KS2 SATs Science Sampling 2 — Questions and Answers
Question 1: What is the function of the heart in the human body?
- To digest food
- To pump blood around the body (Correct answer)
- To filter waste from the blood
- To produce oxygen
Correct answer: To pump blood around the body
The heart is a muscular organ that pumps blood around the body through the circulatory system, delivering oxygen and nutrients to cells and removing waste products.
Question 2: Which of these changes is reversible?
- Burning wood
- Cooking an egg
- Melting chocolate (Correct answer)
- Baking a cake
Correct answer: Melting chocolate
Melting chocolate is reversible — you can melt it and then cool it to make it solid again. Burning, cooking, and baking cause chemical changes that cannot be undone.
Question 3: What do producers in a food chain typically get their energy from?
- Other animals
- The soil
- The Sun (Correct answer)
- Water
Correct answer: The Sun
Producers (mainly green plants) get their energy from the Sun through photosynthesis. They convert light energy into chemical energy in their food.
Question 4: Sound travels fastest through which type of material?
- Air
- Water
- Solid metal (Correct answer)
- A vacuum
Correct answer: Solid metal
Sound travels fastest through solids because the particles are closest together, allowing vibrations to pass quickly from one particle to the next. Sound cannot travel through a vacuum at all.
Question 5: What process do plants use to make their own food?
- Respiration
- Photosynthesis (Correct answer)
- Pollination
- Germination
Correct answer: Photosynthesis
Photosynthesis is the process by which green plants use sunlight, water and carbon dioxide to make glucose (food) and oxygen.
Question 6: Which of these is an example of a physical change?
- Rusting of iron
- Dissolving sugar in water (Correct answer)
- Burning paper
- Cooking meat
Correct answer: Dissolving sugar in water
Dissolving sugar in water is a physical change — the sugar can be recovered by evaporating the water. No new substance is formed. Rusting, burning, and cooking are chemical changes.
KS2 SATs Science Sampling 2
What is the function of the heart in the human body?