Grade 9 Science Worksheets

Learning Objectives

• Explain how negative and positive feedback mechanisms help maintain internal conditions within narrow limits.
• Describe sensor-effector loop logic and the role of set points in feedback control.
• Compare rapid corrective responses with slower hormonal adjustments using real physiological examples.

Learning Objectives

• Construct phylogenetic trees from morphological characters and molecular sequence data using cladistic principles.
• Interpret branching diagrams by identifying shared derived characters, sister taxa, and implied evolutionary relationships.
• Compare tree-building approaches (parsimony and molecular distance) and explain how molecular clocks calibrate time.+ Show more

Learning Objectives

• Explain how photosynthesis and cellular respiration transfer energy between autotrophs and heterotrophs.
• Analyze how net primary productivity (NPP) and respiration rates influence biomass accumulation and energy availability.
• Use carbon and oxygen cycle ideas to interpret ecosystem carbon budgets and coastal/algal productivity.

Learning Objectives

• Explain how energy is transferred and lost across trophic levels using trophic pyramids and ecological efficiency.
• Describe how food webs are structured and how predators and prey can influence energy flow through top-down and bottom-up control.
• Quantify relationships among production, biomass, and ecological efficiency using kelp-forest and grassland style examples.

Learning Objectives

• Describe key mechanisms of asexual reproduction (binary fission, budding, spore formation, and vegetative propagation).
• Explain genetic and ecological consequences of producing clones compared with sexual reproduction.
• Apply concepts to Alberta examples such as aspen root-sucker groves and horticultural propagation.

Learning Objectives

• Compare sexual and asexual reproduction in terms of genetic variation
• Identify examples of reproductive strategies found in Alberta ecosystems
• Explain ecological trade-offs between population growth and genetic diversity

Learning Objectives

• Explain how element symbols represent elements and how their capitalization affects meaning.
• Interpret chemical formulas using subscripts to determine relative numbers of atoms.
• Convert between written descriptions and formulas for common substances.

Learning Objectives

• Describe how solids, liquids, and gases differ in structure and properties (lattice arrangement, fluidity, and compressibility).
• Explain phase changes using temperature/pressure changes and energy transfer (heating and cooling).
• Use particle ideas to predict how matter behaves during freezing, melting, evaporation, condensation, and sublimation.

Learning Objectives

• Explain how greenhouse gas forcing, albedo changes, aerosol effects, and land-use feedbacks influence Earth’s energy balance.
• Describe basic radiative transfer and the idea of an energy budget imbalance that leads to temperature change.
• Connect human emissions to carbon cycle perturbations and to projected climate responses.+ Show more

Learning Objectives

• Explain how resistive losses, power factor, and device selection affect electrical system efficiency.
• Use key metrics (e.g., real vs apparent power, efficiency, and loss mechanisms) to compare design options.
• Evaluate energy-saving strategies while considering real-world constraints such as infrastructure and operating requirements.

Learning Objectives

• Explain mechanical advantage as a ratio that compares input force to load force (or input distance to load distance).
• Calculate and interpret mechanical advantage for levers and pulley systems, including how they affect force and displacement.
• Describe trade-offs between force reduction and increased movement distance in common machines.+ Show more

Learning Objectives

• Explain how integrated models couple geosphere, hydrosphere, atmosphere, and biosphere processes using variables and parameters.
• Identify how model structure affects outputs when testing parameter sensitivity and scenario assumptions.
• Describe how uncertainty can be propagated to produce indicator-based predictions for environmental change.

Learning Objectives

• Explain how constraints limit the design space in engineering systems.
• Identify common constraint types (materials, cost, power, regulatory, environmental) and connect them to requirements.
• Use constraint analysis to predict feasible performance and justify engineering trade-offs.+ Show more

Learning Objectives

• Explain how engineers define a problem using success criteria and constraints (resources, materials, time, and safety).
• Identify how scientific principles and evidence connect to measurable performance in an engineering solution.
• Use models to link design features to expected outcomes under real-world limitations.

Learning Objectives

• Explain how engineering design uses scientific understanding to meet human and societal needs.
• Identify how performance requirements like access, reliability, and safety guide engineering choices.
• Evaluate how technology decisions can affect equity and long-term usability.+ Show more

Learning Objectives

• Explain how optimization improves a design while managing tradeoffs among competing goals and constraints
• Identify variables, metrics, and constraints used to compare design alternatives using evidence or models
• Evaluate why multiple “best” solutions may exist depending on how criteria and limits are chosen

Learning Objectives

• Differentiate physical properties and chemical properties of matter using examples
• Distinguish physical changes from chemical changes based on evidence
• Interpret observations (color, temperature, texture, gas/product formation) to classify changes

Learning Objectives

• Explain how scientific conclusions depend on evidence, models, and measurement rather than a single method
• Identify how limitations, assumptions, and technology can influence observations and interpretation
• Evaluate how peer review can strengthen reliability and how new measurements can change scientific models+ Show more

Learning Objectives

• Explain how carbon records from ice cores, marine sediments, and terrestrial proxies preserve evidence of past atmospheric composition and climate.
• Describe how isotopes, gas ratios, and carbon flux information can be used to identify seasonal cycles, abrupt shifts, and long-term trends.
• Compare natural variability shown in proxy records with recent anthropogenic increases using concepts of timing and magnitude.

Learning Objectives

• Explain how protons, neutrons, and electrons form an atom’s structure and determine atomic identity and behavior.
• Differentiate atomic number, atomic mass, and isotopes using the roles of nucleons (protons and neutrons).
• Use electron energy regions to predict why atoms form different bonding patterns.

Learning Objectives

• Explain how net force and mass affect an object’s acceleration using proportional reasoning
• Identify the importance of direction when dealing with force and acceleration as vectors
• Apply the idea of net force to predict speeding up, slowing down, or changing direction

Learning Objectives

• Resolve gravitational force into components parallel and perpendicular to an inclined plane and relate them to net force and acceleration.
• Explain how mechanical advantage changes the required applied force on an inclined plane, trading force for distance.
• Analyze how friction and the slope angle affect motion and determine qualitative energy/work outcomes.

Learning Objectives

• Explain how multiple lines of evidence (fossils, anatomy, and molecular data) support evolutionary relationships.
• Compare homologous and analogous structures and connect each to evolutionary interpretation.
• Use evidence integration to describe how scientists infer timing and patterns of descent with modification.

Learning Objectives

• Explain how key biotechnology techniques (PCR, gel electrophoresis, DNA sequencing, and CRISPR) work for genetic analysis and modification.
• Describe real-world applications of biotechnology in diagnostics, medicine, agriculture, forensics, and synthetic biology.
• Evaluate ethical, legal, and societal considerations related to genetic data, environmental impact, and equitable access.

Learning Objectives

• Describe the overall inputs and outputs of photosynthesis in chloroplasts.
• Explain how light-dependent reactions and carbon fixation work as separate, connected stages.
• Identify the roles of pigments, electron transport, ATP, and NADPH in converting solar energy to chemical energy.

Learning Objectives

• Explain how passive transport, osmosis, and active transport move substances across cell membranes
• Distinguish vesicular transport (endocytosis and exocytosis) from movement across the membrane
• Relate membrane transport to homeostasis, including volume regulation and nutrient uptake

Learning Objectives

• Explain how the nephron controls fluid and electrolyte balance through filtration, reabsorption, and secretion.
• Describe how hormones (ADH and the renin–angiotensin–aldosterone system) adjust kidney function to maintain homeostasis.
• Interpret how changes in blood volume and osmolarity lead to specific physiological responses.

Learning Objectives

• Explain how organelles work together as an integrated system to support cell metabolism and maintenance
• Describe how transport vesicles and the cytoskeleton help move proteins and lipids between compartments
• Connect specific organelle functions (chloroplasts, mitochondria, ER, peroxisomes) to system-level cell outcomes

Learning Objectives

• Compare prokaryotic (bacterial and archaeal) cell structures with eukaryotic cells.
• Identify key features of prokaryotic organization, including nucleus absence, nucleoid DNA, ribosomes, and plasmids.
• Explain how cell wall and membrane differences relate to prokaryote survival in different environments.

Learning Objectives

• Explain how computational models use equations, functions, and simulation to predict system performance.
• Develop and interpret performance objective functions for design decision-making.
• Describe how parameter estimation and sensitivity analysis support model tuning and uncertainty awareness.+ Show more

Learning Objectives

• Identify functional requirements and distinguish them from constraints in an engineering problem frame.
• Analyze competing constraints (social, economic, regulatory, environmental, and safety) to prioritize design choices.
• Use qualitative reasoning and basic quantitative bounds to judge feasibility of a conceptual solution.+ Show more

Learning Objectives

• Explain how heritable variation and environmental pressures can cause differential survival and reproduction in a population.
• Describe how allele frequencies can change under directional, stabilizing, and disruptive selection using fitness ideas.
• Connect natural selection to measurable genetic and trait shifts across generations.

Learning Objectives

• Explain how carbon, nitrogen, and phosphorus cycle through ecosystems using reservoirs and fluxes.
• Describe microbial decomposition processes and how they affect nutrient availability and primary productivity.
• Use mass-balance reasoning to predict how changes in nutrient inputs and cycling rates can alter long-term ecosystem outcomes.+ Show more

Learning Objectives

• Explain how major genetic technologies can introduce or change traits in crops and livestock.
• Compare selective breeding, hybridization, genetic modification, and gene editing in terms of what each changes.
• Describe how trait effects can differ at molecular vs. population scales in agricultural settings.+ Show more

Learning Objectives

• Explain how mutation, recombination during meiosis, gene flow, and chromosomal rearrangements create genetic variation
• Describe how mutation rate and mutation type can affect genetic diversity in populations
• Use real-world examples to predict how genetic variation changes when organisms are introduced or hybridize in managed systems

Learning Objectives

• Explain how fertilization leads to zygote formation and early embryonic development
• Compare internal and external fertilization using real-world habitat examples
• Describe how temperature, moisture, and habitat quality influence developmental success and population dynamics

Learning Objectives

• Explain how mechanical energy can change between kinetic and potential forms when forces do work.
• Use energy conservation and energy bookkeeping to predict feasible speeds and heights when losses are small.
• Identify how non-conservative forces (like friction and air resistance) dissipate mechanical energy.

Learning Objectives

• State the conservation of mass principle for closed systems during chemical reactions.
• Use mass accounting to predict and explain the relationship between reactant mass and product mass.
• Distinguish true mass conservation from apparent mass changes caused by gas exchange in open systems.+ Show more

Learning Objectives

• Explain how friction and aerodynamic drag oppose motion and convert mechanical energy into thermal energy
• Use qualitative relationships (surface texture, normal force, speed, air density, and shape) to predict changes in friction and drag
• Apply coefficients of friction and drag coefficients conceptually to estimate resistance forces

Learning Objectives

• Describe dissolution using solute–solvent interactions and explain how these interactions influence solubility.
• Differentiate saturated, unsaturated, and supersaturated solutions using qualitative examples such as sugar and salt in water.
• Explain how temperature and agitation affect solubility and relate these to practical methods like evaporation and crystallization.

Learning Objectives

• Explain how choosing a reference frame changes an observer’s measured speed, direction, and displacement
• Use vector addition to combine velocities and predict motion in relative-motion scenarios
• Distinguish between true acceleration in an inertial frame and apparent changes described in another frame

Learning Objectives

• Explain how compound machines combine multiple simple machines to change force and motion.
• Calculate ideal mechanical advantage using force relationships and displacement-based reasoning.
• Differentiate ideal mechanical advantage from actual performance by accounting for friction and deformation.+ Show more

Learning Objectives

• Explain how ATP connects catabolic and anabolic reactions using cellular energy coupling
• Compare electron transport chains in photosynthesis and cellular respiration and predict how changes in flux affect energy yield
• Use simplified stoichiometry and energy-diagram reasoning to connect molecular processes to organism-level energy budgets+ Show more

Learning Objectives

• Explain how mitochondria, chloroplasts, endoplasmic reticulum, and lysosomes contribute to cellular maintenance and metabolic pathways.
• Connect organelle internal structures (cristae, thylakoid stacks, folded membranes) to specific functional outcomes (ATP synthesis, light capture, macromolecule processing).
• Use compartmentation and energy-flow ideas to describe how cells coordinate anabolic and catabolic reactions efficiently.

Learning Objectives

• Explain how allele frequencies are expected to change under selection, genetic drift, migration, and mutation.
• Use the Hardy-Weinberg equilibrium idea as a null model to identify when evolution is likely occurring.
• Interpret selection coefficients, fitness landscapes, and effective population size to predict evolutionary outcomes.+ Show more

Learning Objectives

• Explain how seafloor age patterns and paleomagnetic stripes provide evidence for seafloor spreading.
• Describe how earthquake distributions reveal the location and type of plate boundary.
• Distinguish divergent, convergent, and transform margins by their mechanisms and characteristic landforms.+ Show more

Learning Objectives

• Interpret P-wave and S-wave arrival times to infer distance from an earthquake source.
• Use travel-time curves and waveform features (amplitude and frequency) to compare shallow vs. deep events.
• Connect epicenter maps and seismicity patterns to plate interactions and likely rupture behavior.

Learning Objectives

• Describe how materials and energy move between the geosphere, hydrosphere, atmosphere, and biosphere using conceptual models.
• Use mass-balance thinking and causal chains to explain coupled Earth-system phenomena (e.g., nutrient transport, gas flux, ocean upwelling).
• Interpret surface processes as signals that can change over time using baseline representations.