Grade 9 Science Worksheets

Learning Objectives

• Explain how biodiversity includes species diversity and genetic variation within ecosystems.
• Describe how environmental and human-caused changes can alter population sizes and species interactions.
• Evaluate how changes in biodiversity can affect ecosystem stability and functions.

Learning Objectives

• Explain how limiting factors (resources, predation, disease, and environment) constrain population growth.
• Describe the relationship between limiting factors and carrying capacity.
• Analyze how changes in limiting factors can shift community interactions and biodiversity.

Learning Objectives

• Explain major sources of mutations, including replication errors and environmental mutagens such as radiation and chemicals.
• Describe how different types of DNA mutations (point mutations, insertions/deletions, and chromosomal changes) can affect gene function or regulation.
• Connect heritable mutations to how genetic variation becomes the raw material for natural selection and evolution.

Learning Objectives

• Explain how changes in greenhouse gases can trigger feedbacks that amplify or reduce Earth’s energy imbalance
• Describe at least two feedback pathways involving water vapor and ice/snow reflectivity
• Analyze how clouds and atmospheric circulation can affect the balance of incoming solar energy and outgoing infrared radiation+ Show more

Learning Objectives

• Explain power as the rate of energy transfer or the rate of doing work
• Use time and energy information to compare power in different situations
• Interpret real-world examples (such as appliances and motors) using rate reasoning

Learning Objectives

• Explain Newton’s Third Law using the idea of action–reaction pairs that act on different objects
• Identify forces in a scenario and determine the direction and relative size of the matching third-law force
• Predict how force pairs affect the motion of each object involved+ Show more

Learning Objectives

• Explain how changes in surface albedo can either amplify or reduce climate warming through feedback loops.
• Use cause-and-effect reasoning to describe how melting ice and snow influence the amount of solar energy absorbed by Earth.
• Analyze how clouds and vegetation can create additional albedo-related feedbacks at regional scales.+ Show more

Learning Objectives

• Explain how the Sun, Moon, and Earth alignment creates solar and lunar eclipses
• Compare the order of bodies (relative positions) for solar vs. lunar eclipses
• Describe how orbital inclination affects eclipse frequency and where totality can be observed

Learning Objectives

• Explain how greenhouse gases affect Earth’s energy balance using the idea of trapped outgoing longwave radiation.
• Describe how natural and human sources change greenhouse gas concentrations and radiative forcing.
• Analyze how long-lived greenhouse gases influence climate responses over time.

Learning Objectives

• Explain how the changing geometry between the Sun, Earth, and Moon causes the visible lunar phases.
• Describe the synodic month and why lunar phases repeat in a predictable sequence.
• Use illuminated fraction and viewing perspective to predict which phase comes next.

Learning Objectives

• Explain how gravitational interactions between the Moon and Sun, along with orbital motion effects, create tides
• Differentiate spring tides and neap tides based on the alignment of the Moon and Sun
• Analyze how local coastline shape, ocean depth, and resonant basins influence tidal range and current speed+ Show more

Learning Objectives

• Explain how electrons fill energy levels and orbitals using electron configuration rules.
• Identify valence electrons and predict how they affect reactivity and ion formation.
• Use electron configuration ideas to connect periodic trends (atomic size and ionization energy) to shell structure.

Learning Objectives

• Classify chemical reactions into synthesis, decomposition, single displacement, double displacement, and combustion categories
• Connect each reaction category to typical reactant patterns and characteristic products
• Use particle/bond/ion ideas to predict likely products and check consistency with redox trends

Learning Objectives

• Compare prokaryotic and eukaryotic cell structures, including organelles and chromosomes.
• Explain how the presence or absence of membrane-bound organelles affects cell functions.
• Use structural differences to predict differences in size, complexity, and metabolic capabilities.

Learning Objectives

• Explain how innate and adaptive immunity work together to maintain homeostasis during infection or injury
• Describe how immune cells coordinate inflammation and repair using chemical and cellular signals
• Connect immune function with circulatory and endocrine system roles in transporting signals and regulating body processes+ Show more

Learning Objectives

• Explain how adaptive radiation leads to rapid diversification from a single ancestral lineage into multiple species
• Describe the roles of ecological niches, key innovations, and varying selective pressures in driving trait and behavior differences
• Interpret how models help scientists study rates of lineage splitting and trait evolution over time and space

Learning Objectives

• Explain the difference between primary and secondary ecological succession after disturbance or colonization.
• Identify how species turnover and changing resource availability drive changes in community composition over time.
• Use cause-and-effect reasoning to describe feedbacks that influence habitat conditions and ecosystem stability.+ Show more

Learning Objectives

• Explain how catabolic and anabolic pathways connect to meet an organism’s energy needs across tissues
• Describe how hormonal and nutrient signals redirect metabolic intermediates toward ATP production, storage, or biosynthesis
• Compare immediate post-translational control with longer-term changes in enzyme expression and organelle activity

Learning Objectives

• Explain how photons drive charge separation in photosystems during the light reactions.
• Describe how an electron transport chain creates a proton gradient that powers ATP synthase.
• Connect water splitting to electron replenishment and oxygen release.

Learning Objectives

• Explain how pulmonary ventilation and cardiovascular transport work together to deliver oxygen and remove carbon dioxide.
• Describe how heart rate, stroke volume, and vascular resistance can change in response to respiratory and metabolic demands.
• Use chemoreceptor feedback to predict how changes in blood gases affect ventilation and circulation.+ Show more

Learning Objectives

• Explain how ligands bind to receptors and initiate signal transduction inside cells
• Describe how second messengers and phosphorylation help relay and amplify signals
• Compare autocrine, paracrine, endocrine, and synaptic signaling by distance and time scale+ Show more

Learning Objectives

• Explain how the hypothalamus connects neural signals to hormonal control through releasing factors.
• Describe the roles of portal vessels and fenestrated capillaries in neuroendocrine regulation.
• Identify tropic hormones and their effects on target organs involved in metabolism, growth, reproduction, and stress.

Learning Objectives

• Explain how the hypothalamus and thermoreceptors coordinate heat gain and heat loss through feedback loops.
• Describe how the skin and vasculature adjust heat loss using vasoconstriction and vasodilation.
• Analyze how sweating, shivering, and metabolic-rate changes affect body temperature under different environmental conditions.

Learning Objectives

• Explain the three core statements of cell theory and describe how new cells arise from existing cells.
• Compare unicellular and multicellular organization and connect cell specialization to organism function.
• Differentiate prokaryotic and eukaryotic cells by identifying key structural features and their effects on cellular processes.

Learning Objectives

• Interpret microscopy images using scale bars, resolution limits, staining/contrast, and controls
• Differentiate what electron microscopy and fluorescence microscopy can reveal about cells and organelles
• Evaluate claims about cellular processes by comparing image sets over time while accounting for artifacts

Learning Objectives

• Model how seafloor spreading and subduction zones drive changes in Earth’s surface and seafloor features.
• Explain how volcanic arc systems and mountain belt uplift result from crustal deformation and faulting.
• Use evidence such as seafloor magnetic anomaly patterns and geologic cross-sections to support plate tectonics.

Learning Objectives

• Explain how hazard risk is evaluated using occurrence, frequency, and consequences for earthquakes, volcanoes, tsunamis, hurricanes, and floods.
• Use ideas from probabilistic models and historical records to interpret return-period information and its limits.
• Describe how exposure, vulnerability, and cascading system effects influence community and infrastructure susceptibility.+ Show more

Learning Objectives

• Use Punnett squares to predict genotype and phenotype ratios in single-gene crosses involving dominant and recessive alleles.
• Interpret probability outcomes in monohybrid and dihybrid inheritance, including how independent assortment affects ratios.
• Compare simple Mendelian expectations with real inheritance patterns (incomplete dominance, codominance, and linked loci).

Learning Objectives

• Explain how genetic technologies can create ecological, economic, and health risks and benefits.
• Describe the idea of risk assessment, including uncertainty and long-term monitoring.
• Evaluate trade-offs using Alberta-relevant examples such as canola introgression and cattle genetics.

Learning Objectives

• Explain how atomic number and mass number determine the identity and isotopes of elements
• Describe the roles of protons, neutrons, and electrons in atomic structure
• Use simple nucleus and electron-shell models to predict basic chemical behaviour+ Show more

Learning Objectives

• Represent forces as vectors with both magnitude and direction
• Resolve a force into orthogonal components and interpret what the components mean physically
• Determine the resultant (net force) using graphical and analytical vector addition+ Show more

Learning Objectives

• Explain how work relates to energy transferred by a force acting through a distance.
• Predict whether an object’s kinetic energy increases or decreases based on the net force direction relative to motion.
• Use the idea of net force doing work to interpret speed changes in real situations.

Learning Objectives

• Construct a scientific argument using a claim-evidence-reasoning (CER) structure with clear logical links.
• Evaluate scientific arguments by checking coherence, relevance, and how well evidence supports claims.
• Use quantitative evidence, model comparisons, and uncertainty/limitations to judge argument strength.+ Show more

Learning Objectives

• Explain how metric units and prefixes create precise, consistent measurements in science
• Determine instrument resolution and convert readings correctly using appropriate significant figures
• Describe why calibration reduces systematic error and improves data reliability+ Show more

Learning Objectives

• Explain how glycolysis, the TCA cycle, and electron transport drive cellular respiration and ATP production.
• Compare aerobic and anaerobic outcomes using ATP yields and redox (NADH/FADH2) considerations.
• Use stoichiometry and pathway flux ideas to predict how substrate availability and enzyme regulation change cellular energy currency.

Learning Objectives

• Explain how orogenic processes (crustal shortening, thickening, metamorphism, and isostatic adjustment) build mountain belts.
• Use ideas from structural cross sections, uplift rate estimates, and thermochronology to link plate convergence to surface topography.
• Describe how mountain building influences erosion, river incision, sediment delivery, and regional climate over long timescales.

Learning Objectives

• Interpret position–time graphs to determine velocity from the slope and direction from the sign of the slope
• Interpret velocity–time graphs to determine acceleration from the slope and displacement from the area under the graph
• Relate piecewise motion graphs to algebraic kinematics and to the idea of net force causing acceleration under Newton’s laws

Learning Objectives

• Differentiate divergent, convergent, and transform plate boundaries based on plate motion and typical landforms.
• Explain how each boundary type relates to earthquakes, volcanism, and crustal deformation.
• Use spatial patterns of trenches, ridges, arcs, and fault zones to infer boundary processes over geologic time.

Learning Objectives

• Explain how Earth’s axial tilt and revolution around the Sun produce seasonal patterns in sunlight.
• Describe how the Moon’s synodic cycle leads to repeating lunar phases.
• Interpret how gravitational interactions between Earth, the Moon, and the Sun drive tides.+ Show more

Learning Objectives

• Explain how energy profiles show activation energy (Ea), transition states, and enthalpy change (ΔH) for chemical reactions.
• Differentiate exothermic and endothermic reactions using the sign of ΔH and the relative energy levels of reactants and products.
• Interpret reaction-coordinate graphs to infer energy flow and predict how changing Ea affects reaction speed.

Learning Objectives

• Explain how conservation of atoms connects to conservation of mass when system boundaries are defined correctly.
• Distinguish between open and closed systems and predict how escaped gases affect measured mass.
• Use mass measurements (reactants and products) to evaluate whether accounting for all phases is complete.+ Show more

Learning Objectives

• Explain how membrane-bound organelles compartmentalize cellular activities in eukaryotic cells.
• Match specific organelles to their primary functions (energy production, protein synthesis, processing, sorting, and waste breakdown).
• Describe how functional specialization improves efficiency and coordination of metabolic pathways.

Learning Objectives

• Explain why circular motion requires a centripetal net force directed toward the center.
• Use the relationship between centripetal acceleration, speed, and radius to predict how motion changes.
• Identify and analyze the forces (tension, friction, normal force) that provide the inward centripetal force.

Learning Objectives

• Interpret acceleration using speed–time and distance–time data during measured intervals.
• Determine whether acceleration is approximately constant or changing from the shape of a data curve or the pattern of slopes.
• Explain how acceleration direction relates to the direction of speed change.

Learning Objectives

• Explain how DNA, RNA, and protein sequence similarities can indicate common ancestry.
• Use ideas from molecular clocks to describe how divergence times can be estimated from sequence divergence.
• Interpret how conserved genes, gene duplications, and shared regulatory changes support evolutionary relationships.

Learning Objectives

• Explain how competition, predation, herbivory, parasitism, and mutualism shape community structure.
• Describe how keystone species and ecosystem engineers can disproportionately affect ecosystem processes.
• Use interaction examples to distinguish direct effects from indirect effects in communities.+ Show more

Learning Objectives

• Explain how DNA replication produces two DNA molecules using a semi-conservative mechanism.
• Describe the roles of helicase, primase, DNA polymerase, and Okazaki fragments during replication.
• Compare leading-strand and lagging-strand synthesis and predict how errors can affect genome stability.+ Show more

Learning Objectives

• Explain how epithelial, connective, muscle, and nervous tissues are organized at the microscopic level.
• Relate tissue structure (cell shape, junctions, extracellular matrix, and membrane features) to tissue function in organs.
• Use examples to predict how differences in tissue structure affect protection, transport, movement, and signaling.