Primary 4 Revision Checklist
Created by Miss Clarissa Ng · www.clartutors.com
Primary 4 Science — all five topics
Tick each line once you can explain it
Matter
Anything with mass and volume — marbles, water and air all count
Light, music and shadows are not matter: no mass, no space taken up
Three states: solid, liquid and gas
Gases can be compressed; solids and liquids cannot
Human Body Systems
A system is parts that work together to do one job
Digestion breaks food into simpler substances that the blood absorbs
Mouth, gullet, stomach, then the small and large intestines
The respiratory, circulatory and skeletal systems work together with digestion
Plant System
Leaves trap light to make food; broad and flat gives more surface to trap more
Stems hold the plant up and hold the leaves where the light is
Roots anchor the plant and take in water and mineral salts
A plant needs every part — each does one thing the others cannot
Light & Shadows
Light travels in straight lines; it does not bend around objects
A shadow needs a light source, an object to block the light and a screen
Nearer the light source → bigger shadow; nearer the screen → smaller
Shadows are long in the morning and evening, shortest at noon
Heat
Heat flows from hot to cold until both are the same temperature
Metals conduct heat quickly; air, wood, plastic and rubber slowly
Gain heat → expand; lose heat → contract
The Sun is the main source of heat; fuels and electricity give out heat too