CBSE Grade 7 Science Exam Survival Guide

Window: Annual Exam | Units: Physics, Chemistry, Biology

Must-do topics (with how-to + examples)

• Nutrition (Plants & Animals) → Photosynthesis equation; human digestive system parts.
  Ex: Write → mouth–oesophagus–stomach–intestine–anus.
• Respiration → Aerobic vs anaerobic; equation for glucose breakdown.
• Transportation → Circulatory system: heart chambers, blood vessels; transport in plants: xylem, phloem.
• Reproduction (Plants) → Asexual (budding, spore, veg. propagation); Sexual (flower parts).
• Acids, Bases, Salts → Indicators (litmus, turmeric); neutralisation in daily life.
• Physical & Chemical Changes → Melting/freezing vs rusting/burning.
• Heat → Conductors, insulators; thermometer readings.
• Light → Reflection, plane mirror, periscope, kaleidoscope.
• Electric Current → Circuit symbols, series/parallel difference.
• Weather/Climate → Climate factors, adaptations in polar vs tropical animals.

Top traps (avoid)

• Forgetting to add equations (e.g., photosynthesis, respiration).
• Leaving diagrams unlabeled.
• Writing “change” without reversible/irreversible reason.
• Confusing series vs parallel.

Time split

• Bio 35% | Chem 35% | Physics 30%
• Do diagrams & numericals early, definitions after.

Last-48h checklist

• Redraw & label 8 diagrams (heart, digestive, flower, periscope, circuit, thermometer, stomata, water cycle).
• 20 flashcards: acid-base uses, plant parts, climate adaptations.
• 1 mini-mock (2h) → revise only mistakes.

Quick facts / formulas

• Photosynthesis: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ (in presence of sunlight & chlorophyll).
• Respiration: C₆H₁₂O₆ + O₂ → CO₂ + H₂O + Energy (ATP).
• Heat: ΔT = Tfinal − Tinitial; thermometer units °C.
• Circuit: Current flows + to − in diagrams; actual electron flow − to +.

Speed tactics

• Define → explain → example.
• Use arrows in diagrams to show flow (blood, food, current).
• Box final numerical with unit.

Exam-day mini-plan

• Start with diagrams (heart, digestive, circuits).
• Then physics numericals, chem Qs, bio processes.
• End with short definitions.
• Last 10 min: diagram label + unit check.