Case-Based Questions & Answers (20)
Each case contains a short scenario followed by 2–4 focused questions. Answers are concise, NCERT-level and exam-ready.
Case 1 — Stomach Ache After Overeating
Riya felt uncomfortable after eating a large, spicy meal. She experienced stomach heaviness and slight indigestion.
Case 2 — Fish Gasping at Surface
Aquarium owner noticed fish coming to the water surface gasping for air after adding many plants and fish to a small tank.
Case 3 — Athlete Breathing Rapidly
After a sprint, Arjun was breathing rapidly and felt his heart beating fast.
Case 4 — Earthworm on Sidewalk
After heavy rain, many earthworms were seen on the sidewalk where they risk drying out when sun appears.
Case 5 — Tea Stains and Tooth Decay
A student noticed brown stains and sensitivity in teeth after frequent sweet snacks and tea.
Case 6 — Frogs in Pond
During dry season a pond shrank. Frogs were seen sitting near water with moist skin and occasionally surfacing for air.
Case 7 — Bee Visiting Flowers
A bee moves from flower to flower collecting nectar and pollen.
Case 8 — Mosquito Larva at Water Surface
In a water sample students spotted mosquito larvae hanging at the water surface using a breathing siphon.
Case 9 — Cow Chewing Cud
A cow chews cud slowly after grazing.
Case 10 — Fish with Gills Turned Pale
A fish with pale gill filaments was observed; it was less active and not feeding well.
Case 11 — Child with Frequent Urination
A child complained of passing a lot of urine and feeling very thirsty.
Case 12 — Bird Soaring High
A large bird soars using air currents with minimal wing flapping.
Case 13 — Insect in Desert
An insect survives in arid conditions with minimal water loss.
Case 14 — Amoeba Engulfing Food
Under a microscope, a student saw an Amoeba extend pseudopodia around a food particle forming a food vacuole.
Case 15 — Child Holding Nose Under Water
During swimming class, a child was taught to hold breath and submerge underwater for a short time.
Case 16 — Dog Panting After Heat Exposure
A dog pants heavily after being in the sun to cool down.
Case 17 — Snail Retracting into Shell
A snail retracts into its shell when disturbed and seals the opening with a slimy layer.
Case 18 — Fish Moving to Shallow Warmer Water
Seasonal changes warmed a lake, and fish were seen moving to shallower, warmer regions where oxygen levels were different.
Case 19 — Newborn Crying
A newborn baby cries immediately after birth and starts breathing vigorously.
Case 20 — Bee Colony Health Decline
A beekeeper observed that worker bees were weak and foraging less; some had deformed wings and short lifespans.
Note: All cases and answers are aligned with NCERT Class 7 level and designed for CBSE exam preparation. Diagrams or one-line definitions may be added where required during exams.