NCERT Class7 Science Important QA

Class7 Science Important Question Answers

1. Question: How do green plants prepare their food?
   Answer: Green plants prepare their own food by the process of photosynthesis using sunlight, carbon dioxide, and water.

2. Question: Why is sunlight important for plants?
   Answer: Sunlight provides energy needed for the process of photosynthesis.

3. Question: What are parasitic plants?
   Answer: Parasitic plants are plants that depend on other plants for their food.

4. Question: Where does digestion begin in humans?
   Answer: Digestion begins in the mouth with the help of saliva.

5. Question: Which organ absorbs digested food?
   Answer: The small intestine absorbs digested food into the bloodstream.

6. Question: What do ruminants do with their food?
   Answer: Ruminants chew cud to digest food properly.

7. Question: From which animal is wool obtained?
   Answer: Wool is obtained from sheep.

8. Question: Which insect gives silk fibre?
   Answer: Silk fibre is obtained from silkworms.

9. Question: What is spinning?
   Answer: Spinning is the process of converting fibres into yarn.

10. Question: In which direction does heat flow?
    Answer: Heat flows from a hotter object to a colder object.

11. Question: Which thermometer is used to measure body temperature?
    Answer: A clinical thermometer is used to measure body temperature.

12. Question: What happens to objects when they are heated?
    Answer: Objects expand when they are heated.

13. Question: What is the nature of lemon juice?
    Answer: Lemon juice is acidic in nature.

14. Question: Name a natural indicator.
    Answer: Turmeric is a natural indicator.

15. Question: What is the nature of soap solution?
    Answer: Soap solution is basic in nature.

16. Question: What type of change is burning of paper?
    Answer: Burning of paper is a chemical change.

17. Question: What type of change is melting of ice?
    Answer: Melting of ice is a physical change.

18. Question: What happens during a chemical change?
    Answer: New substances are formed during a chemical change.

19. Question: Does weather change every day?
    Answer: Yes, weather can change from day to day.

20. Question: What is climate?
    Answer: Climate is the average weather condition of a place over a long period of time.

21. Question: Why do polar bears have thick fur?
    Answer: Polar bears have thick fur to protect them from extreme cold.

22. Question: What causes wind?
    Answer: Wind is caused by uneven heating of the Earth’s surface.

23. Question: Can strong winds cause damage?
    Answer: Yes, strong winds can cause great destruction.

24. Question: Does air occupy space?
    Answer: Yes, air occupies space.

25. Question: How is soil formed?
    Answer: Soil is formed by the weathering of rocks over a long time.

26. Question: What increases soil fertility?
    Answer: Humus increases the fertility of soil.

27. Question: Why is soil erosion harmful?
    Answer: Soil erosion is harmful because it removes the fertile topsoil.

28. Question: What is released during respiration?
    Answer: Energy is released during respiration.

29. Question: How do fish breathe?
    Answer: Fish breathe through gills.

30. Question: Which gas is needed for aerobic respiration?
    Answer: Oxygen is needed for aerobic respiration.

31. Question: What does blood transport in the body?
    Answer: Blood transports oxygen, nutrients, and waste materials in the body.

32. Question: What is the function of the heart?
    Answer: The heart pumps blood to all parts of the body.

33. Question: Which tissue carries water in plants?
    Answer: Xylem carries water and minerals in plants.

34. Question: Why is reproduction important?
    Answer: Reproduction is important for the continuation of plant species.

35. Question: When are seeds formed?
    Answer: Seeds are formed after fertilization.

36. Question: What is budding?
    Answer: Budding is a type of asexual reproduction in which a new plant grows from a bud.

37. Question: How is speed calculated?
    Answer: Speed is calculated by dividing distance by time.

38. Question: What is a pendulum used for?
    Answer: A pendulum is used to measure time.

39. Question: What is uniform motion?
    Answer: Uniform motion is motion in which an object covers equal distances in equal intervals of time.

40. Question: What effect of electric current produces heat?
    Answer: The heating effect of electric current produces heat.

41. Question: What is the function of a fuse?
    Answer: A fuse protects electrical appliances from damage due to excess current.

42. Question: Why are metals used in electric wires?
    Answer: Metals are used because they are good conductors of electricity.

43. Question: How does light travel?
    Answer: Light travels in a straight line.

44. Question: What is the function of a mirror?
    Answer: A mirror reflects light and forms images.

45. Question: Name a natural source of light.
    Answer: The Sun is a natural source of light.

46. Question: What is the main source of fresh water?
    Answer: Rain is the main source of fresh water.

47. Question: Why is water conservation important?
    Answer: Water conservation is important to ensure availability of water in the future.

48. Question: Why do plants need water?
    Answer: Plants need water for growth, photosynthesis, and survival.

49. Question: What do forests provide to living beings?
    Answer: Forests provide oxygen, food, shelter, and raw materials.

50. Question: How do forests help in the water cycle?
    Answer: Forests help maintain the water cycle by increasing rainfall and preventing floods.

51. Question: Who depend on forests?
    Answer: Many animals and humans depend on forests for survival.

52. Question: Why should wastewater be treated?
    Answer: Wastewater should be treated to remove harmful substances before release.

53. Question: What does sewage contain?
    Answer: Sewage contains waste materials, harmful chemicals, and germs.

54. Question: What is the role of a wastewater treatment plant?
    Answer: A wastewater treatment plant cleans sewage and makes water safer for reuse.

55. Question: Why is clean water important?
    Answer: Clean water is important for good health and prevention of diseases.