PLS FOUNDATION
Ask testable questions and distinguish an observation from an explanation.
3 GUIDES · ENGLISH & HINDI
Start with a level that fits what you already know. Each guide includes explanations, practice and answers. About learning levels →
Science & evidence
BeginnerWhy does a fair test matter? Learn how variables, repeated measurements and alternative explanations turn a sensible guess into a conclusion you can defend.
Learning outcome: You will turn a broad curiosity into a testable question, plan a fair comparison, and distinguish a result from the explanation offered for it.
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BeginnerFollow a walk, a trolley and a lifted schoolbag to understand distance, velocity, force, work and energy.
Learning outcome: Calculate distance, displacement, speed, net force and simple work; explain balanced forces and energy transfers.
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BeginnerA pond or garden works through connections between organisms, water, air and soil.
Learning outcome: Explain a food web, distinguish energy flow from nutrient cycling and predict possible effects of a habitat change.
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