Grade 9 Science Worksheets

Learning Objectives

• Explain how glycolysis, the citric acid cycle, and oxidative phosphorylation produce ATP.
• Describe how mitochondrial structure supports a proton gradient and ATP synthase activity.
• Compare aerobic and anaerobic pathways and relate them to tissue needs during exertion.+ Show more

Learning Objectives

• Explain how Earth’s rotation and orbital motion produce observable daily and yearly cycles.
• Distinguish solar day and sidereal day and relate them to Earth’s motion around the Sun.
• Describe how geometry and periodic gravitational effects lead to predictable changes in what we observe from Earth.

Learning Objectives

• Explain how energy from the Sun and Earth’s interior is transferred through radiation, conduction, and convection.
• Describe how energy gradients drive atmospheric and oceanic circulation and influence weathering and tectonic activity.
• Connect radioactive decay to long-term heat production, mantle convection, and volcanic activity.

Learning Objectives

• Explain how Earth–Moon–Sun geometry creates lunar phases and why the Moon’s orbit makes the pattern repeat.
• Distinguish solar and lunar eclipses and classify partial, total, and annular eclipses using relative alignments.
• Describe the roles of orbital inclination and node alignment in when eclipses can occur.+ Show more

Learning Objectives

• Identify and distinguish common reaction types: synthesis, decomposition, single displacement, double displacement, and combustion.
• Use reactant-to-product patterns to anticipate products and recognize typical observable evidence for each reaction type.
• Apply conservation of mass to check whether a proposed reaction outcome is consistent with given reactants.

Learning Objectives

• Describe major carbon reservoirs in the atmosphere, biosphere, oceans, and geosphere.
• Explain how carbon moves through pathways such as photosynthesis, respiration, dissolution, and sedimentation.
• Quantify the idea of residence time and interpret how human emissions perturb natural carbon budgets.+ Show more

Learning Objectives

• Explain how negative feedback helps maintain glucose homeostasis using insulin and glucagon.
• Describe how hormones act through receptor-mediated pathways and change cell function over time.
• Compare negative and positive feedback loops and relate them to stability and regulation.+ Show more

Learning Objectives

• Explain hierarchical levels of organization from cells to systems using correct scientific vocabulary.
• Describe how cell specialization and extracellular matrices contribute to emergent organ functions.
• Interpret how tissue arrangement and transport at interfaces affect physiological capacity and constraints.

Learning Objectives

• Explain how physical barriers like skin and mucosa limit pathogen entry.
• Compare innate and adaptive immune defenses, including roles of macrophages, lymphocytes, and antibodies.
• Describe how antigen recognition and inflammation support immune responses and recovery.+ Show more

Learning Objectives

• Explain how glomerular filtration is driven by hydrostatic and oncotic pressures
• Describe nephron processes of selective reabsorption, secretion, and urine concentration
• Connect kidney regulation of electrolytes, acid–base balance, and blood pressure to homeostasis and endocrine signals

Learning Objectives

• Explain how nutrition, physical activity, tobacco exposure, pollutant inhalation, and sleep patterns can affect human health
• Describe cellular and system-level mechanisms (oxidative stress, chronic inflammation, membrane transport changes, disrupted hormonal signaling) that connect lifestyle to disease risk
• Distinguish correlation from causation by interpreting evidence and reasoning about possible reversibility of functional impairments

Learning Objectives

• Explain how extraction of Earth resources can alter habitats and landforms.
• Describe how pollution and water withdrawal can move contaminants through Earth systems.
• Evaluate sustainability using renewability, cumulative impacts, and reclamation potential.

Learning Objectives

• Explain how environmental exposures and lifestyle factors can contribute to chronic disease through biological mechanisms.
• Describe how dose–response relationships and vulnerability factors affect health outcomes over time.
• Compare epidemiological evidence with mechanistic evidence when evaluating health risks from pollutants and toxicants.

Learning Objectives

• Explain how diffusion at the alveolar–capillary interface depends on partial pressure gradients, surface area, and membrane thickness.
• Describe how ventilation mechanics and anatomical dead space affect gas exchange during breathing.
• Identify factors that influence oxygen uptake and carbon dioxide removal, including haemoglobin affinity and perfusion matching.+ Show more

Learning Objectives

• Explain how feedback mechanisms help maintain homeostasis in the human body.
• Describe how circulation, respiration, kidneys, and the nervous system interact to support survival.
• Use examples of thermoregulation, acid–base balance, and stress responses to predict system crosstalk.

Learning Objectives

• Explain how action potentials and synaptic transmission allow information to travel through neural pathways.
• Describe how myelination and synaptic structure affect conduction velocity and neural processing capacity.
• Compare how central integration coordinates behavior through reflex arcs and autonomic pathways.

Learning Objectives

• Compare the four principal tissue classes by cellular organization and key functions.
• Explain how extracellular matrix properties relate to connective tissue mechanics.
• Differentiate muscle tissue types based on contractile behavior and control.+ Show more

Learning Objectives

• Define physical properties as observable or measurable characteristics that do not change the chemical identity of a substance.
• Classify materials using physical properties such as density, melting point, boiling point, colour, hardness, and conductivity.
• Distinguish intensive and extensive physical properties and predict how they behave in different samples.

Learning Objectives

• State the principle of conservation of mass for chemical reactions in closed systems.
• Use mass accounting to predict whether reactants and products can have equal total mass.
• Distinguish true mass conservation from apparent mass changes caused by gas exchange.

Learning Objectives

• Explain how solutes move across membranes by simple diffusion, facilitated diffusion, osmosis, and active transport.
• Describe how electrochemical gradients and membrane potential affect the direction and efficiency of ion transport.
• Distinguish paracellular and transcellular pathways in epithelial layers and relate them to nutrient and ion exchange in the body.

Learning Objectives

• Explain how compound machines combine simple machines to change force and distance
• Calculate ideal mechanical advantage using force and displacement relationships
• Differentiate ideal mechanical advantage from real performance after losses+ Show more

Learning Objectives

• Construct a free-body diagram for an isolated object by identifying forces and their directions.
• Use consistent coordinate choices to compute net force and predict acceleration or equilibrium.
• Differentiate common forces on free-body diagrams, including weight, normal force, tension, and friction.

Learning Objectives

• Explain phase changes using energy transfer and the motion of particles.
• Identify what happens to temperature, particle motion, and potential energy during melting, vaporization, sublimation, and condensation.
• Interpret qualitative heating and cooling curves, including temperature plateaus and latent heat.

Learning Objectives

• Explain how chemical properties affect persistence in the environment and potential exposure routes
• Evaluate trade-offs between usefulness of everyday chemicals and health or environmental risks using evidence
• Describe safe handling and disposal choices based on exposure prevention and regulatory guidance

Learning Objectives

• Classify forces as contact forces or non-contact forces using common examples.
• Identify the magnitude, direction, and point of application qualitatively in everyday situations.
• Describe action–reaction pairs for forces between two interacting objects.

Learning Objectives

• Describe dissolution in terms of solute–solvent interactions and qualitative solubility behaviour
• Differentiate unsaturated, saturated, and supersaturated solutions using simple examples
• Explain how temperature and agitation affect solubility qualitatively+ Show more

Learning Objectives

• Explain how cell organelles in eukaryotic cells support specific functions, including transport, energy production, and protein synthesis.
• Relate membrane structure and compartmentalization (folding and surface area) to metabolic rates and effective exchange.
• Connect nucleus/chromatin organization and cytoskeletal elements to how cells maintain control, shape, and transport.

Learning Objectives

• Explain gas pressure using the particle model, focusing on particle collisions with container walls.
• Describe how changes in gas volume and temperature qualitatively affect pressure.
• Connect microscopic particle motion to observable gas behaviours in everyday contexts.

Learning Objectives

• Differentiate physical changes from chemical changes using evidence such as state, form, and macroscopic indicators
• Describe melting, freezing, evaporation, condensation, and dissolution as physical changes and identify whether they are reversible
• Explain how energy transfer accompanies phase changes using everyday examples

Learning Objectives

• Differentiate static friction and kinetic friction in terms of relative motion and resistance
• Describe how drag depends on speed, medium density, and cross-sectional area
• Use friction coefficients and drag regimes to reason about net force and energy dissipation

Learning Objectives

• Explain how kinetic and potential energy interconvert in a system when non-conservative forces are negligible.
• Use work done by non-conservative forces to predict changes in total mechanical energy.
• Apply energy conservation ideas to height–speed situations and mass–spring situations.

Learning Objectives

• Compare how simple machines change input force, output force, and displacement.
• Explain the relationship between mechanical advantage and ideal mechanical advantage.
• Identify key parts and use cases of levers, pulleys, inclined planes, wedges, wheel and axle, and screws.

Learning Objectives

• Explain power as the rate of energy transfer and use the correct units to compare power values.
• Differentiate average power and instantaneous power in simple energy-transfer situations.
• Calculate and interpret mechanical efficiency as useful work or output energy divided by input energy.+ Show more

Learning Objectives

• Identify Newton’s third law action–reaction force pairs between two interacting objects
• Explain that action–reaction forces have equal magnitude and opposite direction but act on different objects
• Distinguish internal and external forces when choosing a system for momentum and Newton’s laws

Learning Objectives

• Explain Newton’s second law using the idea that net force is proportional to mass times acceleration.
• Distinguish mass from weight and connect the difference to acceleration using net force.
• Use vector reasoning (direction of net force and acceleration) and check units in force, mass, and acceleration problems.

Learning Objectives

• Define mechanical work as work = force × displacement in the direction of the force (scalar quantity) and apply it to constant forces.
• Distinguish kinetic energy and potential energy and relate them to energy transfer in simple systems.
• Use correct units for work, energy, and power, and interpret energy conservation in isolated systems.

Learning Objectives

• Represent forces as vectors with magnitude and direction in two dimensions
• Resolve a force into perpendicular components and describe what each component means
• Calculate a net/resultant force using analytical methods (components) and explain the role of direction+ Show more

Learning Objectives

• Explain Newton’s first law using the relationship between net external force and changes in motion
• Distinguish between rest and constant velocity as cases of zero net external force
• Use examples involving friction and low-friction surfaces to predict how motion changes

Learning Objectives

• Calculate work using W = F d cos(θ) for constant forces at an angle to displacement.
• Explain why the work from a variable force can be found from the area under a force–distance graph.
• Choose the correct method for computing work in everyday physics situations.

Learning Objectives

• Explain the particle model using particle motion, spacing, and forces to describe solids, liquids, and gases.
• Relate kinetic energy to temperature and predict how temperature changes particle motion.
• Use microscopic particle behaviour to justify macroscopic observations such as diffusion and gas pressure.

Learning Objectives

• Explain why chemical equations must be balanced to conserve atoms and mass
• Interpret balanced equations as particle-level ratios represented by coefficients
• Use reactant and product formulas to identify which substances are consumed and produced

Learning Objectives

• Interpret position–time graphs to determine velocity from slope.
• Interpret velocity–time graphs to determine acceleration from slope.
• Use area under a velocity–time graph to find displacement over an interval.+ Show more

Learning Objectives

• Describe chemical properties as tendencies to undergo specific chemical changes.
• Identify evidence of chemical change, such as new substances, gas evolution, precipitate formation, and permanent colour change.
• Distinguish chemical changes from physical changes using reaction observations and product evidence.

Learning Objectives

• Use constant-acceleration kinematic equations to relate displacement, initial velocity, final velocity, acceleration, and time.
• Apply v = u + at and s = ut + 0.5at² (and related forms) to solve 1D motion problems with consistent sign conventions.
• Distinguish between vertical free-fall and horizontal/projected motion by treating components separately.

Learning Objectives

• Explain how an element’s identity is determined by its number of protons.
• Use atomic symbols to identify and compare representative elements.
• Describe how atomic models represent atomic identity using symbols and atomic mass.

Learning Objectives

• Differentiate homogeneous and heterogeneous mixtures using examples and particle-level reasoning
• Explain how physical properties such as particle size, solubility, boiling point, and density can separate mixtures
• Describe separation methods (filtration, distillation, magnetic separation, and decanting) in terms of what property they use

Learning Objectives

• Describe chemical change as a process that forms new substances with different properties and composition.
• Identify observable indicators of chemical change such as temperature change, gas production, precipitate formation, and persistent color change.
• Explain, at a microscopic level, how reactants rearrange to form products, and distinguish chemical evidence from physical changes.

Learning Objectives

• Use balanced chemical equations and conservation of mass to relate reactant and product amounts.
• Convert between moles, mass, and particle counts using molar mass.
• Determine the limiting reactant and predict product yield from stoichiometric ratios.