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The layer of atmosphere which protects the living beings from harmful rays is 

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Mesosphere

  2. Ozonosphere

  3. Thermosphere

  4. Both B and C

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Correct Option: D
Explanation:

Ozone is concentrated mainly in the stratosphere, where it absorbs solar radiation, protecting Earth's living organisms from the ultraviolet light from the sun. UV radiation is harmful to DNA; without the atmosphere's ozone, living organisms could not exist and thrive as they do now. The area in which ozone is concentrated in stratosphere is called the ozonosphere, So the correct answer is 'Both B and C'.

UV radiations absorbed by ozone layer are

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. UV-C

  2. Complete UV-C and a large amount of UV-B

  3. Complete UV-C and complete UV-B

  4. All types

Show answer
Correct Option: B
Explanation:

Most of the sun's UV-B radiation is absorbed by ozone in the stratosphere. UV-C radiation is absorbed by oxygen and ozone in the stratosphere and never reaches the Earth's surface. This is good because the C type rays are the most damaging of all. So the correct answer is 'Complete UV-C and a large amount of UV-B '

Ozone protects biosphere from high energy _____________.

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Infra-red rays

  2. Ultraviolet rays

  3. X-rays

  4. Gamma rays

  5. Cosmic rays

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Correct Option: B

Ozone layer occurs in

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Mesosphere

  2. Thermosphere

  3. Stratosphere

  4. Troposphere

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Correct Option: C

Stratosphere is characterised by ______________.

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Fall in temperature with height

  2. Lack of water vapours and dust particles

  3. Rise in temperature with height

  4. Both B and C

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Correct Option: A

Ozone layer is found in

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Thermosphere

  2. Stratosphere

  3. Mesosphere

  4. Lithosphere

  5. Troposphere

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Correct Option: B

UV radiations in the stratosphere are absorbed by

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Oxygen

  2. Ozone

  3. Sulphur dioxide

  4. Argon

Show answer
Correct Option: B
Explanation:

The stratosphere is the second layer of the atmosphere. At the equator, it is at the height of 20 km and at poles at 7 km. The stratosphere shows the presence of the ozone layer that has formed due to the reaction of the UV rays with the atmosphere. The ozone so formed in capable of absorbing the UV rays emanating from the sun, including the UV-B which is the most harmful. Due to this absorption, the stratosphere shows the stratification of temperature. The temperature is more towards the upper layers of the atmosphere and less towards the troposphere. 

Hence, the correct answer is 'Ozone'

Atmosphere consists of

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Lithosphere + Hydrosphere

  2. Lithosphere + Stratosphere + Hydrosphere

  3. Troposphere + Stratosphere + Ionosphere

  4. None of the above

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Correct Option: C

Tropopause is

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Lower portion of atmosphere

  2. Upper part of troposphere

  3. Middle part of troposphere

  4. Lower part of troposphere

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Correct Option: B
Explanation:

The tropopause is the boundary in the Earth's atmosphere between the troposphere and the stratosphere. Therefore it would serve as the upper part of the troposphere. So the correct answer is ' Upper part of troposphere'. 

Ozone layer is located in

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Troposphere

  2. Hydrosphere

  3. Stratosphere

  4. Lithosphere

Show answer
Correct Option: C
Explanation:

Location in Earth's atmosphere. In the midlatitudes, the peak concentrations of ozone occur at altitudes from 20 to 25 km (about 12 to 16 miles). Most of the remaining ozone occurs in the troposphere, the layer of the atmosphere that extends from Earth's surface up to the stratosphere. The Ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation. The ozone layer contains less than 10 parts per million of ozone, while the average ozone concentration in Earth's atmosphere as a whole is about 0.3 parts per million

So the correct answer is 'Stratosphere'.