Confirmed pattern: 3 sections, 50 questions, 60 marks, 60 minutes, no negative marking — Logical Reasoning (10×1=10), Science (35×1=35), Achievers (5×3=15). Science mixes ~60% Class 7 topics (below, in full detail) with ~40% Class 6 revision topics (a quick recap list is at the end — revise these from your Class 6 material, since they're recap rather than new learning).
Each of the 17 Class 7 topics below: What it is → 3 worked examples/facts → How to teach it → Practice problems (with answers).
What it is: Plants make their own food (autotrophs) via photosynthesis; some plants get nutrition differently — insectivorous plants trap insects, parasitic plants feed off a host, and symbiotic relationships (like lichen) benefit both partners.
Examples: 1) Pitcher plants trap and digest insects for nitrogen. 2) Cuscuta (a parasitic plant) has no leaves and draws nutrients directly from its host plant. 3) Lichen is algae (makes food) + fungi (absorbs water) living together, both benefiting.
How to teach it: Show pictures of a pitcher plant's trap alongside a normal leaf — contrasting "how do you get food if you can't just photosynthesise enough" makes the special cases memorable.
Practice: (a) Name a plant that traps insects. (b) What are the two organisms in a lichen? (c) Why does Cuscuta have no leaves? Answers: (a) Pitcher plant (b) Algae and fungi (c) It doesn't photosynthesise — it gets food directly from its host plant
What it is: Natural fibres (cotton, wool, silk) come from plants or animals and go through processes — ginning, spinning, weaving/knitting — to become fabric.
Examples: 1) Cotton is picked, then ginned (seeds removed), then spun into yarn. 2) Silk is obtained by unwinding the cocoon of the silkworm. 3) Wool is sheared from sheep, cleaned, then spun.
How to teach it: Bring small real fabric swatches (cotton, wool, silk if possible) and let students feel the texture difference before naming the source — a physical link to the abstract process names.
Practice: (a) What is "ginning"? (b) Where does silk fibre come from? (c) Name the step that twists fibres into yarn. Answers: (a) Removing seeds from picked cotton (b) The silkworm's cocoon (c) Spinning
What it is: Heat transfers via conduction (through solids, touching particles), convection (through liquids/gases, moving particles), and radiation (through empty space, no particles needed).
Examples: 1) A metal spoon in hot soup heats up by conduction. 2) Boiling water circulates by convection currents. 3) The Sun's heat reaches Earth by radiation, since space has no matter to conduct/convect through.
How to teach it: Demonstrate all three side by side: touch a heated metal rod (conduction), watch water with a dye drop swirl when heated (convection), and feel sunlight through a window (radiation) — one lesson, three live examples.
Practice: (a) Which mode of heat transfer needs no matter at all? (b) Why does a sea breeze blow during the day? (c) Which material — wood or iron — conducts heat better? Answers: (a) Radiation (b) Land heats faster than sea; warm air rises and cooler sea air rushes in (c) Iron
What it is: Acids taste sour and turn blue litmus red; bases taste bitter/soapy and turn red litmus blue; salts form when acids and bases neutralise each other.
Examples: 1) Vinegar (acetic acid) turns blue litmus red. 2) Soap (a base) turns red litmus blue. 3) Mixing an acid and base produces a salt plus water (neutralisation).
How to teach it: A simple litmus-paper demonstration with lemon juice (acid) and soap solution (base) makes the colour-change rule stick far better than memorising it as a fact.
Practice: (a) What colour does blue litmus turn in an acid? (b) What colour does red litmus turn in a base? (c) What forms when an acid and base neutralise each other (besides water)? Answers: (a) Red (b) Blue (c) A salt
What it is: A physical change alters form but not composition, and is usually reversible (melting ice). A chemical change creates a new substance and is usually irreversible (rusting, burning).
Examples: 1) Melting wax = physical change (can re-solidify). 2) Rusting of iron = chemical change (new substance, iron oxide, forms). 3) Burning paper into ash = chemical change (irreversible).
How to teach it: For every example, ask "can we get the original substance back easily?" — reversibility is the fastest practical test students can apply themselves.
Practice: (a) Is dissolving sugar in water physical or chemical? (b) Is burning a candle wick physical or chemical? (c) Name one everyday chemical change. Answers: (a) Physical (sugar can be recovered by evaporating water) (b) Chemical (c) Rusting, cooking, burning — any one
What it is: Weather is day-to-day atmospheric conditions; climate is the average weather pattern over many years. Animals adapt physically/behaviourally to survive their climate.
Examples: 1) A polar bear has thick fur and fat for insulation in cold climates. 2) A camel stores fat (not water) in its hump for desert survival. 3) Migratory birds fly to warmer regions in winter to find food and suitable temperatures.
How to teach it: Ask "what problem does this climate create, and how does the adaptation solve it specifically?" — this turns memorised facts (thick fur) into understood cause-effect relationships.
Practice: (a) What's the difference between weather and climate? (b) What does a camel's hump store? (c) Why do birds migrate in winter? Answers: (a) Weather = short-term/daily; climate = long-term average pattern (b) Fat (c) To find warmer temperatures and available food
What it is: Wind is air moving from high to low pressure. Storms/cyclones form from rapidly rotating, low-pressure air systems with a calm center called the "eye."
Examples: 1) An anemometer measures wind speed. 2) The "eye" of a cyclone is calm, surrounded by the most violent winds. 3) A rapidly falling barometer reading signals an approaching storm.
How to teach it: Relate this topic to real news footage of a recent cyclone (age-appropriate) — grounding the abstract "pressure system" idea in a real, memorable event helps retention.
Practice: (a) What instrument measures wind speed? (b) What is the "eye" of a cyclone? (c) What does a rapidly falling barometer reading indicate? Answers: (a) Anemometer (b) The calm central region of a cyclone (c) An approaching or intensifying storm
What it is: Soil types (sandy, clayey, loamy) differ by particle size, which affects water retention and drainage (percolation).
Examples: 1) Sandy soil has large particles — drains fast, retains little water. 2) Clayey soil has fine particles — retains water well, drains slowly (good for paddy/rice). 3) Loamy soil is a balanced mix, ideal for most crops.
How to teach it: A simple experiment — pour equal water into sand, clay, and loam samples in funnels, and time how fast water drains through each — turns an abstract fact into an observed result.
Practice: (a) Which soil type drains water fastest? (b) Which soil type is best for growing rice? (c) Which soil type is generally considered best for most crops? Answers: (a) Sandy (b) Clayey (c) Loamy
What it is: Aerobic respiration (with oxygen) releases energy efficiently; anaerobic respiration (without oxygen) is less efficient and can produce alcohol/lactic acid.
Examples: 1) Humans breathe in oxygen; gas exchange happens in the alveoli of the lungs. 2) Yeast performs anaerobic respiration, producing alcohol and CO₂ (used in baking/brewing). 3) The epiglottis prevents food from entering the windpipe while swallowing.
How to teach it: Contrast "why do we pant after running" (needing more oxygen, aerobic) with "how does bread dough rise" (yeast's anaerobic CO₂ production) — two very different, memorable real-life hooks for the same core topic.
Practice: (a) Where does gas exchange happen in human lungs? (b) What does yeast produce during anaerobic respiration? (c) What structure prevents food from entering the windpipe? Answers: (a) Alveoli (b) Alcohol and carbon dioxide (c) The epiglottis
What it is: In plants, xylem carries water/minerals upward; phloem carries food (from photosynthesis) to other parts. In animals, blood vessels (arteries carry blood away from the heart, veins carry it back) transport blood.
Examples: 1) A blocked xylem causes a plant to wilt (no water reaching leaves). 2) Phloem moves sugars made in leaves down to the roots. 3) Arteries carry oxygen-rich blood away from the heart to the body.
How to teach it: Draw a simple plant diagram with two separate coloured "pipes" (xylem going up, phloem going down/both ways) — visually separating the two systems avoids the common mix-up between them.
Practice: (a) Which tissue carries water upward in a plant? (b) Which tissue carries food within a plant? (c) Which blood vessels carry blood away from the heart? Answers: (a) Xylem (b) Phloem (c) Arteries
What it is: Sexual reproduction involves pollination (wind: anemophily, insects: entomophily) and fertilisation, forming seeds. Asexual reproduction (vegetative propagation) grows a new plant from a part of the parent — no seeds involved.
Examples: 1) Grasses use anemophily (wind pollination). 2) A potato's "eyes" can sprout into a whole new plant (vegetative propagation). 3) Bryophyllum grows tiny new plantlets from notches along its leaf edges.
How to teach it: Have students identify, for a handful of real plants/vegetables, whether they'd grow from a seed or from a cutting/tuber — a quick sorting exercise cements the sexual/asexual distinction.
Practice: (a) What is pollination by wind called? (b) Name a plant part that can grow into a new potato plant without a seed. (c) Is vegetative propagation sexual or asexual reproduction? Answers: (a) Anemophily (b) The "eyes"/buds of a potato tuber (c) Asexual
What it is: Speed = distance ÷ time. Motion can be uniform (equal distances in equal time) or non-uniform (unequal distances in equal time).
Examples: 1) A car covering 60 km in 1 hour has a speed of 60 km/h. 2) A train covering 180 km in 3 hours: speed = 180÷3 = 60 km/h. 3) A cyclist speeding up and slowing down is in non-uniform motion.
How to teach it: Use the classic triangle memory trick (Distance over Speed × Time) — cover the quantity you want to find, and the triangle shows you the remaining formula.
Practice: (a) A car covers 240 km in 4 hours. Find its speed. (b) Is a car stuck in stop-and-go traffic in uniform or non-uniform motion? (c) If speed is 50 km/h for 3 hours, what distance is covered? Answers: (a) 60 km/h (b) Non-uniform (c) 150 km
What it is: Current flowing through a conductor produces heating, magnetic, and chemical effects. A fuse (thin wire) melts to break a circuit during an overload, protecting appliances.
Examples: 1) An electric heater uses the heating effect of current. 2) An electromagnet demonstrates the magnetic effect of current. 3) A fuse melting during a power surge is the heating effect used protectively.
How to teach it: Ask "what would happen if a thick copper wire replaced a proper fuse wire?" (it wouldn't melt in time, risking fire/damage) — this HOTS-style question tests real understanding, not just the definition.
Practice: (a) What effect of current does a heater use? (b) What is the purpose of a fuse? (c) Why is a thick copper wire unsuitable as a fuse replacement? Answers: (a) Heating effect (b) To break the circuit safely during excess current, protecting appliances (c) It won't melt in time to break the circuit during an overload
What it is: Refraction is light bending when passing between media of different density (e.g., air to water). A plane mirror produces a laterally inverted (left-right flipped) image. The retina, at the back of the eye, is where light is focused.
Examples: 1) A straw looks "bent" in a glass of water due to refraction. 2) Writing appears reversed in a mirror (lateral inversion) — that's why ambulance text is printed mirrored. 3) The retina sends the image signal to the brain via the optic nerve.
How to teach it: A real glass of water with a straw or pencil in it is the simplest, most memorable demonstration of refraction available in any classroom.
Practice: (a) What is it called when light bends passing from air into water? (b) What effect makes your right hand appear as the left hand in a mirror? (c) What part of the eye is light focused onto? Answers: (a) Refraction (b) Lateral inversion (c) The retina
What it is: Water is renewable via the water cycle but limited in usable (fresh) quantity and easily polluted, making conservation essential.
Examples: 1) Groundwater is stored between soil/rock layers after rainwater seeps down (infiltration). 2) Fixing a leaking tap saves significant water over time. 3) Overuse of groundwater can lower the water table faster than it's replenished.
How to teach it: Have students estimate how much water a dripping tap wastes in a day/week — a concrete number ("this drip wastes X litres a week") makes conservation feel urgent rather than abstract.
Practice: (a) What is groundwater? (b) Name one simple way to conserve water at home. (c) Why is water called a "precious" resource despite the water cycle constantly renewing it? Answers: (a) Water stored underground between soil/rock layers (b) Fixing leaks, turning off taps when not needed, etc. (c) Usable fresh water is still limited and easily polluted, so renewal doesn't mean unlimited
What it is: Forests release oxygen and absorb CO₂ via photosynthesis, prevent soil erosion (roots hold soil), and support biodiversity through interconnected food chains.
Examples: 1) Tree roots binding soil prevents erosion during heavy rain. 2) Deforestation increases soil erosion because roots that held the soil are removed. 3) Forests act as carbon sinks, absorbing atmospheric CO₂.
How to teach it: Ask "what happens to the soil on a hillside if all the trees are cut down?" and build the chain of consequences (no roots → loose soil → erosion → landslides/silted rivers) step by step on the board.
Practice: (a) Why does deforestation increase soil erosion? (b) What gas do forests absorb from the atmosphere? (c) Give one reason forests are called Earth's "lifeline." Answers: (a) Tree roots that held the soil in place are removed (b) Carbon dioxide (c) They provide oxygen, regulate climate, and support countless species — any valid reason
What it is: Sewage treatment removes solids (sludge, via sedimentation), then treats water further (aeration, disinfection like chlorination) before safe release or reuse.
Examples: 1) Sludge is the solid waste that settles at the bottom of a sedimentation tank. 2) Chlorination disinfects water by killing harmful germs. 3) Releasing untreated wastewater into rivers pollutes water and harms aquatic life.
How to teach it: Trace the full journey of water "from your sink, down the drain, to the treatment plant, back to a river" as a simple flow diagram — seeing it as one connected journey (not isolated facts) helps retention.
Practice: (a) What is sludge? (b) Why is chlorination used in water treatment? (c) What happens if untreated wastewater is released into a river? Answers: (a) Solid waste that settles during sedimentation (b) To disinfect water by killing germs (c) It pollutes the water and can harm aquatic life
Food & components, Sorting materials into groups, Separation of substances, Physical changes around us, Getting to know plants (parts, chlorophyll), Body movements & joints, Characteristics of living organisms, Motion and measurement of distances, Light/shadows/reflections basics, Electricity and circuits basics, Fun with magnets, Water (groundwater basics), Air around us, Garbage in garbage out (biodegradable/non-biodegradable).
Pair this with the Class 7 Logical Reasoning notes and the NSO Class 7 mock exams built earlier in this conversation.