The big picture
One well. Eleven ideas about how water, and illness, can travel.
| Idea | Remember | Example |
|---|---|---|
| More than not being ill | Health has three sides: physical, mental, social | A shaded school corner |
| How an illness spreads | A pathogen travels by air, water, food, touch or an insect | An uncovered cough |
| Insects that carry germs | A vector carries a pathogen; mosquitoes need still water | Empty the old tyres |
| The body's own defences | Barriers stop many germs; the immune system deals with the rest | Skin, stomach acid |
| The second time | A body usually fights a known germ sooner | Acquired immunity |
| A vaccine | Trains the body before the germ arrives | It helps prevent; it does not cure |
| Cutting the route | A step cuts a link. Order matters | A lid on a pot |
| Two kinds of illness | Communicable can spread to other people; non-communicable does not | Measles; asthma |
| Felt or measured | A symptom is felt. A sign is seen or measured | Tiredness; swelling |
| What an antibiotic does | It works against bacteria, not viruses. A doctor decides | Typhoid: yes. A cold: no |
| Resistant germs | Resistant bacteria survive and multiply. The germs are resistant, not the person | Unneeded use gives them more chances |
A real worry goes to a parent, a teacher or a doctor. It does not go to a page like this one.
Open your NCERT book. Chapter 3 is Health: The Ultimate Treasure.