hits the eardrum. The eardrum moves very fast. It vibrates. This makes the small bones in the middle ear vibrate. The oval window also moves very fast. This vibration is transferred to the hair cells in the cochlea. Then something very special happens. The hair cells change the clapping sound to a kind of electricity. The electricity moves up the auditory nerve to your brain. You hear the clapping sound when the electricity gets to your brain. Look at the picture. It shows what happens to the clapping sound. It happens very fast. Fill in the blanks with suitable words given below: 1. The ear has ………………………… parts. 2. The outer ear stops at the ………………………… 3. The middle ear has ………………………… small bones. 4. They are called the …………………………, the …………………………, and the ………………………… WORD BANK 3, stirrup, hammer, cochlea, liquid, vibrate, anvil, eardrum, 3 5. The small bones in the middle ear move very fast. They …………………………
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Science - Roots School System

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