Nature's Gifts: 30 flashcards
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1. Why are forests called the 'lungs of the Earth'?
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Because trees absorb carbon dioxide and release oxygen, helping maintain the balance of atmospheric gases needed for breathing.
2. Name two products obtained from forests besides timber.
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Medicinal plants and honey (or fruits, gum, resin).
3. What are the two main categories of crops in India?
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Food crops and cash crops.
4. Define a food crop.
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A crop grown mainly to directly feed people (e.g., rice, wheat).
5. Define a cash crop.
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A crop grown mainly to be sold or used as industrial raw material (e.g., cotton, sugarcane).
6. Classify these crops as food or cash crops: wheat, cotton, rice, sugarcane.
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Wheat and rice are food crops; cotton and sugarcane are cash crops.
7. Which crop is a major food crop grown in West Bengal, Punjab, and Andhra Pradesh?
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Rice.
8. Which crop is a major cash crop grown in Gujarat, Maharashtra, and Madhya Pradesh?
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Cotton.
9. What is a fibre?
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A thin, thread-like strand that can be spun into yarn and woven into fabric.
10. Name two plant fibres and two animal fibres.
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Plant fibres: cotton, jute; Animal fibres: wool, silk.
11. What is ginning?
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The process of separating cotton fibres from the plant's seeds.
12. What is spinning?
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Twisting loose fibres together to make yarn or thread.
13. What is weaving?
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Interlacing yarn on a loom to produce fabric.
14. List the three main steps in turning cotton into cloth.
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Ginning, spinning, and weaving.
15. What is sericulture?
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The practice of raising silkworms to produce silk.
16. How is silk fibre obtained from silkworms?
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Silkworms spin cocoons of silk thread; workers unwind (reel) the thread from the cocoon to produce silk yarn.
17. Why is cotton clothing preferred in hot regions?
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Because cotton is breathable, absorbs sweat, and lets air pass through, keeping the body cool.
18. Why is wool clothing preferred in cold regions like the Himalayas?
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Because wool traps air within its fibres, and trapped air is a poor conductor of heat, keeping body heat in.
19. From which part of the jute plant is jute fibre obtained?
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The stem.
20. What is one common use of jute fibre?
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Making sacks, ropes, or mats.
21. Which type of forest is found in areas with heavy rainfall?
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Evergreen forests.
22. Which type of forest has trees that shed their leaves during the dry season?
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Deciduous forests.
23. What are the two main sources of natural fibres?
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Plants and animals.
24. What is the difference between a plant fibre and an animal fibre?
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Plant fibres come from plants (e.g., cotton); animal fibres come from animals (e.g., wool).
25. Why is cotton called a cash crop?
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Because it is grown mainly to be sold for profit or used as industrial raw material, rather than eaten directly.
26. Name two major growing regions for wheat in India.
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Uttar Pradesh and Punjab (also Haryana).
27. Name two major growing regions for sugarcane in India.
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Uttar Pradesh and Maharashtra.
28. What is the role of forests in maintaining climate and rainfall?
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Forests help maintain the balance of climate and rainfall.
29. What is the first step in making cotton fabric from raw cotton?
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Ginning.
30. What is the purpose of spinning in cloth making?
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To twist loose fibres together into strong yarn or thread.
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