This MCQ module is based on: Water Cycle, Humidity and Water Conservation
TOPIC 29 OF 46
Water Cycle, Humidity and Water Conservation
🎓 Class 6
Science
CBSE
Theory
Ch 8 — A Journey through States of Water
⏱ ~14 min
🌐 Language: [gtranslate]
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8.7 The Water Cycle — Water's Big Journey
The water we drink today is the same water that was here millions of years ago — it just keeps travelling in a loop! This never-ending journey is called the water cycle (also called the hydrological cycle).
The Five Main Steps
- Evaporation: The Sun's heat warms the water in oceans, rivers and lakes. Water evaporates and rises as invisible water vapour. Plants also release water vapour through their leaves — called transpiration.
- Condensation: Higher up, the air is cold. The water vapour cools and condenses into tiny droplets — these droplets together form clouds.
- Precipitation: When the drops grow heavy, they fall back to Earth as rain, or as snow and hail in cold places.
- Collection: The fallen water flows over land into rivers, lakes and oceans. Some seeps into the ground to become groundwater.
- Repeat! The Sun heats this water again, and the cycle starts once more.
Activity 8.6 — Make a Mini Water Cycle in a Bottle L6 Create
You need: a clean transparent plastic bottle with cap, a little warm water, sunlight.
- Pour about 2–3 cm of warm water into the bottle.
- Close the cap tightly.
- Place the bottle in bright sunlight for 15 minutes.
- Observe the sides of the bottle and the cap closely.
Predict: Will it "rain" inside the bottle?
Tiny water droplets appear on the inside walls and near the cap. Some even slide down like a little "shower"! The warm water evaporated, the vapour condensed on the cool upper walls, and fell back as tiny droplets — a full water cycle in a bottle.
8.8 Humidity — Water Vapour in the Air
Humidity tells us how much invisible water vapour is floating in the air around us.
High Humidity
Air has a lot of water vapour. Sweat does not dry easily, so we feel sticky and uncomfortable. Clothes take longer to dry.
Low Humidity
Air is dry. Skin feels dry, lips can get chapped, and clothes dry quickly. Common in winter and deserts.
A hygrometer is the instrument used by weather scientists to measure humidity.
8.9 Atmospheric Water Generators — Water from Thin Air
In dry places where people cannot easily get drinking water, scientists have built amazing machines called Atmospheric Water Generators (AWG). These pull water vapour from the air and condense it into clean, drinkable water!
How does an AWG work? It is just the condensation step of the water cycle, done by a machine:
- A fan pulls in warm, humid air.
- The air is cooled inside the machine.
- Water vapour condenses into drops on cold coils.
- The drops are collected, filtered, and stored as safe drinking water.
8.10 Why Must We Save Water?
Water covers most of our planet — but almost all of it is salty ocean water. Out of every 100 drops of water on Earth:
- About 97 drops are salty (oceans and seas) — we cannot drink them.
- Only about 3 drops are fresh — and most of that is frozen in ice caps and glaciers.
- Less than 1 drop is actually available to us as rivers, lakes and groundwater!
Water crisis: India has huge populations, busy farms and factories — all needing water. Many regions like parts of Rajasthan, Maharashtra, Karnataka and Tamil Nadu already face water shortages every summer. If we waste water, people and animals suffer.
Simple Ways to Save Water — At Home, School & Community
- Turn off the tap while brushing your teeth or soaping your hands.
- Fix leaky taps quickly — a single dripping tap can waste many buckets a month.
- Reuse water cleverly — water used for washing vegetables or mopping the floor can water plants.
- Take shorter showers and use a bucket-bath when possible.
- Rainwater harvesting: collect rainwater from rooftops into a tank or pit for later use.
- At school: report dripping taps, help clean drinking-water coolers, and remind friends.
Group Activity — The Water Conservation Pledge L5 Evaluate
You need: a notebook, your classmates.
- In groups of four, list all the ways your family uses water in a day — from cooking to flushing.
- For each, think of one smart change that saves water.
- Write your group's "Water Pledge" with 5 promises. Example: "I will close the tap while brushing."
- Decorate the pledge and put it up in your classroom.
Predict: Can your family save 10 buckets of water in a week if every person follows 3 promises?
If each family member saves even 3 buckets a week, a family of 4 saves 12 buckets per week. A colony of 100 families saves 1,200 buckets — enough drinking water for many families for many days! Every drop counts.
Interactive: Save a Drop — Habits Sorter L4
Drag each habit into the correct bin — Saves Water or Wastes Water.
Turn off tap while brushing
Leave tap running to wash one cup
Fix a dripping tap today
Water plants with used rinsing water
Take a 30-minute shower every day
Collect rainwater in a barrel
Wash the car with a running hose
Use a bucket for bathing
✓ Saves Water
✗ Wastes Water
Competency-Based Questions
Aavi's town had a dry summer. Her school started a campaign: students placed empty buckets under rooftop pipes during the first monsoon shower. They collected hundreds of litres of rainwater for the school garden. Meanwhile, Aavi noticed that the classroom hygrometer read 85% on one sticky day and only 30% on a dry winter morning.
Q1. Name the main stages of the water cycle in order. L1
Evaporation → Condensation → Precipitation (rain/snow) → Collection in rivers, lakes and oceans → repeat.
Q2. What does a hygrometer reading of 85% mean for Aavi's day? L2
Answer: B. A high humidity reading (85%) means the air holds a lot of water vapour — that is why the day feels sticky and sweat does not dry quickly.
Q3. How does an Atmospheric Water Generator (AWG) make drinking water? L2
An AWG pulls in humid air with a fan, cools it over cold coils so the water vapour condenses into liquid drops, and then collects, filters and stores the water for drinking. It is basically a little cloud-machine.
Q4. Of all the water on Earth, how much is directly available to us for drinking? Why is it important to save it? L4
Only about 1% of Earth's water is easily available fresh water (rivers, lakes, shallow groundwater). 97% is salty ocean; most of the remaining 3% is locked in ice. Since this tiny share must serve all humans, animals, farms and factories, we must save every drop or many regions will face serious shortages.
Q5. Suggest three water-saving actions Aavi's school can take during its campaign. L6
Examples: (i) Set up rainwater harvesting from the school roof into a storage tank. (ii) Install taps that shut off automatically, or put reminders on each tap. (iii) Use the mop-bucket water to water trees in the school garden. Other good ideas: fix leaks at once, teach shorter handwashing routines, and hold a "Save Water" poster contest.
Assertion – Reason
Assertion (A): Clouds are made of frozen rocks floating in the sky.
Reason (R): Water vapour condenses into tiny water droplets when it cools.
Answer: D. A is false — clouds are tiny water droplets (or ice crystals in cold places), not rocks. R is a correct fact about condensation.
Assertion (A): Clothes dry slowly on humid monsoon days.
Reason (R): Humid air already contains lots of water vapour, so it accepts less from the wet clothes.
Answer: A. Both statements are correct and the reason properly explains why evaporation slows when humidity is high.
Assertion (A): Rainwater harvesting is a way to save water.
Reason (R): It collects rain that would otherwise flow away and allows us to use it later.
Answer: A. Both are true, and the reason is exactly why rainwater harvesting is a great water-saving method.
Frequently Asked Questions — Water Cycle, Humidity and Water Conservation
What does the topic 'Water Cycle, Humidity and Water Conservation' cover in Class 6 Science?
The topic 'Water Cycle, Humidity and Water Conservation' is part of NCERT Class 6 Science Chapter 8 — A Journey through States of Water. It covers the key ideas of water cycle, evaporation, condensation, precipitation, humidity, water conservation, rainwater, explained through everyday examples, labelled diagrams and hands-on activities from the NCERT Curiosity textbook. Class 6 students learn simple definitions, see why each idea matters in daily life, and try short experiments and observations. The lesson uses easy language, colourful pictures and small questions so that young learners build a strong base for higher classes and for competency-based questions in CBSE school tests.
Why is 'Water Cycle, Humidity and Water Conservation' important for Class 6 NCERT Science?
'Water Cycle, Humidity and Water Conservation' is important because it builds the first ideas of science that Class 6 students will use again in Class 7, 8 and beyond. NCERT Chapter 8 — A Journey through States of Water — introduces water cycle and connects it to things children already see at home, at school and in nature. Learning this topic helps students ask better questions, understand simple news about science, and score well in CBSE tests that use competency-based questions. The chapter also supports NEP 2020 by encouraging curiosity, observation and learning by doing rather than only reading and memorising.
What are the key ideas students should remember from Water Cycle, Humidity and Water Conservation?
The key ideas in 'Water Cycle, Humidity and Water Conservation' for Class 6 Science are: water cycle, evaporation, condensation, precipitation, humidity, water conservation, rainwater. Students should be able to say each term in their own words, give one or two easy examples from daily life, and draw a small labelled diagram where needed. A good way to revise is to make flashcards, write a short note in the science notebook, and solve the NCERT in-text and exercise questions of Chapter 8. Linking every idea to something seen at home or school — in the kitchen, garden, playground or sky — makes these ideas easy to remember for unit tests and the annual CBSE examination.
How is Water Cycle, Humidity and Water Conservation taught using activities in NCERT Curiosity Class 6?
NCERT Curiosity Class 6 Science teaches 'Water Cycle, Humidity and Water Conservation' through an inquiry-based approach using Predict–Observe–Explain activities. Students first make a guess, then try a small experiment with safe, easily available materials, and finally explain what happened and why. This matches the NEP 2020 focus on learning by doing. For Chapter 8 — A Journey through States of Water — the textbook has hands-on tasks, labelled pictures and thinking questions built for Bloom's Taxonomy Levels 1 to 6. Teachers use these activities, along with competency-based questions (CBQs) and assertion–reason items, to check real understanding instead of only rote learning.
What real-life examples of water cycle can Class 6 students see at home?
Class 6 students can see water cycle at home in many simple ways linked to 'Water Cycle, Humidity and Water Conservation'. Kitchens, school bags, playgrounds, the garden and the night sky are full of examples that match NCERT Chapter 8 — A Journey through States of Water. For example, students can look at food labels, watch changes while cooking, try safe activities with water, magnets or shadows, and observe the Sun, Moon and weather each day. Keeping a small science diary — with the date, what was observed and a quick drawing — turns daily life into a mini science lab. These real-life links make concepts easy to remember and help in answering competency-based questions in CBSE Class 6 Science.
How does 'Water Cycle, Humidity and Water Conservation' connect to other chapters of Class 6 Science?
'Water Cycle, Humidity and Water Conservation' connects to many other chapters in NCERT Class 6 Science Curiosity. The ideas of water cycle come back when students study related topics like diversity in the living world, food, magnets, measurement, materials, temperature, water, separation, habitats, natural resources and the solar system. For example, what students learn here helps them build mental pictures for later chapters and for Class 7 and Class 8 Science. Teachers often ask cross-chapter questions in CBSE exams to check if students can use what they learned in Chapter 8 — A Journey through States of Water — in new situations. This linked approach matches the NEP 2020 and NCF 2023 focus on holistic, competency-based learning.
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