Botany Multiple Choice Questions and Answers

71. Seed treatment with Vitavex is the main controlling method of

1. Loose smut
2. Rust
3. Downy mildew
4. All of these

72. SO2 and NO2 Produce pollution by increasing

1. Alkalinity
2. Acidity
3. Neutrality
4. Buffer action.

73. SO2 pollution causes

1. Plasmolysis
2. Destruction of cell wall
3. Destruction of Golgi bodies
4. Destruction of chlorophyll.

74. Sound becomes hazardous noise pollution at level

1. Above 30 dB
2. Above 80 dB
3. Above 100 dB
4. Above 120 dB.

75. Spot the odd one

1. Borders
2. Hedges
3. Edges
4. Bonsai

76. Spraying of DDT produces pollution of

1. Air
2. Air and Water
3. Air and Soil
4. Air, Water and Soil.

77. The desired varieties of economically useful crops are raised by

1. Vernalization
2. Mutation
3. Natural selection
4. hybridisation

78. The following is not a plant growth regulator

1. Acetic acid
2. Auxins
3. Gibberellins
4. Ethylene

79. The instrument, which is used for sowing of seed with fertilizer together at a time, is

1. Seed drill
2. Dibbler
3. Seed sowing behind plough
4. Ferti-cum Seed drill

80. The main atmospheric layer near the surface of earth is

1. Troposphere
2. Mesosphere
3. Ionosphere
4. Stratosphere