Grade 9 Science Worksheets

Learning Objectives

• Define physical change and identify examples
• Differentiate between physical and chemical changes
• Describe common physical processes in everyday life

Learning Objectives

• Explain how Earth’s rotation produces apparent diurnal motion of celestial objects across the sky.
• Describe how Earth’s revolution around the Sun leads to apparent annual changes in which stars are visible at night.
• Use celestial coordinate ideas (altitude and azimuth) to reason about rising and setting from an Earth observer’s viewpoint.+ Show more

Learning Objectives

• Describe the particle model of matter using particle motion, spacing, and forces
• Explain how temperature relates to particle kinetic energy and particle motion
• Compare particle arrangements in solids, liquids, and gases and predict macroscopic behaviors+ Show more

Learning Objectives

• Understand how water moves through evaporation, condensation, and precipitation
• Describe the processes linking the atmosphere, surface, and groundwater
• Recognize the importance of the water cycle in Earth's systems+ Show more

Learning Objectives

• Explain how homeostatic feedback loops maintain internal stability using sensors, control centers, and effectors.
• Differentiate negative feedback from positive feedback and predict their overall effects on a body variable.
• Describe how signaling pathways and transport processes help transmit information and coordinate responses across tissues.

Learning Objectives

• Explain how the nervous and endocrine systems work together to maintain homeostasis.
• Compare the roles of neural signaling and hormonal signaling in short-term and long-term responses.
• Describe how feedback loops can adjust signaling to keep internal conditions stable.

Learning Objectives

• Explain how cell membranes enable selective transport through diffusion and transport proteins
• Describe how organelles support compartmentalized metabolism and efficient cellular reactions
• Interpret how the cytoskeleton provides structural support and enables internal transport+ Show more

Learning Objectives

• Draw and interpret free-body diagrams by identifying all forces acting on an isolated object
• Apply force-vector conventions (direction, labeled forces, points of application, and coordinate axes)
• Differentiate equilibrium from acceleration using net force and Newton’s second law+ Show more

Learning Objectives

• Explain how grounding, overcurrent protection, and insulation work together to reduce electrical hazards.
• Interpret common device labels and identify what information matters for safe installation.
• Describe how environmental conditions (moisture, temperature, outdoor exposure) affect electrical safety requirements.

Learning Objectives

• Explain how an inclined plane changes gravity into components parallel and perpendicular to the surface.
• Predict how friction and slope angle affect acceleration down an incline.
• Relate mechanical advantage to the tradeoff between force and distance using work ideas.

Learning Objectives

• Understand the hierarchy of biological organization from molecules to organisms.
• Identify key characteristics and functions at each level of organization.
• Explain how emergent properties develop at higher levels from lower levels.+ Show more

Learning Objectives

• Explain how net force (vector sum of forces) relates to acceleration and changes in motion
• Determine whether motion stays constant or speeds up/slows down based on balanced vs. unbalanced forces
• Use force directions and vector ideas to predict the direction of acceleration+ Show more

Learning Objectives

• Define what a free body diagram is and its purpose in physics.
• Identify the forces acting on an object when drawing a free body diagram.
• Understand how to represent forces with vectors in diagrams.+ Show more

Learning Objectives

• Identify inheritance patterns in pedigrees (autosomal dominant, autosomal recessive, X-linked, and mitochondrial).
• Use affected and carrier status, sex distribution, and generation skipping to infer likely genotypes.
• Apply basic probability ideas to estimate recurrence risk for relatives and explain how penetrance can affect interpretation.

Learning Objectives

• Understand the principle of conservation of mass during chemical reactions.
• Identify how gaseous products can affect apparent mass changes.
• Recognize external factors influencing mass measurements.+ Show more

Learning Objectives

• Define and differentiate between resilience and resistance in ecosystems.
• Explain how ecological thresholds influence regime shifts and community functions.
• Identify factors such as feedback loops, variability, and connectivity that affect ecosystem resilience.+ Show more

Learning Objectives

• Understand the difference between elements, compounds, and mixtures
• Identify examples of pure substances and mixtures
• Use chemical symbols and formulas to represent elements and compounds+ Show more

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

• Identify major cell organelles and their functions
• Explain how cell structures contribute to cellular activities
• Recognize the importance of membranes, organelles, and cytoskeleton in cell health

Learning Objectives

• Explain how impulse and the force–time relationship affect peak forces during collisions
• Describe how material deformation and energy dissipation reduce injury risk in real safety designs
• Interpret force–time ideas to compare mitigation strategies such as crumple zones, airbags, and padding

Learning Objectives

• Understand the concepts of kinetic and potential energy
• Recognize conditions for the conservation of mechanical energy
• Identify effects of non-conservative forces such as friction+ Show more

Learning Objectives

• Identify the symbols of common elements.
• Understand how chemical formulas represent compounds.
• Learn the significance of element symbols in scientific communication.+ Show more

Learning Objectives

• Explain how biological organization moves from cells to tissues, organs, and organ systems.
• Describe how interacting organ systems support coordinated body functions.
• Use examples to model system-to-system communication for regulation and homeostasis.

Learning Objectives

• Understand the importance of variables in scientific investigations.
• Identify independent and dependent variables in an experiment.
• Learn how controlling variables enhances the reliability of experimental results.

Learning Objectives

• Explain how gravity provides the inward (centripetal) force that keeps planets and moons in curved orbits
• Describe how orbital paths are repeatable and how orbital period relates to time-based patterns in the sky
• Use qualitative reasoning to connect an object’s distance from a massive body to its orbital motion

Learning Objectives

• Explain the overall purpose of glycolysis and its main products.
• Describe the stepwise energy changes during glycolysis, including ATP investment and ATP payoff.
• Compare what happens to pyruvate under aerobic versus anaerobic conditions.+ Show more

Learning Objectives

• Understand the formation and movement of magma within Earth's crust.
• Identify different eruptive styles and their controlling factors.
• Analyze volcanic gas emissions and their impact on climate and environment.+ Show more

Learning Objectives

• Explain the role of the hypothalamus in neuroendocrine regulation.
• Identify key anatomical features that support hormone regulation and signaling.
• Describe how the hypothalamus and pituitary glands coordinate to regulate overall body functions.+ Show more

Learning Objectives

• Describe major mechanisms of asexual reproduction, including fission, budding, spore formation, and vegetative propagation
• Explain how producing genetically identical offspring affects variation, spread rate, and resilience
• Connect asexual strategies to real-world examples such as aspen groves, bacterial growth in environments, and horticultural propagation

Learning Objectives

• Differentiate between models, explanations, and theories in science
• Explain how theories are supported by evidence and can change with new data
• Use scientific reasoning to connect observations to mechanisms through explanations

Learning Objectives

• Explain how waves transfer energy (and sometimes information) without transporting matter overall
• Relate frequency, wavelength, and amplitude to observable wave behavior and the energy a wave carries
• Use wave-property relationships to predict how changes in a wave affect its motion and signaling capability

Learning Objectives

• Identify how mutations, chromosomal rearrangements, meiotic recombination, and independent assortment create heritable genetic variation
• Explain how recombination outcomes and insertion/deletion events can change coding sequences and influence phenotypes
• Connect molecular genetic changes to population-level variation and allele frequency shifts

Learning Objectives

• Understand the process of DNA replication and its semi-conservative nature.
• Identify key enzymes involved in DNA replication such as helicase, primase, and DNA polymerase.
• Explain the roles of leading and lagging strand synthesis and the significance of Okazaki fragments.+ Show more

Learning Objectives

• Explain the particle model of matter using particle motion, spacing, and forces to describe solids, liquids, and gases.
• Relate temperature to particle kinetic energy and to diffusion rate and gas behavior.
• Use particle-level reasoning to explain macroscopic observables such as gas pressure and phase stability.

Learning Objectives

• Understand the different types of motion graphs: position–time and velocity–time graphs
• Interpret the slope of position–time graphs as velocity
• Interpret the slope of velocity–time graphs as acceleration+ Show more

Learning Objectives

• Use the heat transfer relationships to calculate thermal energy changes from mass and temperature change
• Explain how conduction, convection, and radiation move thermal energy and how signs indicate direction of energy flow
• Apply conservation of energy ideas to closed-system thermal processes such as heating and phase changes

Learning Objectives

• Explain how systems thinking and decision models support comparing mitigation and adaptation strategies under uncertainty.
• Use scenario analysis and integrated assessment ideas to evaluate trade-offs among greenhouse gas reduction, public health, and economic development.
• Apply cost-benefit reasoning and lifecycle thinking to compare policy instruments (e.g., carbon pricing, land-use planning, and infrastructure investment) across time and space.

Learning Objectives

• Understand how different organ systems communicate through feedback mechanisms
• Identify examples of feedback loops in physiological processes
• Explain the role of redundancy and cross-regulation among body systems+ Show more

Learning Objectives

• Understand how Earth's radiative balance influences climate.
• Identify different energy transfer processes such as conduction, convection, and radiation.
• Analyze how differential heating drives atmospheric circulation and weather variability.+ Show more

Learning Objectives

• Understand how the slope of displacement–time graphs indicates velocity.
• Interpret the area under velocity–time graphs to determine displacement.
• Identify non-uniform acceleration through curved graphs and discontinuities.+ Show more

Learning Objectives

• Explain the conservation of mass principle in closed chemical systems using atomic reasoning
• Use mass measurements and particle conservation ideas to interpret chemical reactions (including gas and combustion scenarios)
• Apply conservation of mass to simple material-balance situations relevant to real-world resource processing

Learning Objectives

• Explain the roles of magnification, resolution, and contrast in microscopy image quality
• Compare how light microscopes and electron microscopes create magnified images
• Use scale bars and preparation/staining information to interpret micrographs accurately

Learning Objectives

• Understand the concept of work as the dot product of force and displacement.
• Learn to calculate work when force and displacement are in the same or different directions.
• Explore the methods for calculating work done by variable forces.+ Show more

Learning Objectives

• Identify key structural differences between prokaryotic and eukaryotic cells
• Describe the functions of various cell components
• Understand how cell structure relates to biological roles and evolution

Learning Objectives

• Explain speciation as the splitting of one ancestral population into distinct species.
• Compare allopatric and sympatric speciation and identify how gene flow changes in each.
• Distinguish prezygotic and postzygotic reproductive barriers and give examples of each.

Learning Objectives

• Explain how major organelles in eukaryotic cells are structured for specific functions.
• Connect membrane folding and compartmentalization to rates of metabolism and efficient exchange.
• Describe how the nucleus, endoplasmic reticulum, Golgi apparatus, mitochondria, ribosomes, and cytoskeleton work together.

Learning Objectives

• Explain how computational models use assumptions, variables, and parameters to predict system behavior.
• Use algebraic performance objective functions to compare design scenarios and justify parameter choices.
• Describe and interpret results from sensitivity analysis to understand how outputs change with inputs.

Learning Objectives

• Understand the concepts of power and efficiency in mechanical systems
• Calculate power output in various engineering contexts
• Identify factors affecting the efficiency of machines+ Show more