Tinker Crate — science & engineering build kits for ages 9–12 — real tools, real experiments, delivered monthly. (Affiliate link)
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Medium
Grow five plant types in both soil and water for five weeks to find out which method produces taller plants.
Medium
Grow Kentucky bluegrass in soils set to five different pH levels and measure which acidity produces the tallest grass.
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Grow radish seeds in three types of water and measure which one produces the tallest and heaviest plants.
Medium
Feed nine tomato seedlings with three different plant food treatments and discover which group grows tallest by the end.
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Wrap sprouting beans in foil and spin them on a record player for five days. The roots grow outward, just as they grow downward in soil.
Medium
Place magnets above and below radish seedlings and measure whether the stems bend toward the magnet as they grow.
Medium
Train Mimosa pudica plants with paired light and temperature cues for six days, then remove one cue to see if the plants learned the association.
Medium
Microwave radish seeds for six different time periods. Then track how many sprout and how long they grow over six days.
Medium
Place seed pots at three different soil temperatures and track which group sprouts first. Heat may speed up germination more than expected.
Medium
Sprout three types of beans and seeds using both jar and cloth methods. Compare which approach produces roots first for each type.
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Science Concepts
Acid RainAlgae GrowthAllelopathyAsexual Reproduction in PlantsCaffeine Effects on PlantsCapillary ActionChlorine ToxicityChlorophyllChromatographyCompanion PlantingControl VariablesCut Flower PreservationDetergent and Surfactant EffectsDrought ResistanceEarthworms and Soil HealthElectrical Stimulation in PlantsFertilizers and Plant NutritionGerminationGravitropismGreenhouse EffectGrowing MediaHydroponicsNitrogen CycleOrganic vs. Inorganic FertilizerOsmosisOxidation and AntioxidantsPhotosynthesisPlant CompetitionPlant Conditioning and BehaviorPlant HormonesPlanting DepthPollination and UV PatternsRadiation Effects on Living OrganismsSalt Tolerance in PlantsSeed Size and VigorSmoke and Fire EcologySoil PathogensSoil pHSound and Plant GrowthStates of MatterStomataSymbiosisTranspirationTropismsVegetative PropagationVitamins and Plant GrowthVoltage and Electric CurrentWater Quality and Plant GrowthWind and Mechanical Stress in Plants