Biology
What organelle is known as the "powerhouse" of the cell?
Mitochondria
What is a chemical reaction?
Answer: A process in which substances are transformed into new substances.
What is the SI unit of force?
Answer: Newton (N)
What is the name of the star at the centre of our Solar System?
Answer: The Sun
What process do plants use to make glucose using light energy?
Answer: Photosynthesis
What are the starting substances in a chemical reaction called?
Answer: Reactants
What is the formula for speed?
Answer: Speed = distance ÷ time
What force keeps planets in orbit around the Sun?
Answer: Gravity
Which molecule carries genetic information?
Answer: DNA
What gas is needed for aerobic respiration?
Answer: Oxygen
A car travels 120 km in 2 hours. What is its average speed?
Answer: 60 km/h
What is the name given to the path followed by a planet around a star?
Answer: Orbit
What is the relationship between genes and chromosomes?
Answer: Genes are sections of DNA found on chromosomes.
Why does increasing temperature usually increase the rate of a chemical reaction?
Answer: Particles move faster and collide more frequently and/or with more energy.
What is the difference between mass and weight?
Answer: Mass is the amount of matter; weight is the gravitational force acting on an object.
What causes day and night on Earth?
Answer: Earth's rotation on its axis
A plant is kept in darkness for several days. Predict what happens to its ability to produce glucose and explain why.
Answer: It cannot photosynthesize without light, so glucose production decreases/stops.
A reaction produces a gas and a temperature change. Give two pieces of evidence that a chemical reaction may have occurred.
Answer: Gas production and temperature change are two valid pieces of evidence.
A cyclist accelerates from 5 m/s to 15 m/s in 5 seconds. What is the acceleration?
Answer: 2 m/s²
Why does the Moon appear to change shape during the month?
Answer: We see different portions of the Moon's illuminated half as it orbits Earth.