Tag: evs - i

Questions Related to evs - i

Which of the following is/are caused due to deforestation?

evs - i the environment and us pollution of soil degradation of land damaging the forests

  1. Soil erosion

  2. Depletion of water in the catchment areas

  3. Global warming

  4. All of these

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Correct Option: D
Explanation:

Deforestation is the process of cutting or removal of forest to fulfill the need of the population. It has many negative impacts on the environment such as loss of species, soil erosion and reduces rainfall. The tree absorbs water from soil for photosynthesis and produces water vapor that is released into the atmosphere which in turn causes rainfall. If there will be less number of the tree then rainfall will also decrease. Plants absorb carbon dioxide (greenhouse gas) for photosynthesis and releases oxygen. Greenhouse gases absorbs the solar energy and increase the earth's temperature is called as global warming. Thus, the correct answer is option D.

Growing forest where there were no forest before is known as :

evs - i the environment and us pollution of soil degradation of land damaging the forests

  1. Replantation

  2. Afforestation

  3. Thuming

  4. Desertification

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Correct Option: B

If we uncover half of the forest, covering of the earth, what crisis will be produced at most and at first?

evs - i the environment and us pollution of soil degradation of land damaging the forests

  1. Some species will be extincted

  2. Population and ecological imbalance will rise up

  3. Energy crisis will occur

  4. Rest half forests will maintain this imbalance

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Correct Option: A
Explanation:

Forest is the home of many of distinct species and even undiscovered species if the forest is uncovered many of the species lost their natural habitat and become extinct which further leads to the following problem like:

  • Rise in population and ecological balance- The number of producer decreases, the dependent consumers will die out of starvation. This lead to rise in ecological imbalance.
  • Energy crises- Due to the decrease in the number of producers.
  • Imbalance in the forest- As the number of producer decreases, the food chain gets disturbed.
So the correct option is 'Some species will be extinct'.

The first life had appeared about 

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

  1. 4.8 billion years ago

  2. 3.8 billion years ago

  3. 1.4 billion years ago

  4. 2 billion years ago

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Correct Option: B
Explanation:

About 3.8 billion years ago after the formation of earth, single celled prokaryotic cells (bacteria) appeared. It is supposed that the multicellular living organisms evolved from them. So, the correct option is 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. Ionosphere

  2. Stratosphere

  3. Thermosphere

  4. Troposphere

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Correct Option: B
Explanation:

The Ozone layer is located in the stratosphere in a region that is 10 to 50 km above the Earth.

So, the correct option is 'Stratosphere'.

Transitional layer between stratosphere and mesosphere is ______________.

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. Lithosphere

  3. Stratopause

  4. Tropopause

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Correct Option: C

Earth is protected from ultra-violet radiations by means of.

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

  1. Ozone layer

  2. Nitrogen

  3. Oxygen

  4. Carbon dioxide

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Correct Option: A
Explanation:

The ozone layer filters out most of the sun's harmful ultraviolet radiation and is thereby significant for the life on Earth.

So, the correct option is 'Ozone layer'.

Thickness of ozone in column of air from ground to top of atmosphere is measured in terms of

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

  1. Decibel units

  2. Pascal units

  3. Svedberg units

  4. Dobson units

  5. Angstrom units

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Correct Option: D
Explanation:
A. Decibel (dB) is the unit to measure the intensity of sound.
B. Pascal (Pa) is the unit measure pressure.
C. Svedberg (S) is a non-metric unit used to express the sedimentation coefficient of particles. 
D. Dobson unit (DU) is used to measure the thickness of earth's atmosphere.
E. Angstrom (Å) is a unit of length used to express the size of atoms, molecules etc.
Hence, thickness of ozone in column of air from ground to top of atmosphere is measured in terms of Dobson units.
So, the correct answer is 'Dobson units'.

Concentration of ozone in troposphere is

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

  1. 0.05 ppm

  2. 0.1 ppm

  3. 1.5 ppm

  4. 10.0 ppm

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Correct Option: A

Zone of atmosphere near the ground is

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. Stratosphere

  3. Mesosphere

  4. Homosphere

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Correct Option: A