Why Need
Water for people, plants, and animals.
Why Need
Why We Need Water
NCERT anchor
Looking Around 2 — Water. Why people, plants, and animals need water is the heart of the Water chapter.
What you'll learn
- All living things need water.
- Water helps body work — drinking, blood, digestion.
- We cannot live long without water.
Key concepts
Verbal: All living things need water — to drink, grow, stay clean, and keep bodies working.
Symbolic: Humans drink daily; plant roots absorb water; fish live in water.
Level 1 — Human needs
Drink water daily; bathe; clean food.
Level 1 — Inside body
Blood mostly water; helps carry food and oxygen.
Level 1 — Plants need water
Roots absorb water; wilt without it.
Level 2 — Animals
Birds, cows, fish — all need water.
Level 2 — India
Hot summer — drink more; matka cool water.
Worked example
Why do plants droop when not watered?
Step 1 — Plants need water in **stems and leaves**.
Step 2 — Water makes stems stiff.
Step 3 — No water → cells lose firmness → **droop**.
Answer: Lack of water — plant wilts.
Common mistakes
| Mistake | Why | Fix |
|---|---|---|
| Only humans need water | All life | Plants and animals too |
| Any liquid replaces water | Body needs plain water | Best drink is water |
| Drink only when thirsty | Thirst means already low | Drink regularly |
Quick check
- Name three uses of water for you.
- Fish live where?
- What happens if you don't drink water?
Stretch: What happens to a potted plant if you forget to water it for a week? Name two uses of water for you.
Revision tip: Drink a glass of water after waking up — link the habit to why your body needs water.
Open the Practice tab for graded questions on Why We Need Water.
Key Takeaways (TL;DR)
- NCERT anchor
- What you'll learn
- Key concepts
- Worked example
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