Common misconceptions › Class 8 › Science › Health: The Ultimate Treasure Class 8 Science · Chapter 3 · NCERT (hecu103)
Health: The Ultimate Treasure: common misconceptions
See the tempting mistake students make in Health: The Ultimate Treasure, why it feels right at first glance, and a worked visual example that shows the right idea.
Worked visual “If your child says…” (8) Teach & practice The tempting mistake & worked visual Do antibiotics treat viral infections? Wrong
An antibiotic kills the virus that causes a cold.
Why it feels right. A medicine for one infection seems useful for every infection.
Right
Antibiotics act on bacteria. Viral infections involve different targets.
Worked example
Example bacterial target
Bacterial cell wall → Some antibiotics block its formation
Cold virus
No bacterial cell wall → Same target is absent
The antibiotic's bacterial target is absent in a cold virus. A common cold is caused by viruses. Its virus lacks the bacterial structures that many antibiotics target. If your child says… (8 concept checks in this chapter)
As you work through Health: The Ultimate Treasure , listen for these everyday misunderstandings and use the prompt alongside each one.
If your child says…
“Screens only affect my eyes.”
Ask together If phone use keeps you awake, which need is being missed? What’s true Excessive screen use can affect sleep and emotional well-being even when eyes feel comfortable. If your child says…
“Cleaning rubbish only makes places look nicer.”
Ask together What happens to that breeding place when the trapped water is removed? What’s true Clearing containers that collect water can reduce mosquito breeding. If your child says…
“Every disease comes from someone else.”
Ask together How would avoiding people supply a missing nutrient? What’s true Scurvy develops from too little vitamin C, without being caught from anyone. If your child says…
“A normal reading means nothing is wrong.”
Ask together Does a normal temperature make the person's dizziness disappear? What’s true Someone's felt symptoms remain useful evidence even when measurements are normal. If your child says…
“The mosquito itself causes malaria.”
Ask together Which enters during the bite: the whole mosquito or the parasite it carries? What’s true An infected mosquito carries the parasite that causes malaria. If your child says…
“Handwashing protects me from every infection.”
Ask together What would keep a mosquito from biting a freshly washed arm? What’s true A useful precaution against one route may leave another route open. If your child says…
“Cowpox is just smallpox in cows.”
Ask together Does recognising similarities between two viruses make them the same virus? What’s true Cowpox and smallpox have different, related viruses whose shared features can be recognised by defences. If your child says…
“Antibiotics cure every infection.”
Ask together What can the medicine target if the virus lacks those bacterial parts? What’s true Antibacterial antibiotics cannot treat flu because its virus lacks the bacterial targets they act on. Use this chapter three ways Previous chapter The Invisible Living World: Beyond Our Naked Eye Next chapter Electricity: Magnetic and Heating Effects
In the app, your child answers a short check-in with confidence taps, and you see which of these misunderstandings showed up—and which ones are gone.
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