Correct answer: B. Carbohydrates

Solution: Carbohydrates are commonly broken down to provide glucose for cellular respiration.

Shortcut idea: Energy first: carbohydrates.

Important note: A balanced diet includes all essential nutrients, water and fibre.

Correct answer: B. Proteins

Solution: Proteins supply amino acids used to build and repair tissues.

Shortcut idea: Repair = protein.

Important note: Pulses, eggs, milk and soy are useful protein sources.

Correct answer: A. Vitamin A

Solution: Vitamin A is essential for normal vision, especially in dim light.

Shortcut idea: A = eyesight.

Important note: Vitamin D deficiency can cause rickets in children.

Correct answer: B. Goitre

Solution: Iodine is needed to make thyroid hormones; deficiency may enlarge the thyroid gland.

Shortcut idea: Iodine → thyroid → goitre.

Important note: Use adequately iodised salt.

Correct answer: B. Spinach and pulses

Solution: Green leafy vegetables and pulses can contribute iron to the diet.

Shortcut idea: Iron helps make haemoglobin.

Important note: Vitamin C with plant foods can improve non-haem iron absorption.

Correct answer: B. Mouth

Solution: Salivary amylase begins breaking down starch in the mouth.

Shortcut idea: Starch starts in the mouth.

Important note: Most nutrient absorption occurs in the small intestine.

Correct answer: B. Liver

Solution: The liver produces bile; the gall bladder stores and concentrates it.

Shortcut idea: Liver makes, gall bladder stores.

Important note: Bile emulsifies fats; it is not a digestive enzyme.

Correct answer: B. Increase absorption surface

Solution: Villi and microvilli greatly increase the surface area for nutrient absorption.

Shortcut idea: Villi = more surface.

Important note: Absorbed nutrients enter blood or lymph.

Correct answer: B. Starch

Solution: Iodine forms a blue-black complex with starch.

Shortcut idea: Iodine + starch = blue-black.

Important note: Biuret reagent is commonly used to test for protein.

Correct answer: A. Greasy translucent paper spot

Solution: Fats leave a persistent translucent spot on paper.

Shortcut idea: Oil leaves a translucent mark.

Important note: Food tests indicate presence, not the exact amount of nutrient.

Correct answer: C. Cotton

Solution: Cotton fibres come from the cotton plant.

Shortcut idea: Cotton = plant; wool = animal.

Important note: Rayon is regenerated cellulose; nylon is synthetic.

Correct answer: A. Sheep fleece

Solution: Wool is commonly obtained by shearing sheep fleece.

Shortcut idea: Wool → sheep.

Important note: Silk fibre is produced by silkworm larvae.

Correct answer: C. Copper

Solution: Copper contains mobile electrons and is widely used in electrical wiring.

Shortcut idea: Metals usually conduct.

Important note: Graphite is a non-metal that also conducts electricity.

Correct answer: B. Ductility

Solution: Ductility is the ability to be drawn into wires.

Shortcut idea: Ductile = wire; malleable = sheets.

Important note: Metals are often lustrous, malleable and ductile.

Correct answer: A. Iron

Solution: Iron is ferromagnetic and is strongly attracted to a magnet.

Shortcut idea: Remember iron, nickel, cobalt.

Important note: Not all metals are magnetic.

Correct answer: B. Filtration

Solution: Filter paper retains sand while water passes through.

Shortcut idea: Insoluble solid + liquid → filtration.

Important note: Decantation can separate settled solids from liquid.

Correct answer: B. Evaporation

Solution: Evaporating water leaves dissolved salt behind.

Shortcut idea: Dissolved solid → evaporate solvent.

Important note: Crystallisation can obtain purer crystals.

Correct answer: A. Centrifugation

Solution: Centrifugation separates components of different densities by spinning.

Shortcut idea: Spin fast = centrifuge.

Important note: The method selected depends on component properties.

Correct answer: B. Physical change

Solution: Only the state changes; water remains H₂O.

Shortcut idea: Same substance = physical change.

Important note: Many physical changes are reversible.

Correct answer: A. Oxygen and moisture

Solution: Iron rusts in the presence of oxygen and water/moisture.

Shortcut idea: Rust needs air + water.

Important note: Paint or galvanising can reduce rusting.

Correct answer: B. Chemical change

Solution: Combustion forms new substances such as gases and ash.

Shortcut idea: New substances = chemical change.

Important note: Chemical changes are often difficult to reverse.

Correct answer: A. Red

Solution: Acids turn blue litmus red.

Shortcut idea: Acid: blue → red.

Important note: Bases turn red litmus blue.

Correct answer: B. Basic solution

Solution: Turmeric changes toward reddish-brown in alkaline/basic conditions.

Shortcut idea: Turmeric flags bases.

Important note: Indicators help classify solutions; they do not identify every chemical.

Correct answer: B. Solute

Solution: The solute is dissolved by the solvent to form a solution.

Shortcut idea: Solute gets dissolved.

Important note: In salt water, salt is solute and water is solvent.

Correct answer: C. Solid

Solution: Particles in solids are closely packed and vibrate around fixed positions.

Shortcut idea: Solid = closely packed.

Important note: Heating generally increases particle motion.

Correct answer: A. Fast particles escape

Solution: Higher-energy particles escape, lowering the average energy of the remaining liquid.

Shortcut idea: Evaporation removes energetic particles.

Important note: Larger surface area and airflow usually increase evaporation.

Correct answer: B. Nitrogen

Solution: Nitrogen forms about 78% of dry air.

Shortcut idea: Air: about 78% N₂, 21% O₂.

Important note: Carbon dioxide is present in a much smaller fraction.

Correct answer: B. Condensation

Solution: Cooling water vapour leads to condensation.

Shortcut idea: Gas → liquid = condensation.

Important note: The water cycle includes evaporation, condensation and precipitation.

Correct answer: B. Ignition temperature

Solution: A combustible substance must reach its ignition temperature for sustained burning.

Shortcut idea: Fire starts at ignition temperature.

Important note: Fire needs fuel, oxygen and sufficient heat.

Correct answer: B. Coal

Solution: Coal formed from ancient plant matter over geological time.

Shortcut idea: Coal, petroleum, natural gas = fossil fuels.

Important note: Fossil fuels are finite and produce pollution when burned.

Correct answer: B. Nucleus

Solution: The nucleus contains genetic material and helps regulate cell activities.

Shortcut idea: Nucleus = control centre.

Important note: Some mature cells, such as mammalian red blood cells, lack a nucleus.

Correct answer: C. Cell wall

Solution: Plant cells usually have a cellulose cell wall; animal cells do not.

Shortcut idea: Plant cell wall.

Important note: Both plant and animal cells have membranes and mitochondria.

Correct answer: A. Mitochondrion

Solution: Mitochondria are major sites of aerobic respiration and ATP production.

Shortcut idea: Mitochondria = energy release.

Important note: Chloroplasts capture light energy for photosynthesis.

Correct answer: B. Carbon dioxide and water

Solution: Plants use carbon dioxide and water, with light energy, to make sugars.

Shortcut idea: CO₂ + water + light → sugar + O₂.

Important note: Chlorophyll absorbs light; oxygen released comes from water.

Correct answer: B. Oxygen

Solution: Oxygen is released when water molecules are split during photosynthesis.

Shortcut idea: Photosynthesis releases O₂.

Important note: Plants also respire day and night.

Correct answer: B. Xylem

Solution: Xylem conducts water and dissolved minerals through the plant.

Shortcut idea: Xylem = water; phloem = food.

Important note: Phloem transports sugars from source to sink.

Correct answer: B. Root hairs

Solution: Root hairs increase the surface area in contact with soil water.

Shortcut idea: Root hairs absorb.

Important note: Water enters root hairs largely by osmosis.

Correct answer: B. Pollination

Solution: Pollination occurs before fertilisation in flowering plants.

Shortcut idea: Pollen to stigma = pollination.

Important note: Pollination can be aided by wind, water or animals.

Correct answer: A. Suitable temperature

Solution: Most seeds need moisture, oxygen and a suitable temperature to germinate.

Shortcut idea: Water + air + warmth.

Important note: Light requirements vary by species; soil is not essential for germination itself.

Correct answer: B. Phototropism

Solution: Phototropism is directional growth in response to light.

Shortcut idea: Photo = light.

Important note: Roots commonly show positive gravitropism.

Correct answer: B. Vertebrates

Solution: Vertebrates possess a vertebral column.

Shortcut idea: Vertebrate = backbone.

Important note: Invertebrates form the majority of animal species.

Correct answer: B. Reduce resistance in water

Solution: A streamlined shape reduces drag while moving through water.

Shortcut idea: Streamlined = less drag.

Important note: Adaptations improve survival in a particular environment.

Correct answer: B. Heart

Solution: The heart contracts to circulate blood through pulmonary and systemic circuits.

Shortcut idea: Heart = pump.

Important note: Arteries carry blood away from the heart; veins return it.

Correct answer: B. Alveoli

Solution: Alveoli have thin walls and a large surface area for diffusion of gases.

Shortcut idea: Alveoli = exchange.

Important note: Oxygen diffuses into blood and carbon dioxide diffuses out.

Correct answer: A. Small intestine

Solution: The small intestine has villi for efficient nutrient absorption.

Shortcut idea: Small intestine absorbs nutrients.

Important note: The large intestine absorbs much water and salts.

Correct answer: B. Kidneys

Solution: Kidneys remove wastes and regulate water and ion balance.

Shortcut idea: Kidneys → urine.

Important note: Nephrons are the functional units of kidneys.

Correct answer: A. Cerebellum

Solution: The cerebellum coordinates posture, balance and smooth movement.

Shortcut idea: Cerebellum = coordination.

Important note: The medulla helps regulate involuntary functions such as breathing.

Correct answer: A. Lactobacillus bacteria

Solution: Lactic acid bacteria ferment lactose and help form curd.

Shortcut idea: Curd = lactic acid bacteria.

Important note: Not all microorganisms cause disease.

Correct answer: A. Female Anopheles mosquito

Solution: Female Anopheles mosquitoes transmit Plasmodium parasites.

Shortcut idea: Malaria → female Anopheles.

Important note: Mosquito control and preventing bites reduce transmission.

Correct answer: A. Specific immune memory

Solution: Vaccination exposes the immune system to an antigen or its instructions, building immune memory.

Shortcut idea: Vaccine trains immune system.

Important note: Vaccines vary; protection is not always immediate or complete.

Correct answer: B. Fertilisation

Solution: Fertilisation forms a zygote by fusion of gametes.

Shortcut idea: Gametes fuse = fertilisation.

Important note: In flowering plants, fertilisation follows pollination and pollen tube growth.

Correct answer: A. Testosterone

Solution: Testosterone contributes to changes such as facial hair and voice deepening.

Shortcut idea: Testosterone → many male secondary traits.

Important note: Puberty timing varies naturally among individuals.

Correct answer: A. Producers

Solution: Plants produce organic food using sunlight and form the base of many food chains.

Shortcut idea: Plants = producers.

Important note: Energy flows through trophic levels and decreases at each transfer.

Correct answer: A. Decomposers

Solution: Fungi and bacteria decompose dead organisms and recycle nutrients.

Shortcut idea: Fungi/bacteria recycle.

Important note: Decomposition returns nutrients to ecosystems.

Correct answer: C. Sunlight

Solution: Solar energy is replenished continuously on human timescales.

Shortcut idea: Sunlight is renewable.

Important note: Renewable resources can still be overused or have environmental impacts.

Correct answer: A. Eutrophication

Solution: Excess nutrients can trigger algal blooms and oxygen depletion.

Shortcut idea: Nutrients → algal bloom → low oxygen.

Important note: Runoff control helps protect freshwater ecosystems.

Correct answer: A. Reduce, reuse, recycle

Solution: The 3Rs prioritise preventing waste, using items again and recycling materials.

Shortcut idea: Reduce first.

Important note: Reducing consumption often saves more resources than recycling alone.

Correct answer: A. Carbon dioxide

Solution: Burning fossil fuels and land-use change increase atmospheric CO₂.

Shortcut idea: CO₂ traps outgoing heat.

Important note: Greenhouse gases warm the climate by absorbing infrared radiation.

Correct answer: B. It supports ecosystem stability and services

Solution: Diverse ecosystems can support pollination, nutrient cycling, food webs and resilience.

Shortcut idea: Diversity supports resilience.

Important note: Conservation protects species and their habitats.

Correct answer: A. The leaf is 5 cm long

Solution: A measured length is directly observable; the other statements infer hidden states or use anthropomorphism.

Shortcut idea: Measured fact = observation.

Important note: Separate observations from explanations in science.

Correct answer: B. Metre

Solution: The metre is the SI base unit for length.

Shortcut idea: SI length = m.

Important note: Use consistent units before calculating.

Correct answer: B. 5 m/s

Solution: Average speed = distance/time = 150/30 = 5 m/s.

Shortcut idea: Speed = d ÷ t.

Important note: Speed is scalar; velocity includes direction.

Correct answer: C. 100 m

Solution: Distance = speed × time = 20 × 5 = 100 m.

Shortcut idea: d = v × t.

Important note: This assumes constant speed along the path.

Correct answer: B. 10 m/s

Solution: To convert km/h to m/s, multiply by 5/18: 36 × 5/18 = 10.

Shortcut idea: km/h → m/s: ×5/18.

Important note: To convert m/s to km/h, multiply by 18/5.

Correct answer: B. Speed

Solution: A straight line with constant slope means distance changes at a constant rate.

Shortcut idea: Slope of distance-time = speed.

Important note: A horizontal distance-time line means the object is at rest.

Correct answer: B. Newton

Solution: Force is measured in newtons (N).

Shortcut idea: Force = N.

Important note: Pressure is measured in pascals (Pa).

Correct answer: A. Speed or direction

Solution: Forces can alter motion, direction or shape.

Shortcut idea: Force changes motion/shape.

Important note: Balanced forces do not change an object’s velocity.

Correct answer: A. Inertia

Solution: The body tends to continue moving due to inertia.

Shortcut idea: Sudden stop → inertia forward.

Important note: Seat belts provide an external force that helps stop the passenger safely.

Correct answer: B. Doubles

Solution: Newton’s second law: a = F/m. For fixed m, acceleration is proportional to net force.

Shortcut idea: a = F/m.

Important note: Net force, not one isolated force, determines acceleration.

Correct answer: B. Making surfaces rougher

Solution: Rougher surfaces often interlock more and increase friction.

Shortcut idea: Rough = often more friction.

Important note: Friction depends on surface materials and normal force too.

Correct answer: B. To improve grip and channel water

Solution: Tread helps maintain traction and displace water, reducing skidding risk.

Shortcut idea: Tread = traction.

Important note: Tyres still require suitable pressure and condition.

Correct answer: B. Force ÷ area

Solution: Pressure equals perpendicular force divided by contact area.

Shortcut idea: P = F/A.

Important note: For the same force, smaller area means greater pressure.

Correct answer: B. Smaller contact area, greater pressure

Solution: A sharp edge concentrates force over a smaller area.

Shortcut idea: Small area → high pressure.

Important note: Pressure depends on force and area.

Correct answer: A. Depth

Solution: Hydrostatic pressure increases with depth because of the weight of liquid above.

Shortcut idea: Deeper = greater pressure.

Important note: At the same depth in the same stationary liquid, pressure is equal in all directions.

Correct answer: A. Buoyant force

Solution: A floating object is in equilibrium when upthrust equals its weight.

Shortcut idea: Float: upthrust = weight.

Important note: Whether it floats depends on average density and displaced fluid.

Correct answer: B. Gravity

Solution: Earth’s gravitational attraction gives objects weight.

Shortcut idea: Weight = mg near Earth.

Important note: Mass is measured in kg; weight is a force measured in N.

Correct answer: B. Remains approximately the same

Solution: Mass measures inertia and remains approximately constant; weight changes with gravity.

Shortcut idea: Mass constant, weight varies.

Important note: Moon gravity is about one-sixth of Earth’s.

Correct answer: A. Acts with displacement in its direction component

Solution: Work equals force times displacement component along the force.

Shortcut idea: W = F × s (aligned).

Important note: No displacement means mechanical work by that force is zero.

Correct answer: B. Joule

Solution: Energy and work are measured in joules.

Shortcut idea: Energy/work = J.

Important note: Power is the rate of energy transfer and is measured in watts.

Correct answer: A. 200 W

Solution: Power = work/time = 600/3 = 200 W.

Shortcut idea: P = W/t.

Important note: One watt equals one joule per second.

Correct answer: B. Elastic potential energy

Solution: Elastic deformation stores potential energy.

Shortcut idea: Stretched/compressed = elastic potential.

Important note: Energy can transform from one form to another.

Correct answer: A. Changing force direction

Solution: An ideal fixed pulley changes the direction of effort; its mechanical advantage is 1.

Shortcut idea: Fixed pulley = direction change.

Important note: A movable pulley can reduce the effort needed.

Correct answer: D. A vacuum

Solution: Sound requires a material medium to transfer mechanical vibrations.

Shortcut idea: No medium = no sound transmission.

Important note: Sound travels as longitudinal waves in air.

Correct answer: A. Pitch

Solution: Pitch is associated mainly with frequency.

Shortcut idea: Frequency = pitch.

Important note: Amplitude is related to loudness.

Correct answer: A. Vacuum

Solution: Light has its maximum speed in vacuum, about 3 × 10⁸ m/s.

Shortcut idea: Vacuum fastest.

Important note: Light slows in materials and may refract at boundaries.

Correct answer: B. Normal to the surface

Solution: Angles of incidence and reflection are measured from the normal and are equal.

Shortcut idea: Angles from normal.

Important note: A plane mirror forms a virtual, upright image of the same size.

Correct answer: B. Hotter to colder body

Solution: Thermal energy flows spontaneously from higher to lower temperature.

Shortcut idea: Hot → cold.

Important note: Heat is energy transfer; temperature measures thermal state.

Correct answer: B. Amperes

Solution: The SI unit of electric current is the ampere (A).

Shortcut idea: Current = ampere.

Important note: Voltage is in volts; resistance is in ohms.

Correct answer: B. Closed and complete

Solution: A complete conducting path allows current to flow.

Shortcut idea: Closed loop = current.

Important note: A switch opens or closes the circuit.

Correct answer: B. Repel

Solution: Like magnetic poles repel; unlike poles attract.

Shortcut idea: Like repel, unlike attract.

Important note: A freely suspended magnet aligns approximately north–south.

Correct answer: B. Kelvin

Solution: Kelvin is the SI base unit for thermodynamic temperature.

Shortcut idea: SI temperature = K.

Important note: Celsius is widely used in daily life.

Correct answer: B. Human body temperature

Solution: A clinical thermometer is designed for body-temperature range.

Shortcut idea: Clinical = body.

Important note: Digital thermometers avoid mercury exposure.

Correct answer: A. Conduction

Solution: Conduction transfers energy through neighbouring particles without bulk movement of the material.

Shortcut idea: Touching solid → conduction.

Important note: Metals are generally good thermal conductors.

Correct answer: B. Liquids and gases

Solution: Convection involves bulk movement in fluids due to density differences.

Shortcut idea: Fluid movement = convection.

Important note: Warm fluid often rises while cooler fluid sinks.

Correct answer: A. Absorber and emitter of thermal radiation

Solution: Dark, matte surfaces generally absorb and emit thermal radiation effectively.

Shortcut idea: Black/matte = good absorber/emitter.

Important note: Colour alone does not determine all thermal properties.

Correct answer: A. Usually move farther apart on average

Solution: Heating generally increases particle kinetic energy and average separation.

Shortcut idea: Heat → usually expands.

Important note: Water behaves unusually near 0–4°C.

Correct answer: B. Transmits no light through it

Solution: Opaque materials block transmission of visible light.

Shortcut idea: Opaque = no transmission.

Important note: Translucent materials transmit some light; transparent materials transmit most.

Correct answer: A. A small/point-like light source

Solution: A small source creates a clearer boundary between light and shadow.

Shortcut idea: Small source = sharper shadow.

Important note: Shadow size depends on source, object and screen positions.

Correct answer: B. Virtual, upright and same size

Solution: Plane mirrors form virtual, upright images with equal size and lateral inversion.

Shortcut idea: Plane = virtual, upright, same size.

Important note: Image distance behind mirror equals object distance in front.

Correct answer: B. Angle i equals angle r

Solution: For reflection from a plane surface, angle of incidence equals angle of reflection.

Shortcut idea: i = r, measured from normal.

Important note: The incident ray, reflected ray and normal lie in one plane.

Correct answer: A. Refraction

Solution: Light changes speed and direction when passing between water and air.

Shortcut idea: Bent appearance = refraction.

Important note: Refraction depends on refractive indices and angle of incidence.

Correct answer: B. Converging lens

Solution: A convex lens converges parallel rays toward a focal point.

Shortcut idea: Convex = converging.

Important note: A concave lens diverges parallel rays.

Correct answer: B. Retina

Solution: The eye lens focuses light onto the retina, where photoreceptors respond.

Shortcut idea: Retina = image screen.

Important note: The optic nerve carries signals to the brain.

Correct answer: A. Myopia

Solution: Myopia is short-sightedness and is commonly corrected with a concave lens.

Shortcut idea: Myopia → concave lens.

Important note: Hypermetropia is commonly corrected with a convex lens.

Correct answer: A. Amplitude

Solution: Greater amplitude generally corresponds to greater sound intensity and perceived loudness.

Shortcut idea: Amplitude = loudness.

Important note: Perceived loudness also depends on frequency and hearing sensitivity.

Correct answer: A. Frequency

Solution: Higher frequency is perceived as higher pitch.

Shortcut idea: Frequency = pitch.

Important note: Frequency is measured in hertz (Hz).

Correct answer: A. Reflection of sound

Solution: Sound waves reflect from a sufficiently distant surface and return to the listener.

Shortcut idea: Echo = reflected sound.

Important note: A distinct echo typically needs enough time separation from the original sound.

Correct answer: C. Above about 20,000 Hz

Solution: Ultrasound is sound above the upper limit of typical human hearing, about 20 kHz.

Shortcut idea: Ultra = above 20 kHz.

Important note: Ultrasound is used in imaging and some industrial tests.

Correct answer: B. Volt

Solution: Potential difference is measured in volts.

Shortcut idea: Voltage = V.

Important note: A volt is one joule per coulomb.

Correct answer: B. Decrease

Solution: Ohm’s law gives I = V/R; current decreases as resistance rises at fixed voltage.

Shortcut idea: I = V/R.

Important note: Ohm’s law applies to ohmic conductors under suitable constant conditions.

Correct answer: A. The same current

Solution: In a series circuit, the same current passes through each component.

Shortcut idea: Series = same current.

Important note: Adding series resistance generally reduces current for fixed supply voltage.

Correct answer: A. The same two nodes

Solution: Parallel branches share the same potential difference between their endpoints.

Shortcut idea: Parallel = same voltage.

Important note: Household circuits are arranged largely in parallel.

Correct answer: A. Melting when excessive current flows

Solution: Excess current heats the fuse wire until it melts and breaks the circuit.

Shortcut idea: Overcurrent → fuse melts.

Important note: Use a correctly rated fuse and avoid unsafe wiring.

Correct answer: A. Poles

Solution: Field lines are most concentrated near the poles.

Shortcut idea: Lines crowded = stronger field.

Important note: Magnetic field lines outside a magnet conventionally run north to south.

Correct answer: B. Increase current or coil turns

Solution: More coil turns and greater current generally strengthen the field; a soft iron core can help.

Shortcut idea: More turns/current = stronger.

Important note: An electromagnet can be switched on and off.

Correct answer: A. Electrical energy

Solution: Photovoltaic cells convert incident light into electrical energy.

Shortcut idea: Solar cell → electricity.

Important note: Solar thermal collectors instead convert sunlight to heat.

Correct answer: A. Mechanical energy

Solution: The motor converts electrical energy into rotational mechanical energy, with some heat and sound.

Shortcut idea: Fan: electric → motion.

Important note: Energy conversion is never perfectly efficient.

Correct answer: A. Rubbed and charges transfer

Solution: Friction/contact can transfer electrons between materials, leaving net charges.

Shortcut idea: Rubbing can transfer charge.

Important note: Like electric charges repel; unlike charges attract.

Correct answer: A. They trap insulating air

Solution: Wool fibres trap air, and still air is a poor conductor of heat.

Shortcut idea: Trapped air insulates.

Important note: Clothing slows heat loss; it does not generate energy.

Correct answer: A. Water vapour condenses on a cool surface

Solution: A surface cooled below the dew point causes nearby water vapour to condense.

Shortcut idea: Cool surface → condensation.

Important note: Dew is different from rain, which forms in clouds.

Correct answer: B. Predicting, testing and recording results

Solution: Inquiry engages learners in questions, evidence, reasoning and conclusions.

Shortcut idea: Question → predict → test → evidence.

Important note: The teacher guides safe investigation rather than simply supplying every answer.

Correct answer: B. Elicit the idea and design an investigation

Solution: Eliciting prior ideas helps the teacher address misconceptions through evidence and discussion.

Shortcut idea: First diagnose, then investigate.

Important note: Roots absorb water and minerals; plants synthesize sugars through photosynthesis.

Correct answer: B. Inform next teaching steps while learning is happening

Solution: Formative assessment provides feedback to improve teaching and learning during the process.

Shortcut idea: Formative = feedback for improvement.

Important note: Exit tickets, questioning and observation can be formative.

Correct answer: A. Certify or judge learning after a period

Solution: Summative assessment evaluates learning at the end of a unit, term or course.

Shortcut idea: Summative = summary/end.

Important note: Good assessment uses multiple methods and clear criteria.

Correct answer: B. Use a safe controlled comparison and discuss air resistance

Solution: A controlled comparison can test the claim; air resistance must be considered.

Shortcut idea: Test fairly; control variables.

Important note: In a vacuum, objects fall with the same gravitational acceleration near Earth.

Correct answer: A. Amount of light

Solution: The independent variable is deliberately changed by the investigator.

Shortcut idea: Independent = changed.

Important note: Dependent variable is measured; control variables are kept similar.

Correct answer: B. Dependent variable

Solution: Height is an outcome measured to assess the effect of light.

Shortcut idea: Dependent = measured.

Important note: Reliable experiments use repeated measurements where possible.

Correct answer: A. To control a variable

Solution: Keeping water constant helps isolate the effect of light.

Shortcut idea: Fair test = change one factor.

Important note: Other relevant factors include plant type, soil and temperature.

Correct answer: B. Does water temperature affect sugar dissolving time?

Solution: Temperature and dissolving time can be measured under controlled conditions.

Shortcut idea: Measurable variables = testable.

Important note: A good question identifies variables and can be investigated with evidence.

Correct answer: A. To organise and compare data

Solution: Tables make data easier to organise, inspect and compare.

Shortcut idea: Tables reveal patterns.

Important note: Graphs can communicate trends; axes and units must be labelled.

Correct answer: B. Immediately alert the teacher and rinse at the eyewash station

Solution: Prompt reporting and immediate flushing with clean running water/eyewash are standard first responses; follow lab protocol.

Shortcut idea: Eyes: report + rinse immediately.

Important note: Use appropriate PPE and follow the school’s emergency procedures.

Correct answer: B. Provide tactile models and verbal description

Solution: Accessible models and descriptions allow meaningful participation.

Shortcut idea: Offer multiple ways to access concepts.

Important note: Universal design offers varied representations and responses.

Correct answer: B. Tiered tasks and scaffolds toward shared learning goals

Solution: Flexible scaffolds and challenge levels help students access common objectives.

Shortcut idea: Same goal, varied support.

Important note: Use evidence of learning to adjust support.

Correct answer: C. What evidence would distinguish evaporation from boiling?

Solution: It asks learners to compare concepts and justify an answer with evidence.

Shortcut idea: Ask “why/how/evidence?”

Important note: Recall questions are useful too, but should not dominate inquiry.

Correct answer: A. Explains what it represents and its limits

Solution: Models simplify reality; discussing their scope prevents new misconceptions.

Shortcut idea: Model = useful simplification, not reality.

Important note: Use concrete, visual and symbolic representations as appropriate.

Correct answer: A. They connect concepts with learners’ experiences

Solution: Familiar contexts can make abstract ideas meaningful and invite observation.

Shortcut idea: Connect known → new.

Important note: Local examples should still be scientifically accurate.

Correct answer: A. Treat home language as a learning resource

Solution: Learners can reason in familiar languages while learning precise scientific vocabulary.

Shortcut idea: Language supports thinking.

Important note: Introduce technical terms clearly and consistently.

Correct answer: A. Collaboration and evidence-based argument

Solution: Students share roles, compare evidence and explain reasoning.

Shortcut idea: Roles + evidence + reflection.

Important note: Use individual checks to see what each learner understands.

Correct answer: A. Connect ideas with evidence and process skills

Solution: Experiments support observation, measurement, reasoning and theory testing.

Shortcut idea: Practical + reflection = learning.

Important note: A demonstration alone is not automatically inquiry-based.

Correct answer: B. Test several metals and refine the claim

Solution: Testing copper, aluminium and other samples challenges overgeneralisation.

Shortcut idea: Sample more than one case.

Important note: Evidence supports a narrower claim: some metals are strongly magnetic.

Correct answer: A. Changing a claim when reliable evidence contradicts it

Solution: Scientific reasoning is open to revision in response to evidence.

Shortcut idea: Evidence over ego.

Important note: Scientific conclusions are provisional and testable.

Correct answer: A. Measure and classify waste systematically

Solution: A baseline audit provides evidence about types and amounts of waste.

Shortcut idea: Measure before proposing.

Important note: Avoid handling hazardous waste; follow school safety rules.

Correct answer: B. Recognised public-health agency or qualified professional

Solution: Credible agencies use evidence review and publish accountable guidance.

Shortcut idea: Check author, evidence, date and institution.

Important note: Critical evaluation is essential for health information.

Correct answer: A. Science, technology, engineering and mathematics

Solution: Learners apply material properties, iterative design, measurement and numerical comparison.

Shortcut idea: Design → test → improve.

Important note: Failure during prototyping is useful evidence.

Correct answer: A. Local observation followed by evidence-based action

Solution: Investigating a local issue and taking realistic action connects knowledge to responsibility.

Shortcut idea: Observe → analyse → act.

Important note: Discuss individual, community and policy-level responses.

Correct answer: A. Makes success criteria explicit

Solution: Rubrics communicate dimensions of quality and support consistent feedback.

Shortcut idea: Clear criteria = transparent assessment.

Important note: A rubric can assess process skills as well as final answers.

Correct answer: A. Use units and compare the same object on Earth and Moon

Solution: Comparing kg for mass with N for weight and varying gravity makes the distinction concrete.

Shortcut idea: Mass kg; weight N.

Important note: Weight = mass × gravitational field strength.

Correct answer: A. Show relationships among ideas

Solution: Maps make connections among concepts visible and can reveal gaps in understanding.

Shortcut idea: Connect concepts, not just list them.

Important note: Ask students to explain the links they draw.

Correct answer: C. Construct a closed circuit and explain why a bulb lights

Solution: The objective names an observable performance and a conceptual explanation.

Shortcut idea: Use an observable verb.

Important note: Align learning activity and assessment with the objective.

Correct answer: B. Review how current flows in a closed circuit, then test your diagram

Solution: Specific, actionable feedback identifies a next step and supports improvement.

Shortcut idea: Feedback = what + next step.

Important note: Feedback should address the work, not label the learner.