Grade 9 Science Worksheets

Learning Objectives

• Explain how disturbances can change ecosystem stability by altering species interactions and environmental conditions.
• Describe resilience and recovery rate, including the role of feedback processes in ecosystem response.
• Use long-term evidence (population trends and community structure) to distinguish gradual shifts from rapid transitions.

Learning Objectives

• Understand the sequence and causes of lunar phases
• Identify different types of solar and lunar eclipses
• Describe the conditions necessary for eclipses to occur+ Show more

Learning Objectives

• Explain how protons, neutrons, and electrons define atomic number and mass number
• Describe how isotopes of an element differ and why they still count as the same element
• Use simple nuclear and electron-shell models to predict basic chemical behaviour+ Show more

Learning Objectives

• Explain how feedback mechanisms help maintain homeostasis in the human body.
• Describe how circulation, respiration, kidneys, and the nervous system interact to support survival.
• Use examples of thermoregulation, acid–base balance, and stress responses to predict system crosstalk.

Learning Objectives

• Explain how predator-prey, competition, and mutualism connect species in an ecosystem network.
• Describe how abiotic factors like temperature and nutrient availability can change survival and population size.
• Use interaction networks to predict how changes in one population can cascade through a community.

Learning Objectives

• Explain how gravity provides the centripetal force that keeps planets and moons in curved orbits
• Describe how orbital speed and orbital period relate to distance from the central body
• Use the idea of periodic motion to interpret predictable patterns in the night sky

Learning Objectives

• Understand the concept of adaptive radiation and its ecological significance.
• Identify key processes that drive diversification in species.
• Explain how ecological factors influence morphological and behavioral differentiation.+ Show more

Learning Objectives

• Explain how mechanical energy can change between kinetic and potential forms when forces do work.
• Use energy conservation and energy bookkeeping to predict feasible speeds and heights when losses are small.
• Identify how non-conservative forces (like friction and air resistance) dissipate mechanical energy.

Learning Objectives

• Calculate work using the dot-product idea: W = F d cos(θ) for constant force and displacement
• Differentiate work done by constant forces versus variable forces
• Approximate work for variable forces using areas under a force–distance graph+ Show more

Learning Objectives

• Explain the main biological processes involved in nutrient cycling.
• Identify how physical and human activities influence nutrient movement in ecosystems.
• Describe the impact of excess nutrients on aquatic systems and biodiversity.+ Show more

Learning Objectives

• Understand Earth's rotation and how it causes day and night
• Identify the observable effects of Earth's rotation from a terrestrial perspective
• Distinguish between solar and sidereal days+ Show more

Learning Objectives

• Understand the relationship between wave speed, frequency, and wavelength.
• Identify how changes in frequency affect wavelength in a given medium.
• Apply the wave speed formula to different scenarios involving waves.

Learning Objectives

• Understand basic metric units and their importance in scientific measurement.
• Learn about instrument resolution and how calibration affects measurement accuracy.
• Connect raw measurements to data representation through tables and graphs.+ Show more

Learning Objectives

• Explain how mechanical and chemical digestion prepare nutrients for absorption
• Describe how villi and microvilli increase intestinal surface area
• Compare transport routes for sugars, amino acids, and lipids+ Show more

Learning Objectives

• Explain how the Calvin cycle uses ATP and NADPH to fix carbon dioxide into organic molecules.
• Describe the main phases of the Calvin cycle: carbon fixation, reduction, and RuBP regeneration.
• Connect specific enzymes and intermediates (like RuBisCO and 3-carbon intermediates) to each phase.

Learning Objectives

• Understand the key functions of cell membranes and their role in regulating transport.
• Describe how cellular energy powers chemical reactions vital for cell survival and growth.
• Connect cell structure to function through models of internal balance, growth, and environmental response.+ Show more

Learning Objectives

• Understand how wave speed relates to frequency and wavelength.
• Explain the inverse relationship between frequency and wavelength in wave behavior.
• Apply the wave speed formula to different scenarios involving waves in various media.+ Show more

Learning Objectives

• Identify sources of solar energy that enter Earth's atmosphere.
• Describe pathways through which solar radiation and geothermal energy are transferred within Earth systems.
• Understand how energy gradients drive atmospheric and oceanic circulation.+ Show more

Learning Objectives

• Understand how to interpret family trees and pedigree charts to analyze inheritance patterns.
• Identify characteristics of autosomal dominant, autosomal recessive, X-linked, and mitochondrial inheritance modes.
• Apply principles of pedigree analysis to determine inheritance modes and predict genotypes.+ Show more

Learning Objectives

• Understand how the heart and lungs work together to supply oxygen and remove carbon dioxide
• Identify the roles of pulmonary ventilation and cardiovascular transport in gas exchange
• Explain how the body adjusts heart rate, stroke volume, and vascular resistance in response to respiratory needs+ Show more

Learning Objectives

• Identify the different parts of the human heart and understand their functions.
• Explain how the structure of the heart supports its role in circulatory health.
• Recognize the importance of organ organization for physiological processes.

Learning Objectives

• Interpret circuit diagram symbols and connection types to determine circuit topology and possible current paths
• Identify reference nodes and explain how node relationships support voltage measurements
• Use standardized notation to translate between physical components and schematic representations+ Show more

Learning Objectives

• Explain the processes involved in the hydrologic cycle, including evaporation, condensation, precipitation, infiltration, runoff, and groundwater flow.
• Describe how watershed characteristics, porosity, and permeability influence water movement and storage.
• Analyze human modifications such as engineered and land-use changes that affect water timing and distribution.+ Show more

Learning Objectives

• Understand the hierarchical levels of biological organization from molecules to entire organisms.
• Recognize emergent properties at each level of biological complexity.
• Explain how components at lower levels assemble into larger structures that sustain life.+ Show more

Learning Objectives

• Explain how feedback loops, redundancy, and cross-regulation help maintain homeostasis in complex body systems.
• Describe how neural, hormonal, and local signals coordinate respiratory, cardiovascular, and metabolic responses during exercise.
• Analyze how a disruption in one component can cascade to affect whole-organism outcomes.

Learning Objectives

• Explain how changing magnetic flux induces an electromotive force in conductors.
• Describe the relationship between flux change and induced voltage direction and frequency.
• Connect principles of electromagnetic induction to real-world technologies like transformers and generators.+ Show more

Learning Objectives

• Understand Mendelian inheritance and the basic principles of how traits are passed from parents to offspring.
• Identify and distinguish between different inheritance patterns including non-Mendelian variations.
• Analyze how environmental factors and gene linkage influence phenotypic expression.+ Show more

Learning Objectives

• Understand common symptoms indicating electrical faults.
• Recognize the topologies of electrical circuits affected by faults.
• Apply logical reasoning to diagnose open circuits, short circuits, and component degradation.+ Show more

Learning Objectives

• Understand the standard symbols used in pedigree charts
• Interpret inheritance patterns from pedigree diagrams
• Identify autosomal, sex-linked, and mitochondrial inheritance+ Show more

Learning Objectives

• Explain how Earth’s axial tilt and orbital eccentricity affect the intensity and distribution of sunlight over yearly cycles
• Describe how the Moon’s synodic cycle leads to predictable lunar phases
• Connect gravitational interactions between Earth, the Sun, and the Moon to tidal patterns+ Show more

Learning Objectives

• Describe different types of species interactions such as competition, predation, and mutualism.
• Explain the roles of keystone species and ecosystem engineers in shaping community structure.
• Analyze how species interactions influence ecosystem stability and energy flow.+ Show more

Learning Objectives

• Understand how collision frequency, activation energy, and pathways influence reaction rates.
• Explain how temperature, concentration, and catalysts affect accessible energy distributions.
• Apply rate laws and reaction order concepts to real-world reactions like bromine-iodide kinetics.+ Show more

Learning Objectives

• Explain how amplitude, wavelength, and frequency describe a wave signal.
• Relate changes in wave parameters to how the wave appears in different representations.
• Use parameter relationships to interpret or compare signals produced by the same source.

Learning Objectives

• Explain how genes on DNA can determine protein structure and function
• Describe how transcription and translation work at a high level
• Analyze how gene regulation (including promoter function) can change phenotype+ Show more

Learning Objectives

• Explain how new oceanic crust forms at mid-ocean ridges and how older crust moves away over time.
• Interpret magnetic striping patterns as evidence for seafloor spreading and geomagnetic reversals.
• Use seafloor age, bathymetry, and sediment thickness to describe evidence for plate-motion models.

Learning Objectives

• Understand quantitative methods for assessing the fit between models and data.
• Interpret residual plots and goodness-of-fit measures to evaluate model accuracy.
• Identify patterns indicating systematic divergence or heteroscedasticity.+ Show more

Learning Objectives

• Compare prokaryotic (bacteria and archaea) cell structures with eukaryotic cell structures.
• Explain how differences in compartmentalization and genetic arrangement affect cell organization.
• Identify key features such as nucleoid, nucleus, organelles, and chromosome type.

Learning Objectives

• Understand the law of conservation of mass through balancing chemical equations.
• Identify and balance chemical equations to ensure equal atoms of each element on both sides.
• Link formula notation to measurable mass relationships in chemical reactions.+ Show more

Learning Objectives

• Explain why DNA replication is semi-conservative and produces two DNA molecules with one original strand each.
• Describe the main steps of DNA replication, including initiation, primer formation, and leading vs. lagging strand synthesis.
• Connect replication fidelity and repair mechanisms to mutation rates and genome stability.

Learning Objectives

• Understand the concept of impulse and its relation to force and time
• Differentiate between elastic and inelastic collisions
• Analyze how forces during collisions affect an object's momentum+ Show more

Learning Objectives

• Understand the concept of compound machines and how they combine multiple simple machines.
• Learn to calculate overall mechanical advantage using force and displacement relationships.
• Differentiate between ideal and actual mechanical advantage, considering frictional losses.+ Show more

Learning Objectives

• Explain how a device can be viewed as a system with interacting parts that perform specific roles.
• Map a device system by identifying inputs, outputs, energy transfers, and material flow.
• Use system boundaries to determine what belongs inside a device model and what counts as outside constraints.+ Show more

Learning Objectives

• Identify observable evidence of chemical change, including colour shifts, gas evolution, precipitate formation, temperature change, and irreversibility.
• Use evidence to distinguish chemical changes from physical changes in environmental and industrial contexts.
• Explain how multiple evidence markers together strengthen the conclusion that a new substance formed.

Learning Objectives

• Explain how equilibrium and kinetics influence which products form in a chemical process.
• Use equilibrium constants, rate ideas, and mass balance reasoning to predict and improve product distribution in a closed system.
• Describe how temperature, pressure, concentration, and catalysts can be refined to increase yield and selectivity while limiting side reactions.

Learning Objectives

• Explain how glycolysis, the citric acid cycle, and oxidative phosphorylation work together to produce ATP
• Describe how mitochondrial structure supports proton gradients and ATP synthase activity
• Compare aerobic and anaerobic energy pathways and predict where each pathway is used

Learning Objectives

• Define heat transfer and work transfer in physical and chemical changes.
• Differentiate between heat and work as pathways of energy transfer.
• Identify real-life examples of heat transfer and work.

Learning Objectives

• Explain how kidney osmoregulation maintains blood volume, osmolarity, and electrolyte balance.
• Describe how filtration, selective reabsorption, secretion, and concentration occur across nephron segments.
• Analyze how hormones such as ADH and aldosterone change urine concentration and ion composition.+ Show more

Learning Objectives

• Describe the purpose and key processes of the Calvin cycle in photosynthesis.
• Identify the enzymes and molecules involved in the Calvin cycle.
• Explain how ATP and NADPH are utilized during the cycle to synthesize sugars.+ Show more