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91) Which of the following one of the following is not transmitted via blood transfusion -
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92) The hydrophilic nature of DNA is due to the presence of
Explanation :
a number of hydrogen bonds.The phosphate groups on DNA are ionic & charged. Charged molecules attract water & are hydrophilic. Each phosphate group on the DNA backbone is one unit of negative charge (-1). DNA has two hydrophilic polar external backbones made of sugars & phosphate groups joined by ester bonds.
93) Blood group AB has
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94) Under the electron microscope, you observe a cell with three different types of large organelles, each bounded by two membranes. The cell is most likely
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95) Which of the following layers of the Earth's atmosphere provide ideal flying conditions for Jet aircraft?
Explanation :
The stratosphere is said to be ideal for flying jet aircraft. This is because this layer is rich in ozone which reduces fuel consumption, the temperature is constant and ideal for aircraft engine efficiency, this layer is out of the firing range of anti-aircraft guns and of the absence of clouds and other weather phenomena.
96) Which of the following places are favourably influenced by the Trade winds? I. West Indies II. Brazil III. Mexico IV. Madagascar
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97) In the northern hemisphere, the wind blowing from the Horse latitudes to the Doldrums is called ________
Explanation :
In the northern hemisphere, the wind blowing from the Horse latitudes to the Doldrums is called Trade wind. Trade wind blow out from the Subtropical High Pressure belts. In the northern hemisphere, they blow towards the equatorial low and called North East Trade Winds. In the Southern hemisphere they blow towards the equatorial low and become the South East Trade winds.
98) The dense mass of small water drops on smoke particles in the lower layers of the atmosphere is ________
Explanation :
The dense mass of small water drops on smoke particles in the lower layers of the atmosphere is Smog. Smog is a kind of air pollution, originally named for the mixture of smoke and fog in the air. Classic smog results from large amounts of coal burning in an area and is caused by a mixture of smoke and sulfur dioxide.
99) In which layer, temperature increases dramatically?
Explanation :
As Ionosphere is one of the upper most layers, the solar and cosmic radiations heat it up rapidly, the gaseous material available here is in ionic state. Hence temperature increases rapidly.
100) What is the major role of a greenhouse gas that contributes to temperature rise of the Earth's surface?
Explanation :
Solar energy heats the earth’s surface. But the energy does not stay bound up in the earth’s environment forever. Instead, as the earth warms, it emits thermal radiation. This thermal radiation, which is largely in the form of long-wave infrared rays, eventually finds its way out into space, leaving the earth and allowing it to cool. However, not all of the infrared rays pass into space. Some of the infrared rays are absorbed by greenhouse gases and warm the atmosphere. So the amount of greenhouse gases in the atmosphere is directly related to the temperature of the atmosphere.
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