In organic farming:

• intercropping is not used
• manures are not used
• biofertilizers are not used
• chemical fertilizers are not used
Correct Option: D  [ chemical fertilizers are not used ]

Remark:

Which one of the following is a chemical change ?

• Burning of candle
• Melting of wax
• Vapourisation of water
• Magnetising of Iron
Correct Option: A  [ Burning of candle ]

Remark:

The gas which destroys ozone layer is:

• Oxygen
• Argon
• Chloroflurocarbon
• Hydrogen
Correct Option: C  [ Chloroflurocarbon ]

Remark:

Ocean thermal energy is due to:

• tides in the ocean
• pressure difference at different levels in the ocean
• temperature difference at different levels in the ocean
• energy stored by waves in the ocean
Correct Option: C  [ temperature difference at different levels in the ocean ]

Remark:

What is common in AIDS, hepatitis and typhoid fever ?

• All are bacterial disease
• All are water borne diseases
• All are viral disease
• All are spread by human beings
Correct Option: D  [ All are spread by human beings ]

Remark:

Seismology is the science of :

• Atmosphere
• Earthquake
• Fossil
• Silkworm breeding
Correct Option: B  [ Earthquake ]

Remark:

Which one of the following organs is the main respiratory organ of whale?

• Integuments
• Gills
• Lungs
• Trachea
Correct Option: C  [ Lungs ]

Remark:

The nearest planet to the sun is:

• Venus
• Mars
• Mercury
• Jupiter
Correct Option: C  [ Mercury ]

Remark:

The salinity of the sea water is:

• 1.5 %
• 2.5 %
• 3.5 %
• 4.5 %
Correct Option: C  [ 3.5 % ]

Remark:

Oxygen is transported to the cells of the human body through:

• Red Blood cells
• White Blood cells
• Hormones
• Enzymes
Correct Option: A  [ Red Blood cells ]

Remark: