Grade 9 Science Worksheets

Learning Objectives

• Explain how sex chromosomes (X and Y) influence inheritance patterns.
• Distinguish X-linked recessive inheritance from autosomal inheritance in terms of risk to males and females.
• Describe dosage compensation and hemizygosity and how these mechanisms affect gene expression.+ 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

• Differentiate heterogeneous mixtures from homogeneous solutions using the idea of uniformity.
• Identify solute, solvent, and concentration in common examples such as saline lake water.
• Explain how physical properties can be used to separate components without chemical change.+ Show more

Learning Objectives

• Identify and label all external forces acting on an isolated object in a free body diagram.
• Determine the direction of each force vector and distinguish forces that cancel from forces that produce net force.
• Use net force and Newton’s second law concepts to predict acceleration and motion outcomes.

Learning Objectives

• Identify different prototyping methods used in scientific applications.
• Understand the purposes and appropriate selection of prototyping fidelity levels.
• Recognize materials suitable for various prototype types.+ Show more

Learning Objectives

• Understand different mechanisms of energy transfer, including work, thermal transfer, and radiation.
• Identify observable effects of energy transfer such as temperature change and motion.
• Differentiate between stored energy and transferred energy in various processes.+ Show more

Learning Objectives

• Explain how conservation of atoms and conservation of mass apply to chemical reactions.
• Use word descriptions to predict particle-level changes and possible product amounts.
• Interpret balanced chemical equations as evidence that atoms are neither created nor destroyed.+ Show more

Learning Objectives

• Define evolution in terms of changes in heritable traits and allele frequencies over generations
• Explain how natural selection and genetic drift affect allele frequencies
• Describe how mutation and gene flow introduce variation and transfer alleles between populations+ Show more

Learning Objectives

• Explain how net force determines the direction and magnitude of an object's acceleration
• Apply Newton’s second law ideas to predict how changes in net force and mass affect acceleration
• Use real-world examples (like a pushed cart) to describe combined effects of multiple forces+ Show more

Learning Objectives

• Explain how organelle form and abundance relate to specialized cellular functions.
• Compare structures such as smooth endoplasmic reticulum, mitochondria, vacuoles, and cilia/flagella across cell types and taxa.
• Use the structure–function relationship to make predictions from cellular diagrams or descriptions.

Learning Objectives

• Explain how energy transfer during phase changes affects particle motion and potential energy.
• Describe heating and cooling processes using temperature plateaus and qualitative heating curves.
• Distinguish melting, vaporization, sublimation, and condensation in terms of latent heat and energy flow.

Learning Objectives

• Differentiate physical and chemical properties and changes based on whether new substances form
• Use evidence such as color change, gas production, temperature change, and product formation to classify a change as physical or chemical
• Connect observed behaviors to particle-level explanations using the idea of bonding and identity of matter

Learning Objectives

• Explain how collision frequency, activation energy, and reaction pathways influence reaction rate
• Use temperature, concentration, and catalysts to predict changes in reaction rate
• Apply reaction order and rate laws to relate measurable rate to reactant concentration

Learning Objectives

• Model ionic, covalent, and metallic bonding using electron transfer or electron sharing ideas
• Explain how polarity and bond energy relate to the stability of substances
• Connect bonding type to macroscopic properties such as melting point, conductivity, and solubility

Learning Objectives

• Describe the semi-conservative nature of DNA replication.
• Identify roles of key enzymes involved in DNA duplication.
• Explain the significance of replication fidelity and timing for genome stability.+ Show more

Learning Objectives

• Explain how impulse relates to momentum change in collisions using force and contact time
• Interpret force–time profiles to predict how contact duration affects the resulting motion
• Distinguish elastic and inelastic collisions using kinetic energy and energy transformations+ Show more

Learning Objectives

• Explain how computational simulations generate predictions from hypothesized mechanisms
• Describe how parameter sensitivity and scenario comparisons help evaluate model behavior
• Use ensembles and visualizations to represent uncertainty in forecasts+ Show more

Learning Objectives

• Understand how feedback loops, redundancy, and cross-regulation contribute to system coordination in the body.
• Identify examples of multi-system responses during exercise and how they maintain homeostasis.
• Explain how disruptions in one component can cascade and affect overall organism health.+ Show more

Learning Objectives

• Understand how changes in wave parameters affect wave signals.
• Relate wave frequency, wavelength, and amplitude to wave energy and patterns.
• Translate between different wave representations based on wave parameters.+ Show more

Learning Objectives

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

Learning Objectives

• Explain how climate variability is identified by comparing multiple weather-related measurements over long time periods.
• Differentiate variability from persistent climate change using evidence from temperature, precipitation, and wind or humidity records.
• Use examples such as El Niño–related ocean-atmosphere shifts to describe how boundary-condition changes alter regional weather statistics.

Learning Objectives

• Understand the basic concepts of particles in different states of matter.
• Explain how particle motion and arrangement determine the properties of solids, liquids, and gases.
• Relate particle energy to temperature and kinetic energy.+ Show more

Learning Objectives

• Explain how molecular changes can lead to organ-level dysfunction
• Construct multilevel explanations linking genetic variation to physiology
• Interpret biochemical, histological, and organ function evidence+ Show more

Learning Objectives

• Calculate acceleration from net force and mass for constant-mass systems
• Determine net force by adding multiple forces as vectors
• Interpret free-body diagrams showing contact and gravitational forces+ Show more

Learning Objectives

• Explain how solar energy, albedo, and radiation determine Earth’s energy balance
• Describe how greenhouse gases influence surface-atmosphere temperature patterns
• Explain how ocean heat transport creates regional climate differences+ Show more

Learning Objectives

• Explain how negative feedback maintains internal conditions within narrow limits
• Describe how positive feedback can amplify change in biological processes
• Identify the roles of sensors and effectors in feedback loops+ Show more

Learning Objectives

• Identify functional requirements in a potable water delivery challenge
• Distinguish social, economic, environmental, and regulatory constraints
• Prioritize stakeholder criteria as measurable evaluation factors+ Show more

Learning Objectives

• Explain how geologic and atmospheric indicators reveal hazard origins
• Describe how triggering mechanisms initiate natural hazards
• Interpret recurrence intervals to support hazard risk assessments+ Show more

Learning Objectives

• Model how tectonic forces shape the lithosphere through plate processes
• Interpret magnetic anomaly patterns as evidence of seafloor spreading
• Explain how mantle convection relates to crustal deformation and faulting+ Show more

Learning Objectives

• Describe transformations among igneous, sedimentary, and metamorphic rocks
• Identify melting, crystallization, erosion, compaction, and metamorphism processes
• Explain how temperature and pressure influence mineral changes during metamorphism+ Show more

Learning Objectives

• Identify amplitude, frequency, wavelength, and phase in wave descriptions
• Calculate wave speed using frequency and wavelength
• Explain how phase affects constructive and destructive interference+ Show more

Learning Objectives

• Describe how electric and magnetic fields affect moving charges
• Use vector superposition to predict net field direction
• Predict charged-particle curvature in a uniform magnetic field+ Show more

Learning Objectives

• Explain how temperature, pressure, and concentration affect reaction rates
• Explain how catalysts affect reaction pathways and reaction rates
• Predict how changing conditions can shift product distribution at equilibrium+ Show more

Learning Objectives

• Formulate an objective function using design variables and assumptions
• Compare predicted outcomes from multiple computational scenarios
• Explain how parameter changes affect model outputs+ Show more

Learning Objectives

• Explain how nucleic acid sequences determine amino acid chains
• Describe how protein folding creates specific three-dimensional structures
• Connect protein structure to specific cellular functions+ Show more

Learning Objectives

• Explain how glycolysis converts glucose energy into ATP and NADH
• Describe how electron transport creates a proton gradient
• Explain how ATP synthase uses the gradient to produce ATP+ Show more

Learning Objectives

• Compare prototype types by purpose and fidelity
• Select suitable prototype materials and testing protocols
• Interpret prototype test data for design refinement+ Show more

Learning Objectives

• Interpret coefficients as mole ratios in balanced chemical equations
• Convert reactant masses between grams and moles using molar mass
• Calculate theoretical product amounts using stoichiometric ratios+ Show more

Learning Objectives

• Identify seismic-wave evidence for Earth's internal layers
• Explain how gravity data support density-based interior models
• Interpret heat-flow measurements as evidence of internal energy transfer+ Show more

Learning Objectives

• Explain how discharge and sediment load shape Earth’s surface
• Describe how runoff changes river channel morphology
• Connect storm events to long-term watershed landscape evolution+ Show more

Learning Objectives

• Explain how fossil fuel combustion increases atmospheric carbon dioxide
• Explain how deforestation affects atmospheric carbon dioxide levels
• Interpret evidence from CO2 records, temperature trends, and satellite observations+ Show more

Learning Objectives

• Explain how scenario analysis compares strategies under uncertain conditions
• Compare economic, environmental, and social outcomes in integrated assessment
• Evaluate climate strategies using cost-benefit reasoning+ Show more

Learning Objectives

• Explain energy conservation using isolated, closed, and open system boundaries
• Identify energy reservoirs in mechanical and electrical systems
• Trace energy transfers using energy flow diagrams+ Show more

Learning Objectives

• Explain how accretion builds planetesimals within a rotating disk
• Describe how differentiation separates materials within growing planetary bodies
• Interpret meteorite composition as evidence of early solar system conditions+ Show more

Learning Objectives

• Explain the role of simple computational simulations and numerical models in forecasting.
• Describe how ensembles and visualizations represent forecast uncertainty.
• Understand how discrepancies between simulated and observed data inform model refinement.+ Show more

Learning Objectives

• Describe how an electric motor converts electrical energy into mechanical work
• Explain how a generator produces electrical energy using electromagnetic induction
• Compare motor and generator functions based on energy flow in a simple system+ Show more

Learning Objectives

• Describe the key pathways of cellular energy metabolism, including glycolysis, the citric acid cycle, and oxidative phosphorylation.
• Explain how mitochondrial structure supports ATP production.
• Contrast aerobic and anaerobic energy pathways and their tissue-specific relevance.+ Show more

Learning Objectives

• Explain how Earth’s rotation and orbit produce observable cycles such as day–night and seasonal changes.
• Differentiate sidereal periods from solar periods and describe how this affects what we observe from Earth.
• Use basic orbital geometry and apparent motion concepts to interpret patterns in the night sky.+ Show more