Practice Questions, Improvement in Food Resources Class 9 Notes | EduRev

Science Class 9

Class 9 : Practice Questions, Improvement in Food Resources Class 9 Notes | EduRev

The document Practice Questions, Improvement in Food Resources Class 9 Notes | EduRev is a part of the Class 9 Course Science Class 9.
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  1. Give one example of plant source which provides protein.
  2. Give one example of animal source which provides carbohydrates proteins and fats.
  3. When are Kharif crops sown ?
  4. Name the oldest method of crop improvement.
  5. Give one example each of kharif and rabi crops.
  6. What is fertigation?
  7. What is irrigation?
  8. Define the trickle irrigation ?
  9. Name one crop which can tolerate waterlogging in the field and one which cannot.
  10. At what time is irrigation required by all crops ?
  11. Define water logging.
  12. Why we should adopt crop rotation ?
  13. State any two advantages of mixed cropping.
  14. Why are legumes desirable in crop rotation ?
  15. Define intercropping.
  16. Give one example of mixed cropping.
  17. Mention one criterion for selection of the mixed crops.
  18. Mention one advantage of intercropping.
  19. Write two common weeds found in the field. How can weeds be controlled ?
  20. Define pesticide and Herbicide.
  21. Write the two example fungicide.
  22. Write the full form of 2,4-D, MCPA.
  23. Name one seed borne disease.
  24. How do biotic and abiotic factors affect crop production ?
  25. What are the desirable agronomic characteristics for crop improvements ?
  26. What are macro-nutrients and why are they so called ?
  27. Why should preventive measures and biological control methods be preferred for protecting crops ?
  28. What factors may be responsible for losses of grains during storage ?
  29. How does the use of fertilisers improve crop production ?
  30. How do insect-pests attack the crops ?
  31. Write two advantages of using chemical fertilisers over manure.
  32. Though fertilisers increase crop production, they are to be used in limited amount. Why ?
  33. Why is chemical method of controlling pests not considered good ?
  34. What are the various ways of controlling weeds ?
  35. What are the advantages of using manures ?
  36. Why do we irrigate our crops ?
  37. Name the nutrients which plants get from air, water and soil.
  38. Why are kharif crops more susceptible to infestation than the rabi crops ?
  39. How do moisture and temperature affect the life of food materials ?
  40. Why is it necessary to increase the production of crops ?
  41. What are the basic objectives of mixed cropping ?
  42. State any two advantages of mixed cropping.
  43. Compare the use of manures and fertilisers in maintaing soil fertility.
  44. Explain any one method of crop production which ensures high yields.
  45. What are the advantages of intercropping and crop rotation ?
  46. What is genetic manipulation ? How is it useful in agricultural practices ?
  47. How do storage grain losses occur ?
  48. What are the various ways of controlling weeds ?
  49. What are the advantages of using manures ?
  50. Differentiate between fumigation and spraying.
  51. Explain how excessive use of nitrate fertilisers in agricultural fields affect human life.
  52. How does manure differ from chemical fertiliser ? Mention two advantages of using chemical fertilisers over manure ?
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