Grade 7 Science Worksheets

Learning Objectives

• Explain how species richness and evenness help describe biodiversity in an ecosystem.
• Interpret common biodiversity indices (including the idea of how diversity changes across habitats).
• Connect habitat heterogeneity and niche diversity to species turnover and community differences.+ Show more

Learning Objectives

• Explain how density differences enable separation methods such as decanting, floatation, and centrifugation.
• Describe how buoyant force, sedimentation rate, and centrifugal acceleration affect particle movement in a fluid.
• Predict which density separation method best fits a given mixture and justify the choice using density and particle size ideas.

Learning Objectives

• Explain how energy transfer and convection drive movement in Earth’s atmosphere.
• Describe how pressure gradients and prevailing winds relate to large-scale circulation cells.
• Connect fronts, jet streams, and greenhouse gases to weather variability and climate indicators.

Learning Objectives

• Explain how mechanical energy transfers between kinetic and potential energy in moving systems such as pendulums and springs.
• Use qualitative energy bookkeeping to describe conservation of mechanical energy in a closed system and energy loss to nonmechanical forms in an open system.
• Interpret motion outcomes (speed, height, and amplitude) as evidence of energy redistribution and inefficiencies.

Learning Objectives

• Explain how adaptation traits (structural, physiological, and behavioural) help organisms survive and reproduce in specific environments.
• Describe examples of adaptation in boreal and prairie habitats, including cold tolerance, drought resistance, seasonal coat changes, and root architecture.
• Connect trait variation to selective pressures and trade-offs in how organisms allocate energy and resources.

Learning Objectives

• Explain how increased temperature changes particle motion and spacing in solids, liquids, and gases.
• Describe thermal expansion and contraction using the particle model.
• Predict how temperature changes can affect the size of materials and pressure in confined gases.

Learning Objectives

• Identify independent, dependent, and controlled variables in fair test designs
• Use operational definitions to describe how variables are measured in an investigation
• Design fair tests that reduce confounding by using controls, replication, and consistent timing or conditions+ Show more

Learning Objectives

• Explain how energy transfers from a higher-energy object or system to a lower-energy one.
• Describe how energy can change form (transform) during an energy transfer.
• Connect energy transfers to observable effects such as temperature change, motion, or light emission.+ Show more

Learning Objectives

• Use quantitative models to describe how allele frequencies change over time under selection and drift.
• Interpret probability-based inheritance and translate trait/frequency information into predictions.
• Use Hardy-Weinberg ideas and simple rate calculations to support scientific explanations.

Learning Objectives

• Explain how friction and air resistance act opposite to the direction of motion
• Compare how surface texture and contact affect the size of resistive forces
• Describe how resistive forces change an object's speed and convert kinetic energy into thermal energy

Learning Objectives

• Compare management strategies (protected areas, habitat corridors, restoration, invasive species control, and sustainable harvest) using evidence-based reasoning.
• Explain how biodiversity supports ecosystem services such as pollination, water purification, and food provisioning.
• Evaluate ecological, economic, and social constraints and predict likely outcomes for species persistence.

Learning Objectives

• Explain how energy moves through trophic levels using producers, consumers, and decomposers.
• Describe how photosynthesis and cellular respiration capture and release energy.
• Interpret energy pyramids and estimate how energy decreases between trophic levels using typical transfer efficiencies.+ Show more

Learning Objectives

• Identify and describe major species interactions (predation, competition, parasitism, mutualism, commensalism) using examples from terrestrial and aquatic ecosystems.
• Explain how direct and indirect effects in food webs can cause cascading changes in community structure.
• Use evidence-based causal reasoning to connect species behavior and resource use (e.g., niche partitioning) to changes in interaction strength.

Learning Objectives

• Interpret position-time graphs by using slope and changes in shape to determine velocity behavior
• Interpret velocity-time graphs by using slope to determine acceleration
• Connect graph features (straight lines vs. curves) with constant vs. changing motion+ Show more

Learning Objectives

• Explain how evidence such as fossils, rock types, and continental shapes supports plate tectonics.
• Identify key seafloor features (mid-ocean ridges, trenches) and relate them to plate motion.
• Use earthquake, volcanic, and magnetic striping patterns to describe how plates move over time.

Learning Objectives

• Explain how vibrating objects create pressure waves in a medium and how those waves move sound.
• Relate frequency to pitch and amplitude to loudness.
• Describe how sound transmission depends on the presence and properties of a medium.

Learning Objectives

• Explain how structural, behavioral, and functional adaptations support specific life processes in organisms.
• Describe trade-offs and how improving one function can reduce performance in another.
• Connect adaptations (form) to their roles in survival, feeding, protection, and reproduction.

Learning Objectives

• Explain how models translate observations into representations that support predictions.
• Differentiate physical, diagrammatic, and computational models and describe how each helps predict outcomes.
• Use model assumptions to justify expected results under new conditions.

Learning Objectives

• Use data and observations to support scientific claims with direct references to evidence.
• Explain why evidence implies a claim by using appropriate relationships and units.
• Evaluate alternative explanations by stating which evidence supports one explanation more strongly.

Learning Objectives

• Explain how energy moves through a food web from producers to higher trophic levels.
• Describe how matter cycles through ecosystems using decomposition.
• Interpret how changes to one species can affect other trophic levels.

Learning Objectives

• Use astronomical units (AU), planetary diameters, and light-years to compare distances in space.
• Interpret scaled diagrams and logarithmic ideas to explain orders of magnitude differences.
• Explain how scale affects what we can observe and how fast objects appear to move.

Learning Objectives

• Explain how the law of superposition and original horizontality help determine relative ages of rock layers.
• Use cross-cutting relationships and intrusive contacts to place events in a likely time order.
• Interpret stratigraphic markers such as fossil assemblages and unconformities to correlate layers.

Learning Objectives

• Use probability to predict expected genotype and phenotype ratios from monohybrid crosses.
• Connect Punnett square outcomes to inheritance probabilities.
• Explain how larger populations better match predicted ratios due to random chance.+ Show more

Learning Objectives

• Explain how predator and prey populations can change over time through feedback loops.
• Use cause-and-effect reasoning to predict what happens when predators increase or decrease.
• Describe how predator-prey dynamics can influence other organisms in a community.

Learning Objectives

• Explain how internal structures (transport, digestion, coordination) help organisms survive and grow.
• Describe how external features (shells, spines, coloration, beak forms) support protection, feeding, and movement.
• Use functional relationships to connect traits to survival, balance, and successful reproduction.

Learning Objectives

• Explain how test data are used to identify mismatches with success criteria.
• Describe how targeted design changes can improve performance while respecting constraints (safety, materials, and cost).
• Write clear cause-and-effect explanations connecting evidence to revised outcomes.

Learning Objectives

• Explain how fair testing keeps all conditions the same except for the intended design variable.
• Select appropriate measurement tools and explain why units and scales matter.
• Record and interpret measurement data so results reflect the design change, not the testing setup.

Learning Objectives

• Describe how exponential and logistic population models differ and what each implies about resource limits and carrying capacity.
• Explain how density-dependent and density-independent factors affect population growth rates over time.
• Use population models to interpret patterns in real ecosystems and make simple predictions.

Learning Objectives

• Explain why surface-area-to-volume ratio limits how large cells can be
• Describe how diffusion and transport depend on exchange surfaces
• Identify adaptations that increase exchange efficiency in cells and organisms+ Show more

Learning Objectives

• Identify abiotic drivers (temperature, light, soil composition, moisture, and pH) and describe how they vary across space.
• Explain how abiotic gradients create microhabitats and influence where organisms can live.
• Connect abiotic regimes to organism tolerance ranges and species occurrence in communities.

Learning Objectives

• Explain how detritivores, fungi, and bacteria break down organic matter and how abiotic factors affect decomposition rates.
• Describe how carbon and nitrogen move and transform during decomposition (including formation of detritus, mineralization, and nutrient uptake).
• Connect decomposition rates to soil fertility and ecosystem productivity in wetlands, forests, and grasslands.

Learning Objectives

• Describe how stratification, oxygen gradients, and light penetration form vertical zones in ponds and lakes.
• Explain how abiotic gradients affect community composition and where species can live within a freshwater system.
• Predict how seasonal thermal turnover changes dissolved oxygen, nutrient mixing, and habitat suitability.+ Show more

Learning Objectives

• Summarize common human impacts on ecosystems, including habitat alteration, pollution, resource extraction, and non-native species.
• Explain consequences of human impacts for species composition, ecosystem functions, and long-term resilience.
• Describe core stewardship principles such as mitigation, habitat protection, restoration priorities, and evidence-based monitoring.

Learning Objectives

• Compare scaled physical models, digital finite-element models (FEM), and laboratory load rigs for evaluating strength, stiffness, and failure modes.
• Explain how instrumentation such as strain gauges and displacement transducers are used to quantify structural response.
• Identify limitations of scaling and describe how prototype test results can guide design revisions and risk assessment.

Learning Objectives

• Compare thermal conductivity across metals, ceramics, polymers, and composites and explain how structure affects heat transfer.
• Describe how free electrons and lattice vibrations contribute to conduction in different materials.
• Predict how factors like density, porosity, and moisture can change a material’s effective thermal conductivity.+ Show more

Learning Objectives

• Explain how insulation reduces heat transfer by limiting conduction, convection, and radiation.
• Compare insulating materials (fibreglass, foam, and reflective foils) based on their thermal resistance and practical thickness.
• Describe how thermal bridging, air leakage, and continuous insulation affect the total heat loss of building envelopes.+ Show more

Learning Objectives

• Explain how bending, shear, axial force, and torsion affect structural members.
• Relate support conditions and load placement to internal force distribution in beams and cantilevers.
• Describe how bending moment and shear force influence deflection and serviceability.+ Show more

Learning Objectives

• Explain how chemical properties describe what happens to substances during chemical changes
• Identify chemical property evidence such as gas production, color change, and precipitate formation
• Relate reactivity with acids/bases, combustion/oxidation, corrosion tendencies, and pH changes to material suitability and separation choices

Learning Objectives

• Define and compare key material properties: density, tensile strength, compressive strength, stiffness (modulus), ductility, toughness, and thermal expansion.
• Explain how material properties influence structural performance and design choices for beams and columns.
• Contrast wood, steel, and reinforced concrete by strength-to-weight ratio, deformation under load, and typical failure modes.

Learning Objectives

• Compare elements and compounds based on atomic composition and chemical formulas.
• Explain how bonding and fixed atom ratios affect properties such as conductivity and melting point.
• Use particle-level reasoning to classify substances and predict separation implications.

Learning Objectives

• Explain how heritable variation and environmental pressures drive natural selection.
• Describe how differential survival and reproduction can shift trait distributions over generations.
• Use real-world examples (antibiotic resistance and island finches) to identify selective pressures and adaptations.

Learning Objectives

• Explain how reproductive isolation and geographic separation can lead to speciation.
• Describe how founder effects, polyploidy, and adaptive radiation increase biodiversity.
• Use biogeographic and time-based patterns to interpret how new species form.

Learning Objectives

• Compare particle, ball-and-stick, and lattice representations of atoms and how they relate to molecular vs extended structures.
• Explain how subatomic particles and atomic number connect to atomic notation and bonding patterns.
• Predict how bonding patterns (covalent vs ionic/extended networks) influence properties such as melting point and electrical behavior.

Learning Objectives

• Interpret symbolic chemical equations and explain what quantitative information they can (and cannot) provide about matter interactions.
• Read and compare graphs of mass or temperature versus time to determine trends such as reaction rate or energy change.
• Use tabulated experimental data and stoichiometric relationships to make quantitative comparisons.+ Show more

Learning Objectives

• Explain how heat transfers from warmer regions to cooler regions using conduction, convection, and radiation models.
• Use a simple heat-transfer model to predict the direction of energy flow based on temperature differences.
• Describe how energy can change form while heat moves through a system.

Learning Objectives

• Describe how thermal energy moves through conduction, convection, and radiation using real-world examples.
• Connect temperature changes and observable evidence to the type of heat transfer and the idea of heat flow.
• Compare how quickly different heat transfer modes can move energy in everyday situations.

Learning Objectives

• Explain how exponential and logistic growth models describe population changes over time
• Identify limiting factors (food, predation, disease, and abiotic stress) and predict their effects on populations
• Distinguish density-dependent from density-independent influences on population size+ Show more

Learning Objectives

• Explain how energy moves from producers to consumers through trophic levels
• Use quantitative ideas (energy-transfer efficiency percentages) to predict how much energy reaches higher levels
• Interpret biomass pyramids and describe why energy availability limits population sizes+ Show more