Have You Prepared For LEA, Check Your Knowledge!

1. Which of the following is a protective covering made of materials such as sawdust, moss, compost, and gravel?

• a) Mulch
• b) Greenery
• c) Fertilizer
• d) Cover cropping

2. What is the main purpose of using mulch in agriculture?

• a) Weed control
• b) Fertilizer application
• c) Increase soil nutrients
• d) Reduce soil pH

3. What material is commonly used in mulching for weed control?

• a) Rice husk
• b) Plastic cover
• c) Gravel
• d) All of the above

4. What is the purpose of applying fertilizer to crops?

• a) To increase nutrients in the soil
• b) To prevent weeds
• c) To protect crops from pests
• d) To reduce soil acidity

5. Which grafting method is used to bypass a damaged area of a tree trunk?

• a) Approach grafting
• b) Bark grafting
• c) Inarching grafting
• d) Saddle grafting

6. What is the main characteristic sought in a rootstock used for grafting?

• a) Disease resistance
• b) High fruit yield
• c) Fast growth
• d) Pest resistance

7. In grafting, which part is used to propagate the desired traits of the plant?

• a) Scion
• b) Rootstock
• c) Leaves
• d) Stem

8. Which of the following is an example of a common organic mulch?

• a) Gravel
• b) Rice husk
• c) Plastic sheet
• d) All of the above

9. What is the primary function of mulch in crop production?

• a) Nutrient supply
• b) Weed control
• c) Pest resistance
• d) Disease control

10. Which type of mulch is used to retain soil moisture and regulate temperature?

• a) Organic mulch
• b) Inorganic mulch
• c) Both A and B
• d) None of the above

11. Which of the following fertilizers provides a source of nitrogen for crops?

• a) Urea
• b) Super phosphate
• c) Potash
• d) Zinc sulfate

12. Which element is primarily responsible for promoting root development in plants?

• a) Nitrogen
• b) Phosphorus
• c) Potassium
• d) Magnesium

13. What is the main advantage of using inarching grafting?

• a) Increases root mass
• b) Bypasses damaged trunk areas
• c) Promotes rapid fruiting
• d) Improves drought resistance

14. What is the best time to apply organic mulch to crops?

• a) Before planting
• b) After planting
• c) During the growing season
• d) At the time of harvesting

15. Which of the following can NOT be used as a mulching material?

• a) Plastic
• b) Stone
• c) Sand
• d) Sawdust

16. What is a major disadvantage of plastic mulch?

• a) Low durability
• b) Increases soil temperature
• c) Requires removal and disposal
• d) Competes with crops for nutrients

17. What is the key benefit of using compost as mulch?

• a) Provides nutrients to plants
• b) Prevents evaporation
• c) Controls soil erosion
• d) All of the above

18. What type of mulch is particularly effective for controlling soil erosion?

• a) Gravel
• b) Sawdust
• c) Compost
• d) Plastic sheet

19. Which of the following grafting methods involves fusing two stems together?

• a) Inarching
• b) Approach grafting
• c) Bud grafting
• d) Saddle grafting

20. Which nutrient is most commonly deficient in soils in the Philippines?

• a) Nitrogen
• b) Phosphorus
• c) Potassium
• d) Calcium

21. What type of mulch can help with water conservation in dry regions?

• a) Organic mulch
• b) Rock mulch
• c) Both A and B
• d) None of the above

22. Which of the following is a characteristic of perlite as a mulch material?

• a) It retains moisture
• b) It is heavy
• c) It improves drainage
• d) It decomposes rapidly

23. What type of plant is commonly used for green manure?

• a) Alfalfa
• b) Clover
• c) Both A and B
• d) Corn

24. What is the ideal thickness of organic mulch around plants?

• a) 1 inch
• b) 2-4 inches
• c) 6-8 inches
• d) 10 inches

25. Which of the following is a benefit of using green manure?

• a) Enhances soil structure
• b) Reduces erosion
• c) Provides nutrients
• d) All of the above

26. What is a common cover crop for improving nitrogen levels in the soil?

• a) Barley
• b) Soybean
• c) Wheat
• d) Oats

27. Which method of irrigation is most efficient for water conservation?

• a) Drip irrigation
• b) Flood irrigation
• c) Furrow irrigation
• d) Surface irrigation

28. What is the primary benefit of crop rotation?

• a) Increased yield
• b) Reduced pest pressure
• c) Improved soil health
• d) All of the above

29. Which of the following is not a benefit of cover cropping?

• a) Soil erosion prevention
• b) Weeds suppression
• c) Increased pest populations
• d) Nutrient cycling

30. What is the primary purpose of tillage?

• a) Soil preparation
• b) Seed planting
• c) Pest control
• d) Harvesting

31. Which of the following is considered a significant practice in organic farming?

• a) Use of synthetic fertilizers
• b) Crop rotation
• c) Monoculture
• d) Use of pesticides

32. Which nutrient is primarily responsible for promoting root development in plants?

• a) Nitrogen
• b) Phosphorus
• c) Potassium
• d) Calcium

33. What is the term for the movement of water from the soil to the atmosphere?

• a) Evaporation
• b) Transpiration
• c) Condensation
• d) Precipitation

34. Which of the following is a leguminous crop?

• a) Wheat
• b) Soybean
• c) Barley
• d) Rice

35. What is the primary function of potassium in plant nutrition?

• a) Enhancing root growth
• b) Regulating water uptake
• c) Promoting flowering
• d) Improving soil structure

36. Which practice is essential for sustainable agriculture?

• a) Monocropping
• b) Crop rotation
• c) Over-fertilization
• d) Pesticide overuse

37. Which of the following pests is known to cause significant damage to rice crops?

• a) Cotton bollworm
• b) Armyworm
• c) Rice weevil
• d) Locust

38. What is the purpose of mulching in agriculture?

• a) Weed control
• b) Fertilization
• c) Pest control
• d) All of the above

39. Which method is commonly used for soil conservation?

• a) Deforestation
• b) Contour plowing
• c) Excessive tillage
• d) Overgrazing

40. What is the primary benefit of crop rotation?

• a) Reduces pests
• b) Increases yield
• c) Improves soil fertility
• d) All of the above

41. Which plant hormone is primarily responsible for promoting cell elongation?

• a) Auxin
• b) Gibberellin
• c) Cytokinin
• d) Ethylene

42. What is the primary purpose of soil testing in agriculture?

• a) To determine soil texture
• b) To assess nutrient levels
• c) To identify soil pH
• d) All of the above

43. Which agricultural practice helps to improve soil structure?

• a) Overgrazing
• b) Cover cropping
• c) Excessive tillage
• d) None of the above

44. What is the main advantage of integrated pest management (IPM)?

• a) Reduced chemical usage
• b) Higher crop yields
• c) Improved soil health
• d) Increased biodiversity

45. Which of the following is considered a major greenhouse gas?

• a) Oxygen
• b) Carbon dioxide
• c) Nitrogen
• d) Hydrogen

46. What is the primary use of biochar in agriculture?

• a) Soil amendment
• b) Fertilizer
• c) Pesticide
• d) Herbicide

47. Which of the following is a common method of irrigation?

• a) Drip irrigation
• b) Surface irrigation
• c) Sprinkler irrigation
• d) All of the above

48. Which crop is most sensitive to waterlogging?

• a) Rice
• b) Corn
• c) Soybean
• d) Potato

49. What is the ideal pH range for most crops?

• a) 4.0 – 5.5
• b) 5.5 – 6.5
• c) 6.5 – 7.5
• d) 7.5 – 8.5

50. What is the primary role of nitrogen-fixing bacteria in agriculture?

• a) To decompose organic matter
• b) To convert nitrogen gas into a usable form
• c) To promote root growth
• d) To enhance water retention