Grade 9 Science Worksheets

Learning Objectives

• Analyze how scientific models are used in scientific inquiry
• Evaluate the process by which scientific models are refined and improved
• Understand the role of evidence, measurement, and peer evaluation in science

Learning Objectives

• Understand the factors contributing to air pollution caused by human activities.
• Analyze how different actions impact air quality and ecosystem health.
• Evaluate the tradeoffs involved in reducing air pollution while considering other environmental constraints.+ Show more

Learning Objectives

• Identify different parts of mechanical devices
• Understand how parts interact within a system
• Explain the roles of inputs, outputs, and energy transfers+ Show more

Learning Objectives

• Explain how forces can change motion using push or pull effects
• Differentiate contact forces (like friction and normal force) from non-contact forces (like gravity)
• Describe how force direction and magnitude combine using vector reasoning+ Show more

Learning Objectives

• Use dimensional analysis to check that equations for physical and biological quantities have consistent units.
• Derive relationships between quantities by tracking units and identifying plausible proportionality and rate forms.
• Use unit-checking to find and correct algebraic or modeling errors, and to constrain scaling and density/flux/rate computations.

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

• Identify the major step of glomerular filtration in the nephron.
• Explain how filtration differs from reabsorption and secretion.
• Use vocabulary from renal regulation in accurate statements.

Learning Objectives

• Explain how protons, neutrons, and electrons determine atomic structure and ion formation
• Describe how electron configurations and valence electrons relate to chemical properties and periodic trends
• Use quantized energy levels to connect atomic structure models to spectral behavior and reactivity

Learning Objectives

• Explain the composition and function of various organ tissues.
• Describe how organs and organ systems work together to sustain life.
• Identify examples of organ systems and their key organs.+ Show more

Learning Objectives

• Understand the concept of net force and how it influences acceleration.
• Identify different forces acting on an object in various scenarios.
• Explain how multiple forces combine to produce net force and change an object's motion.

Learning Objectives

• Understand key concepts related to Science
• Apply knowledge through practice questions
• Demonstrate comprehension of the material

Learning Objectives

• Understand and apply the constant-acceleration equations to solve for displacement, velocity, acceleration, and time.
• Interpret the sign conventions and units used in motion equations for accurate problem solving.
• Analyze real-world motion scenarios such as vehicle stopping distances, ski slopes, and falling objects using equations.+ Show more

Learning Objectives

• Identify major eukaryotic organelles and describe their specific functions
• Explain how organelle structure and molecular composition support cellular tasks
• Connect organelle roles to how different tissues carry out specialized activities

Learning Objectives

• Explain how centripetal net force produces acceleration toward the center in circular motion
• Use the relationship between speed, radius, and centripetal acceleration to predict changes in motion
• Identify common inward forces (tension, friction, normal force) that maintain curved trajectories

Learning Objectives

• Explain how soil conservation and irrigation practices affect land and water systems.
• Identify indicators of ecosystem resilience and long-term land productivity under different land-use choices.
• Describe watershed management trade-offs involving food production, biodiversity, and water quality.+ Show more

Learning Objectives

• Explain how matter moves among atmosphere, hydrosphere, lithosphere, and biosphere in biogeochemical cycles.
• Describe the roles of key processes (photosynthesis, decomposition, nitrogen fixation, and weathering) in regulating cycle rates and ecosystem productivity.
• Interpret how changes in reservoir size and flux affect model predictions for carbon, nitrogen, and phosphorus pools.

Learning Objectives

• Identify different types of eclipses and their causes.
• Understand the geometry of eclipse formation.
• Describe the roles of the Sun, Earth, and Moon during eclipses.+ Show more

Learning Objectives

• Explain conservation of energy in isolated systems and distinguish energy transfer between forms.
• Use kinetic and potential energy ideas to predict motion outcomes in mechanical situations.
• Describe how nonconservative forces (like friction) convert mechanical energy into thermal energy.+ Show more

Learning Objectives

• Compare physical and chemical changes using the ideas of energy transfer between a system and its surroundings
• Determine whether a change is endothermic or exothermic based on temperature behavior and direction of energy flow
• Explain how microscopic particle motion/arrangement and bond rearrangement relate to observable temperature changes

Learning Objectives

• Explain how energy transfer occurs across trophic levels and why energy decreases upward in a food chain.
• Describe the structure of food webs and how predators and prey can regulate each other (top-down control).
• Use trophic pyramids, ecological efficiency, and production-to-biomass ratios to quantify energy loss and productivity.

Learning Objectives

• Identify the key components of ecosystems and the roles of different species
• Understand how interactions such as predation, competition, and mutualism influence ecosystems
• Recognize environmental factors that affect population sizes and community structure+ Show more

Learning Objectives

• Understand how solar radiation heats Earth's surface and atmosphere
• Identify key energy transfer processes such as radiative balance, conduction, latent heat, and convection
• Interpret energy flux diagrams and their influence on weather and climate patterns+ Show more

Learning Objectives

• Explain the relationship between wave speed, frequency, and wavelength for waves traveling in the same medium
• Use the equation v = fλ to calculate wavelength or frequency from given values
• Interpret how changes in frequency correspond to compensating changes in wavelength when wave speed stays constant

Learning Objectives

• Explain how extraction of Earth resources can alter landforms, habitats, and erosion patterns
• Analyze how pollution and water withdrawal change the transport of contaminants and affect material cycles
• Evaluate sustainability using criteria such as renewability, cumulative effects, and reclamation trade-offs

Learning Objectives

• Explain how coefficients and chemical formulas represent relative particle amounts in chemical equations.
• Balance chemical equations by matching the number of atoms of each element on both sides.
• Use balanced equations to make particle-to-particle predictions about reactants and products.+ Show more

Learning Objectives

• Explain the law of conservation of mass in closed chemical reactions using the idea of conserved atoms
• Use mass-conservation reasoning to interpret evidence from sealed systems (e.g., combustion and captured gas)
• Apply conservation of mass to simple particle and measurement scenarios

Learning Objectives

• Understand the basic concepts of Earth's orbital variations.
• Learn how Milankovitch cycles influence Earth's climate over long timescales.
• Identify the three main components of Milankovitch cycles: eccentricity, axial tilt, and precession.

Learning Objectives

• Understand the basic principles of scaling laws and proportional reasoning.
• Recognize how similarity and nonlinearity influence scientific models.
• Interpret data across different spatial and temporal scales.+ Show more

Learning Objectives

• Explain how cellular structures relate to their functions using specific examples.
• Describe how organism-level body structures and tissues support tasks such as protection and movement.
• Use models to connect physical properties of a structure to the role it performs.

Learning Objectives

• Explain how crossing over and independent assortment during meiosis create genetic variation in gametes.
• Describe how combining two genetically varied gametes at fertilization can produce offspring with observable differences.
• Use evidence from statements and a scientific passage to identify correct ideas about meiotic variation.

Learning Objectives

• Explain how promoters, enhancers, silencers, transcription factors, and repressor proteins regulate gene transcription
• Describe how epigenetic modifications (DNA methylation and histone acetylation) change chromatin accessibility and gene expression
• Analyze how regulatory networks and feedback loops integrate signals to fine-tune gene expression across cell types and environments

Learning Objectives

• Understand the basic principles of electric and magnetic fields and their vector properties.
• Describe how superposition affects field interactions and forces on charges.
• Explain the motion of charged particles in uniform magnetic fields, including curvature and deflection.+ Show more

Learning Objectives

• Understand symbols and relationships in pedigree charts
• Identify inheritance patterns such as autosomal dominant, recessive, X-linked, and mitochondrial
• Interpret pedigrees to determine affected individuals and carriers+ Show more

Learning Objectives

• Explain what an ecological niche includes, including resources, space, and functional role in an ecosystem.
• Describe how feeding relationships and environmental tolerances affect competition and survival.
• Use niche concepts to predict how changes in environmental conditions can reorganize communities.

Learning Objectives

• Define natural selection and explain its role in evolution.
• Identify key traits that can influence an organism's survival.
• Understand how certain traits become more common over generations.+ Show more

Learning Objectives

• Explain how gravitational force from the Moon creates ocean tides on Earth.
• Describe how the changing Earth-Moon alignment produces predictable tidal cycles.
• Compare the role of solar gravity with lunar gravity in strengthening and weakening tides.+ Show more

Learning Objectives

• Understand the concept of homeostasis and its importance in maintaining internal stability.
• Identify feedback mechanisms, especially negative feedback, that regulate body conditions.
• Describe how systems respond to deviations from set points to preserve organismal health.+ Show more

Learning Objectives

• Explain how phylogenetic trees represent hypothesized evolutionary relationships using common ancestors and branching patterns.
• Differentiate monophyletic, paraphyletic, and polyphyletic groups based on what descendants are included.
• Interpret rooted versus unrooted trees and relate tree structure to direction of descent and relationships.+ Show more

Learning Objectives

• Explain how multiple lines of evidence (fossils, anatomy, and genetics) support the theory of evolution.
• Use homologous structures and genetic similarity to infer shared ancestry.
• Distinguish evidence for gradual change from patterns caused by convergent evolution.

Learning Objectives

• Define the law of conservation of mass
• Explain how mass is conserved during chemical reactions
• Identify balanced chemical equations that demonstrate mass conservation+ Show more

Learning Objectives

• Explain how disturbances can change ecosystem interactions and environmental conditions.
• Describe how feedback processes and recovery rates influence whether an ecosystem returns to its original state.
• Use evidence from population trends and community structure to argue for gradual versus rapid ecosystem shifts.+ Show more

Learning Objectives

• Understand key concepts related to Science
• Apply knowledge through practice questions
• Demonstrate comprehension of the material

Learning Objectives

• Explain how uncertainty differs from error and identify sources of random variation and systematic error in measurement data.
• Use uncertainty and significant figures to report measurements appropriately and compare results using error bounds.
• Interpret statements about scientific agreement and uncertainty when reasoning about experimental results.

Learning Objectives

• Understand how to interpret data related to speed and distance.
• Identify the difference between steady and changing speeds.
• Analyze patterns in distance-time graphs to determine motion characteristics.+ Show more

Learning Objectives

• Explain how disturbances (habitat loss, invasive species, and climate shifts) can change ecosystem interactions and stability
• Describe how feedback processes, recovery rates, and resilience influence whether an ecosystem returns to a prior state
• Use evidence from long-term population trends and community structure to reason about gradual versus rapid ecosystem shifts+ Show more

Learning Objectives

• Explain how magma composition, viscosity, and dissolved volatiles control eruption style and hazard potential.
• Compare effusive shield volcanoes with explosive stratovolcanoes using tectonic setting and depositional products.
• Interpret how volcanic gas emissions and climate impacts connect to long-term atmospheric and biogeochemical changes.

Learning Objectives

• Understand the main functions of the immune system
• Differentiate between innate and adaptive immune responses
• Recognize how immune communication integrates with other body systems+ Show more

Learning Objectives

• Understand the different types of species interactions that shape community structure.
• Identify examples of ecosystem engineers and keystone species.
• Explain how indirect effects influence ecosystem stability.+ Show more