Which part of a plant usually absorbs water from the soil?
- Seeds
- Fruit
- Flowers
- Roots
Answer and explanation
Roots
Roots
Subjects
Science
Choose questions individually, practise online, or create a worksheet with matching answers. Counts include generated variants, not only authored originals.
Make a worksheet10,111 question instances
Topics
Sample exercises
Which animal is a mammal?
- Butterfly
- Dolphin
- Trout
- Frog
Answer and explanation
Dolphin
Dolphin
In a simple food chain, which organism is a producer?
- Rabbit
- Fox
- Hawk
- Grass
Answer and explanation
Grass
Grass
Which body organ pumps blood?
- Brain
- Lung
- Stomach
- Heart
Answer and explanation
Heart
Heart
What is the change from liquid water to water vapour called?
- Evaporation
- Condensation
- Freezing
- Melting
Answer and explanation
Evaporation
Evaporation
Which material is generally a good conductor of electricity?
- Rubber
- Copper
- Glass
- Dry wood
Answer and explanation
Copper
Copper
Study notes
Newton’s second law
Use the net force and consistent SI units for a constant-mass object.
Grades 8–11Acceleration
Velocities include direction; a negative result can represent decreasing positive velocity.
Grades 8–11Displacement at constant velocity
Displacement is signed; distance is the length of the path.
Grades 7–10Kinetic energy
Square speed before multiplying. This is the classical translational kinetic-energy model.
Grades 9–12Gravitational potential energy
Height is measured above the chosen reference level. Use the value of g stated in the question.
Grades 8–11Linear momentum
Momentum has direction; retain the sign of velocity in one dimension.
Grades 9–12Mechanical work
For a constant force parallel to displacement, cos θ = 1.
Grades 8–11Power
One watt is one joule per second.
Grades 8–11Ohm’s law
Applies to an ohmic component under constant physical conditions.
Grades 8–12Electrical power
For a steady DC circuit, multiply voltage by current.
Grades 9–12Resistors in series
The same current passes through ideal series components.
Grades 9–12Wave speed
Frequency is cycles per second; wavelength is the distance per cycle.
Grades 8–12Frequency and period
Period is the time for one complete cycle.
Grades 9–12Mass and amount of substance
Use compatible mass units: grams with grams per mole.
Grades 10–12Molar concentration
Use solution volume in litres when the answer is in mol/L.
Grades 10–12Atomic number and mass number
Atomic number counts protons; mass number counts protons plus neutrons.
Grades 8–11Half-life models
This idealized model halves the expected amount after each equal half-life interval.
Grades 10–12Pressure and force
Force is perpendicular to the surface; pascals are newtons per square metre.
Grades 8–12Thermal energy changes
Assume constant specific heat and no phase change.
Grades 9–12Spring force magnitudes
Assume the spring is within its linear elastic range; convert centimetres to metres.
Grades 9–12Energy efficiency
Useful output cannot exceed total input in this simple energy accounting model.
Grades 7–11Two parallel resistors
The equivalent resistance is less than either positive branch resistance.
Grades 10–12Charge transferred
This relation uses constant current in amperes and time in seconds.
Grades 8–12Solution dilution
Solute amount is conserved; V₂ is final solution volume, not added solvent volume.
Grades 10–12Gas volume and temperature
Assume an ideal gas with constant pressure and amount; temperatures must be in kelvins.
Grades 10–12Model isotope averages
The given masses and abundances describe a hypothetical element; fractions sum to one.
Grades 9–12Motion & energy · Formula sheet
Rules, conditions and small examples in one printable reference.
Grades 7–8Motion & energy · Formula sheet
Rules, conditions and small examples in one printable reference.
Grades 9–10Motion & energy · Formula sheet
Rules, conditions and small examples in one printable reference.
Grades 11–12Electricity & circuits · Formula sheet
Rules, conditions and small examples in one printable reference.
Grades 8–8Electricity & circuits · Formula sheet
Rules, conditions and small examples in one printable reference.
Grades 9–10Electricity & circuits · Formula sheet
Rules, conditions and small examples in one printable reference.
Grades 11–12Waves & sound · Formula sheet
Rules, conditions and small examples in one printable reference.
Grades 8–8Waves & sound · Formula sheet
Rules, conditions and small examples in one printable reference.
Grades 9–10Waves & sound · Formula sheet
Rules, conditions and small examples in one printable reference.
Grades 11–12Chemistry · Formula sheet
Rules, conditions and small examples in one printable reference.
Grades 8–8Chemistry · Formula sheet
Rules, conditions and small examples in one printable reference.
Grades 9–10Chemistry · Formula sheet
Rules, conditions and small examples in one printable reference.
Grades 11–12Living things and their needs
20 key concepts, retrieval questions and a learning checkpoint.
Grades 1–4Living things and their needs · quick reference
Classify using observable features, not just where an animal lives. A whale is a mammal even though it lives in water.
Grades 1–4Cells and cell structures
20 key concepts, retrieval questions and a learning checkpoint.
Grades 6–10Cells and cell structures · quick reference
Do not assume every cell has every organelle. Bacterial cells have ribosomes but no membrane-bound nucleus.
Grades 6–10Ecosystems and interactions
20 key concepts, retrieval questions and a learning checkpoint.
Grades 5–10Ecosystems and interactions · quick reference
Food-web arrows show the direction of energy transfer: from the food organism to the organism eating it.
Grades 5–10Genetics and inheritance
20 key concepts, retrieval questions and a learning checkpoint.
Grades 9–12Genetics and inheritance · quick reference
Dominant does not mean more common, stronger or better. A simple genetic model may not describe a complex human trait.
Grades 9–12Matter and changes
20 key concepts, retrieval questions and a learning checkpoint.
Grades 3–7Matter and changes · quick reference
A change of state is physical. Heating does not automatically mean a new substance has formed.
Grades 3–7Atomic structure and chemical language
25 key concepts, retrieval questions and a learning checkpoint.
Grades 8–12Atomic structure and chemical language · quick reference
Distinguish mass number from average atomic mass. Symbols and subscripts identify atoms; coefficients count whole formula units.
Grades 8–12Earth systems
20 key concepts, retrieval questions and a learning checkpoint.
Grades 4–9Earth systems · quick reference
Weathering breaks material down; erosion transports it. These processes can happen together, but they are not the same.
Grades 4–9Space and the solar system
20 key concepts, retrieval questions and a learning checkpoint.
Grades 3–8Space and the solar system · quick reference
A light-year measures distance, not time. Not every full Moon produces an eclipse because the orbital planes are tilted.
Grades 3–8Motion, forces and energy
20 key concepts, retrieval questions and a learning checkpoint.
Grades 7–11Motion, forces and energy · quick reference
Zero net force means zero acceleration, not necessarily zero velocity. An object can move steadily in equilibrium.
Grades 7–11Waves and electric circuits
20 key concepts, retrieval questions and a learning checkpoint.
Grades 7–12Waves and electric circuits · quick reference
Voltage is measured across a component; current is measured through a path. Never practise these concepts on household mains wiring.
Grades 7–12Materials and everyday changes
Describe hardness, flexibility, transparency and absorbency, rather than simply saying a material is good.
Grades 1–3Materials and everyday changes · revision card
Describe hardness, flexibility, transparency and absorbency, rather than simply saying a material is good.
Grades 1–3Growing plants: questions and evidence
Change the factor being tested and keep other relevant conditions as similar as possible.
Grades 3–5Growing plants: questions and evidence · revision card
Change the factor being tested and keep other relevant conditions as similar as possible.
Grades 3–5Food webs and ecosystem reasoning
In these exercises an arrow points from a food source to the organism that eats it.
Grades 5–8Food webs and ecosystem reasoning · revision card
In these exercises an arrow points from a food source to the organism that eats it.
Grades 5–8Particle models of matter
A particle model explains observations; it is not a literal photograph of individual particles.
Grades 6–9Particle models of matter · revision card
A particle model explains observations; it is not a literal photograph of individual particles.
Grades 6–9Chemical equations: atom bookkeeping
Change coefficients in front of formulas, not the subscripts that identify a substance.
Grades 8–11Chemical equations: atom bookkeeping · revision card
Change coefficients in front of formulas, not the subscripts that identify a substance.
Grades 8–11Concentration and dilution: avoid common errors
Molar concentration uses the total final solution volume in litres.
Grades 10–12Concentration and dilution: avoid common errors · revision card
Molar concentration uses the total final solution volume in litres.
Grades 10–12Genetics: models and probability
These questions assume one gene with alleles A and a, complete dominance, and equally likely allele transmission.
Grades 8–11Genetics: models and probability · revision card
These questions assume one gene with alleles A and a, complete dominance, and equally likely allele transmission.
Grades 8–11Enzymes and interpreting rate data
Enzymes increase reaction rate by providing a pathway with a lower activation-energy barrier.
Grades 10–12Enzymes and interpreting rate data · revision card
Enzymes increase reaction rate by providing a pathway with a lower activation-energy barrier.
Grades 10–12Designing tests and judging conclusions
Ask what was measured, how often, and which alternative explanations remain.
Grades 6–10Designing tests and judging conclusions · revision card
Ask what was measured, how often, and which alternative explanations remain.
Grades 6–10Motion graphs and force reasoning
Speed is the magnitude of velocity. Acceleration is a change in velocity per unit time.
Grades 8–11Motion graphs and force reasoning · revision card
Speed is the magnitude of velocity. Acceleration is a change in velocity per unit time.
Grades 8–11Circuits: series and parallel reasoning
The simple questions assume ideal wires and components with the stated resistance.
Grades 8–12Circuits: series and parallel reasoning · revision card
The simple questions assume ideal wires and components with the stated resistance.
Grades 8–12Measurement, units and observations
Use a unit appropriate to the quantity and size being measured.
Grades 3–7Measurement, units and observations · revision card
Use a unit appropriate to the quantity and size being measured.
Grades 3–7Pushes, pulls and simple machines
A force can change motion or shape, depending on other forces and constraints.
Grades 2–5Pushes, pulls and simple machines · revision card
A force can change motion or shape, depending on other forces and constraints.
Grades 2–5Weather records and environmental data
Weather describes shorter-term conditions; climate concerns longer-term patterns and distributions.
Grades 4–8Weather records and environmental data · revision card
Weather describes shorter-term conditions; climate concerns longer-term patterns and distributions.
Grades 4–8Observing, recording and comparing
Separate an observation from a guess about its cause.
Grades 1–4Observing, recording and comparing · Revision card
Separate an observation from a guess about its cause.
Grades 1–4Habitats, resources and adaptation
Explain how a feature can help in a particular environment.
Grades 2–5Habitats, resources and adaptation · Revision card
Explain how a feature can help in a particular environment.
Grades 2–5Water pathways: storage and movement
Water can move among air, land, surface water and underground storage.
Grades 4–8Water pathways: storage and movement · Revision card
Water can move among air, land, surface water and underground storage.
Grades 4–8Earth, the Moon and changing viewpoints
Rotation is spinning about an axis; an orbit is a path around another body.
Grades 4–8Earth, the Moon and changing viewpoints · Revision card
Rotation is spinning about an axis; an orbit is a path around another body.
Grades 4–8Mixtures and choosing a separation method
Particle size, magnetism, solubility and boiling behaviour can help separate mixtures.
Grades 5–8Mixtures and choosing a separation method · Revision card
Particle size, magnetism, solubility and boiling behaviour can help separate mixtures.
Grades 5–8Atoms, ions and particle bookkeeping
Atomic number is the proton count.
Grades 8–11Atoms, ions and particle bookkeeping · Revision card
Atomic number is the proton count.
Grades 8–11Genetics: model crosses and their limits
These questions use one gene with two alleles, A and a, and complete dominance where stated.
Grades 8–12Genetics: model crosses and their limits · Revision card
These questions use one gene with two alleles, A and a, and complete dominance where stated.
Grades 8–12Energy transfers and useful output
Identify where energy enters, is stored and is transferred out.
Grades 6–10Energy transfers and useful output · Revision card
Identify where energy enters, is stored and is transferred out.
Grades 6–10Investigations, controls and cautious conclusions
Identify the factor changed, the outcome measured and important controlled factors.
Grades 9–12Investigations, controls and cautious conclusions · Revision card
Identify the factor changed, the outcome measured and important controlled factors.
Grades 9–12Investigation planning and evidence checklist
A compact reference for designing, recording and evaluating a classroom investigation.
Grades 6–12Ask, observe and compare
Build a fair comparison from a clear question.
Grades 3–6Ask, observe and compare · Revision sheet
Build a fair comparison from a clear question.
Grades 3–6Materials and useful properties
Choose a property that matters for a design task.
Grades 2–5Materials and useful properties · Revision sheet
Choose a property that matters for a design task.
Grades 2–5Measurements, uncertainty and fair comparisons
A measurement combines a numerical estimate with units and an appropriate description of uncertainty. More digits do not necessarily mean better evidence.
Grades 7–12Measurements, uncertainty and fair comparisons · revision notes
A measurement combines a numerical estimate with units and an appropriate description of uncertainty. More digits do not necessarily mean better evidence.
Grades 7–12