Nature's Treasures — Mastery

Q1. Which everyday observation, listed in the chapter, indicates the presence of air around us?

• A. Sand turning white on the beach
• B. A magnet attracting iron filings
• C. Snow melting on a hill
• D. Leaves of a tree rustling or clothes on a line swaying

Q2. The chapter contrasts two types of wind. Which pairing is correct?

• A. Fast-blowing wind during a storm; gentle wind called a breeze
• B. Fast wind called a breeze; slow wind during a storm
• C. Wind that pushes only firki, not windmill
• D. Wind that is the same speed everywhere

Q3. Which of the following are listed in the chapter as daily uses of water? I. Drinking and cooking II. Bathing, washing and cleaning III. Growing crops and for industrial purposes Select the correct combination.

• A. I and II only
• B. II and III only
• C. I and III only
• D. All three

Q4. Priya wants to reduce wastage of water at home. Which of these is suggested in the chapter as an effective step?

• A. Letting the tap run while brushing teeth
• B. Using saline water from the sea for drinking
• C. Pouring water into rivers
• D. Turning off taps when not in use and fixing leakages

Q5. Throwing plastic bags and wrappers into rivers and ponds is a major cause of

• A. Soil formation
• B. Water pollution
• C. Rainwater harvesting
• D. Wind energy

Q6. Why does the chapter call the Sun the main source of energy for life on Earth?

• A. Because plants use sunlight to make food, and animals (including humans) feed on plants and other animals
• B. Because the Sun directly cooks food for animals
• C. Because the Sun provides oxygen to humans
• D. Because the Sun is the closest star to Earth

Q7. In the picture in Q.10 of the chapter, a parabolic device is used to cook food in the open. One benefit and one drawback of this energy are best given by

• A. Benefit: it pollutes air; Drawback: it is expensive
• B. Benefit: it is non-polluting and free; Drawback: it does not work when there is no sunlight
• C. Benefit: it works at night; Drawback: it produces smoke
• D. Benefit: it uses coal; Drawback: it is renewable

Q8. The chapter links the Sun to the water cycle. In which part of the cycle does the Sun play a direct role?

• A. Pollination of crops
• B. Evaporation of water
• C. Formation of magnets
• D. Refining of petroleum

Q9. According to the chapter, forests are important because they

• A. Are the natural home for many wild animals, birds and insects, providing them food and shelter
• B. Provide petrol and diesel to cities
• C. Increase saline water in rivers
• D. Replace solar panels

Q10. Which traditional Indian practice of protecting and preserving forests is referenced in the chapter (already studied in 'Diversity in the Living World')?

• A. Sacred groves
• B. Iron mining
• C. Slash-and-burn farming
• D. Monsoon flooding

Q11. Ajji collects only nellikai (Indian gooseberry) that have fallen on the ground and tells children not to pluck fruits from the trees. The BEST reason behind this practice is

• A. Fruits taste bad when plucked
• B. It ensures fruits are left for animals and birds to eat, and the dropped seeds help new trees to grow
• C. It saves time for the family
• D. Plucked fruits cause water pollution

Q12. Ajji explains that roots of plants hold on to the soil. The main effect of this, mentioned in the chapter, is

• A. The soil becomes warmer
• B. The soil is prevented from being washed away
• C. The soil becomes saline
• D. The soil turns into rocks

Q13. Fallen leaves on the forest floor decay over time. According to Ajji, what is the effect on the soil?

• A. The soil becomes acidic and harmful for plants
• B. The soil is enriched with nutrients and used by new plants to grow
• C. The soil is washed away by the leaves
• D. The soil becomes a rock instantly

Q14. Which rock is shown in Fig. 11.7 being used like bricks for building?

• A. Slate
• B. Granite
• C. Marble
• D. Laterite

Q15. Fig. 11.8(a) and 11.8(b) of the chapter show ancient tools made by humans from

• A. Plastic
• B. Iron alloys
• C. Stone (rocks)
• D. Glass

Q16. According to the chapter, natural gas is mainly used in our country for

• A. Manufacturing plastic
• B. Making roofing tiles
• C. Cooking and generating electricity
• D. Producing magnets

Q17. Coal in India is mainly used for

• A. Making clothes for export
• B. Producing magnets in laboratories
• C. Manufacturing solar panels
• D. Producing electricity

Q18. Earlier, coal, wood and dung cakes were used as fuels for cooking. Nowadays, these are gradually being replaced by

• A. Sand and pebbles
• B. Salt and sugar
• C. Iron and copper sheets
• D. Less polluting natural gas and Liquefied Petroleum Gas (LPG)

Q19. The chapter suggests "doing our bit" to conserve fossil fuels. Which pair of actions is listed in the chapter?

• A. Driving private cars more often; printing more on paper
• B. Burning more wood at home; using more plastic
• C. Cutting down forests; eating only packaged food
• D. Walking or cycling to nearby places; using public transport

Q20. Resources that are in limited quantities and do not get replenished within a reasonable period are called

• A. Renewable resources
• B. Human-made resources
• C. Renewable energy sources
• D. Non-renewable resources

Q21. Consider the statement: "Machines are a resource found in nature." The chapter would mark this statement as

• A. True
• B. Doubtful
• C. Cannot be decided
• D. False — machines are human-made, not natural

Q22. Which of the following statements, as per the chapter, is TRUE?

• A. Nature has all the resources to meet every human's unlimited needs
• B. Natural gas is a renewable resource
• C. Air is a renewable resource
• D. Machines are a resource found in nature

Q23. Which of the following is listed in the chapter as an example of a renewable natural resource?

• A. Coal
• B. Petroleum
• C. Natural gas
• D. Water

Q24. Two ways in which human activities pollute the air, according to the chapter, are

• A. Drinking clean water; sleeping at night
• B. Eating fruits; playing on grass
• C. Painting walls white; reading books
• D. Burning fossil fuels in vehicles; large-scale tree-cutting that reduces green cover

Q25. Amma points out that some modern vehicles do not release any smoke. Which type of vehicle is she most likely referring to?

• A. Petrol scooter
• B. Diesel truck
• C. Coal-fired engine
• D. Electric vehicle

Q26. A Class 6 teacher wants Class 6 students to understand that wind is moving air and can do work. Which classroom activity is the BEST first step, as suggested by Activity 11.2?

• A. Reading a paragraph about wind energy from a book
• B. Showing a documentary on global wind patterns
• C. Memorising the percentages of gases in air
• D. Making a firki (paper pinwheel) and observing what makes it rotate

Q27. A student in Rampur writes: "Petrol and diesel are renewable resources because we make them at refineries." The teacher's BEST response, supported by the chapter, is to point out that

• A. The student is correct; refineries renew petrol every month
• B. Petrol is renewable but diesel is not
• C. Refineries only process petroleum that takes millions of years to form — so petrol and diesel are non-renewable
• D. Both fuels become renewable if mixed with water

Q28. Students of a school in Rampur want to plan ways to use less water. Which of the following is the BEST plan, based on the chapter?

• A. Run all taps for an hour every morning to clean the pipes
• B. Use saline water from the sea for drinking
• C. Pour the morning's leftover water into the drain
• D. Fix all leaking taps, turn off taps when not in use, and install rainwater harvesting for the school

Q29. In Q.14 of the chapter, a tree diagram divides natural resources into renewable and non-renewable. Three blanks under "renewable" need to be filled. The correct set of three terms is

• A. Coal, petroleum, natural gas
• B. Fossil fuels, coal, petroleum
• C. Minerals, soil, rocks
• D. Forest, air, water

Q30. Why does the chapter argue that continuously cutting down trees on a large scale is harmful, beyond just losing the trees themselves?

• A. Because it makes solar panels less efficient
• B. Because it causes more rainwater harvesting
• C. Because forests support wild animals, birds and insects with food and shelter — so deforestation harms the wider biodiversity that depends on them
• D. Because it increases the percentage of nitrogen in air to 90%