Botany Questions and Answers | Online Quiz for Practice

46. The process by which nutrient chemicals or contaminants are dissolved and carried away by water, or are moved into a lower layer of soil

1. Incineration
2. Leaching
3. Mulching
4. Desertification

47. The word Agriculture is derived from

1. Arabic
2. French
3. Greek
4. Latin

48. The worst enemy of ozone is

1. CH4
2. CO.
3. Liquid NH3
4. SO2

49. Thermal pollution is more common near

1. Tropical regions
2. Temperate regions.
3. Hot water springs
4. Coal based power plants

50. Tissue culture is a good technique to

1. Eliminate virus
2. Improve yield of crops
3. Cross two varieties
4. Rapidly increase the size of a trees by strengthening the stem

51. Urea is a source of

1. Potassium
2. All of the above
3. Phosphorous
4. Nitrogen

52. Water blooms are formed by

1. Water hyacinth
2. Planktonic algae.
3. Lemna
4. Hydrilla

53. Water logging of soil makes it physiologically dry because

1. both a and b
2. none of these
3. This condition does not allow the capillary force to work
4. this condition does not allow oxygen to enter the soil

54. What is the area in floriculture (in 1000 hectare) in India

1. 100 - 120
2. None of these
3. 40 - 50
4. 60 - 80

55. Which gas of the atmosphere holds up ultraviolet rays ?

1. N2
2. CO2.
3. O2
4. O2

56. Which is not a green house gas?

1. CO
2. H2
3. CFC
4. CH4

57. Which is not applicable to vegetatively propagated plants

1. To conserve a plant
2. To get a new type of plant
3. To get true to type plants
4. To protect an elite quality

58. Which one is green manure

1. Oat
2. Maize
3. Sesbania
4. Rice

59. Which one is the major component of Bordeaux mixture

1. Calcium chloride
2. Magnesium sulphate
3. Copper sulphate
4. Sodium chloride

60. Which one of the following is natural insecticide

1. both a and b
2. None of these
3. Pyrethrum
4. Nicotine