Nature’s Treasures | Class 6 Science Notes
By ConceptScroll Team · Published on 17 July 2026 · 4 min read
Nature’s Treasures – this guide gives you a concise, exam-ready overview of Nature’s Treasures from Class 6 Science, written by ConceptScroll editors and reviewed against the latest NCERT textbook.
11.1 Air
Air is an invisible, odourless gas that surrounds the Earth and is essential for the survival of all living beings. It is a mixture of several gases, primarily nitrogen (78%), oxygen (21%), and small amounts of argon, carbon dioxide, and other gases. Oxygen is crucial because living organisms need it to perform vital functions such as respiration. Humans and animals breathe in oxygen and breathe out carbon dioxide. Plants, on the other hand, use carbon dioxide for photosynthesis and release oxygen. We cannot survive without oxygen for even a few minutes, although we can live without food or water for several days. Air is also responsible for various natural phenomena such as rustling of leaves, movement of clothes on a line, or fluttering pages of a book when a fan is switched on. When air moves, it is called wind. Wind can be gentle like a breeze or strong like a storm. Wind energy is harnessed by devices such as windmills, which rotate when wind blows and can be used to generate electricity, pump water, or run flour mills. Windmill farms, like Muppandal in Tamil Nadu, Jaisalmer in Rajasthan, and Brahmanvel in Maharashtra, are large areas with many windmills that produce electricity using wind energy. Breathing exercises, like taking deep breaths and slowly exhaling, help bring more fresh air into the lungs, promoting good health. Holding breath for a long time is difficult because the body needs a constant supply of oxygen to function properly. This section introduces the importance of air as a natural resource necessary for life and energy.
📊 Diagram: Fig. 11.1 shows the composition of air using 100 squares: 78 squares represent nitrogen, 21 squares oxygen, and 1 square argon, carbon dioxide, and other gases. Images depict a village setting, breathing exercises, and a firki (paper pinwheel) demonstrating wind movement.
🧪 Activity: Activity 11.1: Students perform breathing exercises by taking deep breaths, holding breath, and observing their feelings to understand the importance of oxygen in air.
🔗 Connection: This section leads to the next section on water, another essential natural resource necessary for life and daily activities.
Frequently asked questions
Make a list of activities you do in your daily life and write down the natural resources used directly or indirectly for each activity. In Table 11.4, some items are already filled in. Using them as a guide, fill the remaining blank rows. Table 11.4: Natural resources used | Activity | Natural resource | | --- | --- | | Washing clothes | Water | | Making clay toys | | | Collecting firewood | | | Making kites | | | Having breakfast | | How many natural resources did you list? Compare your list with that of your friend.
Students should list their daily activities and identify natural resources used. For example:
- Making clay toys: Soil
- Collecting firewood: Forests (wood)
- Making kites: Paper (from trees), string (cotton or synthetic)
- Having breakfast: Food (plants/animals), water
The number of natural resources listed will vary. Comparing with a friend helps understand the variety and commonality of resources used.
Fig. 11.9 shows items related to natural resources. Match them with their jumbled up names. Make another table and write the names of these resources. Classify these resources as renewable or non-renewable.
Students should match the images in Fig. 11.9 with the jumbled names provided in the textbook. After matching, they should list the resources and classify them:
Examples:
- Air: Renewable
- Coal: Non-renewable
- Water: Renewable
- Petroleum: Non-renewable
- Forests: Renewable
- Natural gas: Non-renewable
This exercise helps students identify natural resources and understand their classification.
State whether the following statements are True [T] or False [F]. If False, correct them. (i) Nature has all the resources to meet human needs. [ ] (ii) Machines are a resource found in nature. [ ] (iii) Natural gas is a non-renewable resource. [ ] (iv) Air is a renewable resource. [ ]
(i) False. Correction: Nature has many resources but they are limited and may not meet all human needs if overused. (ii) False. Correction: Machines are human-made resources, not found in nature. (iii) True. (iv) True.
Fill in the blanks using the most appropriate option— (i) A fuel that is commonly used in two wheelers like scooters or bikes is... (a) Kerosene (b) Petrol (c) Diesel (d) LPG (ii) An example of a renewable resource is ... (a) Coal (b) Water (c) Natural gas (d) Petrol
(i) Correct answer: (b) Petrol Explanation: Petrol is commonly used as fuel in two wheelers like scooters and bikes.
(ii) Correct answer: (b) Water Explanation: Water is a renewable resource as it is replenished naturally through the water cycle.
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