Grade 9 Worksheets

Learning Objectives

• Explain how glycolysis and the citric acid cycle generate ATP precursors and electron carriers (NADH, FADH2).
• Describe how mitochondrial structure (inner membrane folds and matrix enzymes) supports proton gradient formation and ATP synthase activity.
• Compare aerobic and anaerobic pathways, including why ATP yield differs in different tissues (e.g., skeletal muscle during exertion).+ Show more

Learning Objectives

• Understand the basic structure of DNA and how it forms the double helix
• Identify the organization of chromosomes within the cell nucleus
• Explain how DNA is packaged into chromosomes and how this relates to heredity+ Show more

Learning Objectives

• Use balanced chemical equations and molar mass to convert between mass, moles, and particle counts.
• Identify the limiting reactant and determine expected product amounts from stoichiometric ratios.
• Apply conservation of mass to check that total reactant mass equals total product mass in ideal conditions.

Learning Objectives

• Understand how collision frequency, activation energy, and reaction pathways influence reaction rate.
• Explain how temperature, concentration, and catalysts modify energy distributions and reaction speeds.
• Describe rate laws and reaction order with quantitative examples such as bromine-iodide kinetics.+ Show more

Learning Objectives

• Explain how storage reservoirs and time scales affect Earth-system changes in carbon and water.
• Describe how exchange rates between reservoirs (atmosphere, oceans, living systems, rocks) influence carbon levels.
• Analyze how energy flow can drive evaporation, winds, temperature, and feedbacks that reinforce or dampen change.

Learning Objectives

• Explain how interval estimates, likelihood statements, and effect sizes communicate quantitative uncertainty in scientific claims.
• Interpret graphs and visualizations that show variability, and connect them to the uncertainty in the underlying data.
• Report numerical results with appropriate limits of extrapolation and clear assumptions.+ Show more

Learning Objectives

• Identify how audience and purpose influence tone and word choice in oral communication.
• Evaluate statements about language adaptation for clarity, respect, and effectiveness.
• Select appropriate vocabulary and formality for different speaking contexts.+ Show more

Learning Objectives

• Explain how greenhouse gas forcing, albedo changes, aerosol effects, and land-use feedbacks influence Earth’s energy balance
• Use basic radiative transfer and energy-budget ideas to describe the climate system’s warming and equilibrium behavior
• Connect human emissions to carbon-cycle perturbations and projected climate responses+ Show more

Learning Objectives

• Explain how new oceanic crust forms at mid-ocean ridges during seafloor spreading.
• Interpret magnetic striping patterns and relate them to magnetic reversals and ridge symmetry.
• Describe how seafloor age and bathymetry help reconstruct ocean basin formation and plate motion.

Learning Objectives

• Explain how energy flows one direction through food chains and why some energy is lost at each trophic level
• Describe how matter cycles through organisms and the environment through processes such as photosynthesis and cellular respiration
• Interpret models and evidence (trophic levels, biomass changes, and atom rearrangement) to compare energy transfer and matter cycling

Learning Objectives

• Differentiate elements, compounds, and mixtures using macroscopic and compositional criteria
• Identify homogeneous versus heterogeneous mixtures based on appearance and uniformity
• Use chemical symbols and formulas to represent elements and compounds

Learning Objectives

• Understand the concept of longer-term climate patterns and their significance.
• Interpret weather-related data such as temperature, precipitation, and wind to identify trends.
• Explain how phenomena like El Niño influence regional weather and climate variability.+ Show more

Learning Objectives

• Use constant-acceleration (kinematics) equations to relate displacement, time, initial velocity, final velocity, and acceleration
• Apply a consistent sign convention and correct SI units when solving motion problems
• Solve real-world applications (braking, skiing, free fall) and interpret results using substitution and algebra

Learning Objectives

• Identify the different types of metabolic pathways including catabolic and anabolic pathways.
• Describe the roles of enzymes and energy transfer in metabolic processes.
• Explain the regulation mechanisms that control pathway activity within cells.

Learning Objectives

• Identify the key components involved in photosynthesis
• Describe the process by which plants convert sunlight into chemical energy
• Recognize the inputs and outputs of photosynthesis+ Show more

Learning Objectives

• Understand the process of fertilization in animals
• Differentiate between internal and external fertilization
• Describe embryonic development stages+ Show more

Learning Objectives

• Explain how organelles work together as integrated systems to support metabolism and cell maintenance.
• Describe how transport vesicles and the cytoskeleton coordinate movement of molecules and organelles within cells.
• Connect spatial organization of organelles to biochemical pathway function and cell responses.

Learning Objectives

• Understand the different mechanisms of molecular movement across cell membranes.
• Distinguish between passive and active transport processes.
• Explain the roles of specific transport proteins such as channels, carriers, and pumps.+ Show more

Learning Objectives

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

Learning Objectives

• Understand what phylogenetic trees depict about evolutionary relationships.
• Identify parts of a phylogenetic tree, including branches, nodes, and clades.
• Differentiate between rooted and unrooted trees.+ Show more

Learning Objectives

• Understand the Law of Conservation of Mass in chemical reactions
• Learn how to balance chemical equations
• Identify elements and formulas in chemical reactions+ Show more

Learning Objectives

• Explain how an iteration loop uses test evidence to improve a design over multiple cycles
• Describe how changing variables (dimensions, materials, alignment, interactions) can affect outcomes
• Justify why reliability and safety margins often grow after repeated testing

Learning Objectives

• Understand the concept of power as the rate of energy transfer.
• Describe the difference between power and energy.
• Explore real-world examples of power in engineering applications.+ Show more

Learning Objectives

• Explain how mechanical energy changes between gravitational potential energy and kinetic energy.
• Use the idea of energy conservation with non-conservative losses (like friction) to predict motion limits.
• Describe energy transfers during work interactions and how dissipation affects achievable speeds and heights.

Learning Objectives

• Define genetic drift and explain its role in evolution.
• Identify the effects of genetic drift in small populations.
• Differentiate between genetic drift and natural selection.+ Show more

Learning Objectives

• Explain how wind and solar variability affects grid operation and dispatch planning.
• Describe how energy storage and grid balancing help maintain reliable electricity supply.
• Evaluate the environmental and economic trade-offs of integrating renewables in a regional grid.

Learning Objectives

• Identify the main idea and key supporting details about biological classification.
• Explain how classification helps scientists communicate about living organisms.

Learning Objectives

• Explain how water cycles through interconnected Earth reservoirs using evaporation, condensation, precipitation, and runoff.
• Describe how carbon moves among the atmosphere, living things, oceans, and rocks through photosynthesis, respiration, and chemical exchange.
• Connect Earth’s energy balance (solar vs. Earth radiation) to weather and temperature changes.

Learning Objectives

• Explain how allele frequencies change under Hardy-Weinberg equilibrium assumptions and when those assumptions break down
• Describe how genetic drift, bottlenecks, and founder effects can reduce genetic diversity in small or isolated populations
• Evaluate how gene flow and natural selection interact with stochastic processes to shape evolutionary trajectories

Learning Objectives

• Understand how to interpret scatterplots and identify patterns
• Recognize outliers and trends in graphical data
• Learn the basics of constructing different types of graphs+ Show more

Learning Objectives

• Explain how simple machines transfer forces to change effort, direction, or displacement
• Compare ideal mechanical advantage with real-world outcomes caused by friction and support geometry
• Apply relationships among input force, load, and displacement to common machine examples

Learning Objectives

• Understand the hierarchical levels of biological organization from cells to systems.
• Describe the functions of different tissues, organs, and systems.
• Explain how cell specialization contributes to organ functions.+ Show more

Learning Objectives

• Identify different types of epithelial tissues
• Understand the functions of epithelial tissues in the body
• Recognize example structures of epithelial tissue in organs+ Show more

Learning Objectives

• Explain the steps of a design cycle and how feedback leads to design improvement.
• Identify requirements and constraints in an engineering problem and connect them to evaluation criteria.
• Use evidence from testing to refine a solution and justify changes in a design.

Learning Objectives

• Differentiate heat transfer from work transfer as two distinct pathways for energy movement.
• Explain how energy changes in a system can be described as coming from or going to surroundings through heat and/or work.
• Apply heat and work ideas to physical and chemical changes using correct scientific reasoning.

Learning Objectives

• Differentiate elements, compounds, and mixtures using macroscopic observations and compositional criteria
• Define pure substances as having fixed composition and mixtures as having variable composition
• Interpret and use symbols and formulas to represent elements and compounds (e.g., O, NaCl)+ Show more

Learning Objectives

• Understand the concepts of primary and secondary succession in ecosystems.
• Identify factors influencing succession dynamics and trajectories.
• Describe how species traits, dispersal, and disturbance regimes affect ecosystem recovery.+ Show more

Learning Objectives

• Explain how data, labeled diagrams, and reasoning work together to communicate design decisions.
• Use evidence from testing to justify redesign changes and address trade-offs.
• Summarize results in a way that compares performance to requirements and acknowledges uncertainty.

Learning Objectives

• Explain how igneous, sedimentary, and metamorphic rocks transform through interconnected rock-cycle processes.
• Identify the energy sources and rates that drive rock-cycle transitions, including melting, crystallization, weathering, erosion, deposition, and metamorphism.
• Describe how plate tectonics influences rock-cycle pathways through uplift, burial, and igneous intrusion.+ Show more

Learning Objectives

• Understand how device systems are composed of interacting parts that serve specific functions.
• Identify and map inputs, outputs, energy transfers, and material flows within device systems.
• Explain the importance of system boundaries and how constraints affect device performance.+ Show more

Learning Objectives

• Explain phase changes using energy transfer (kinetic vs. potential energy) and particle motion.
• Interpret qualitative heating and cooling curves, including temperature plateaus and latent heat.
• Relate specific phase transitions (melting, vaporization, sublimation, condensation) to characteristic temperatures without changing chemical identity.

Learning Objectives

• Understand the concept of evidence chains and their role in scientific reasoning.
• Identify basic components involved in linking observations to scientific claims.
• Recognize the importance of clarity, sufficiency, and consistency in evidence.+ Show more

Learning Objectives

• Understand what constitutes relevant evidence in scientific claims.
• Identify patterns in data that support or weaken claims.
• Evaluate alternative explanations based on evidence.+ Show more

Learning Objectives

• Understand the structure and function of nephrons in renal regulation.
• Explain how hormonal feedback mechanisms control kidney function and blood pressure.
• Identify the roles of key hormones like antidiuretic hormone and the renin-angiotensin-aldosterone system.+ Show more

Learning Objectives

• Explain how an interpretation must be supported by evidence, using reasoning to connect the two.
• Write short reasoning statements that clarify how a detail reveals character motivation, theme, or a shift in meaning.
• Identify patterns in a text (recurring language, tone changes, or repeated details) and describe what those patterns suggest.+ Show more

Learning Objectives

• Explain the relationship between power, energy transfer, and time using real-world examples.
• Calculate or interpret efficiency as the fraction of input energy converted to useful output.
• Identify common sources of energy loss and describe how design choices affect operational performance.

Learning Objectives

• Explain why chemical equations must be balanced to conserve atoms during a reaction.
• Use coefficients and subscripts to determine how many atoms of each element appear on both sides of an equation.
• Apply balancing strategies to write correct balanced chemical equations, including state symbols.

Learning Objectives

• Identify claims, evidence, and reasoning within scientific texts
• Analyze how coherence and relevance strengthen scientific arguments
• Evaluate the role of quantitative evidence and model comparisons+ Show more