Botany MCQ Questions and Answers Quiz

61. Ozone hole is caused by

  1. Acetylene
  2. Ethylene
  3. Chlorofluorocarbons
  4. Methane.

62. Ozone layer is found in

  1. Thermosphere
  2. Stratosphere
  3. Mesosphere
  4. Lithosphere.

63. Pesticide responsible for Ozone depletion is

  1. BHC
  2. DDT
  3. Melathion
  4. None of the above.

64. Pollutants released from paddy field is

  1. CO2
  2. CO
  3. H2O2
  4. CH4.

65. Pudding is done to

  1. Reduce percolation of water
  2. Pulverise and levelling soil
  3. Kill weeds
  4. All of the above

66. Role of CFC present in atmosphere is to

  1. Reduction in ozone
  2. Ozone formation
  3. Formation of leg haemoglobin
  4. Enhance chlorophyll formation.

67. Root suckers are

  1. Insects that suck nutrients from the roots of plants
  2. Shoots that arise from roots to form new plant
  3. New plant parts that arise from the branches of fruit trees
  4. Roots of neighboring plants that share water with the another plant

68. Rootex contains

  1. Auxins
  2. ABA
  3. Kinetin
  4. Ethylene

69. Roses can grow successfully if stock and scion are

  1. Of related species
  2. Of different species
  3. Of different groups
  4. Of similar class

70. Seed treatment is done to control

  1. Soil-borne disease
  2. Air-borne disease
  3. Seed-borne disease
  4. None of these

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