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Natural Resources Test - 18

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Natural Resources Test - 18
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The largest reservior of nitrogen is
    Solution
    The largest reservior of nitrogen is the air or the atmosphere as it contains 78% of it.
  • Question 2
    1 / -0
    Organisms require water for
    Solution
    All cellular processes take place in a water medium. All the reactions that take place within our body and within the cells occur between substances that are dissolved in water. Substances are also transported from one part of the body to the other in a dissolved form. Hence, organisms need to maintain the level of water within their bodies in order to stay alive. Terrestrial life-forms require fresh water for this because their bodies cannot tolerate or get rid of the high amounts of dissolved salts in saline water. Thus, water sources need to be easily accessible for animals and plants to survive on land.
    Hence the correct option is D.
  • Question 3
    1 / -0
    Which of the following process in the water cycle takes place due to rapid cooling of air?
    Solution
    Condensation is the change of water from its gaseous form (water vapor) into liquid water. Condensation generally occurs in the atmosphere when warm air rises, cools and looses its capacity to hold water vapor. As a result, excess water vapor condenses to form cloud droplets.
  • Question 4
    1 / -0
    The process by which water change into water vapour is called as
    Solution
    Transpiration is the loss of water by stomata present in the leaves of plants.
    Evaporation is the process by which water is converted into water vapour.
    Condensation is the cooling down of water vapour to form liquid water.
    Precipitation is falling down of water from clouds in the sky in form of rain.
    The correct option is B.
  • Question 5
    1 / -0
    Carbon dioxide is called greenhouse gas because it is
    Solution
    An increase in the percentage of such gases in the atmosphere that would cause the average temperatures to increase world-wide and this is called the greenhouse effect. Carbon dioxide is one of the greenhouse gases. It is transparent to sunlight but traps the heat produced and keeps the surface of earth warm.
    The correct option is C.
  • Question 6
    1 / -0
    Which of the following is true regarding greenhouse effect?
    Solution

    The primary greenhouse gases in Earth's atmosphere are water vapour, carbon dioxide $$(CO_2)$$, nitrous oxide $$(N_2O)$$, methane $$(CH_4)$$ and ozone $$(O_3)$$.

    So, the correct answer is option 'D'.

  • Question 7
    1 / -0
    Name the process of nitrate reduction that may ultimately produce molecular nitrogen (N$$_2$$) through a series of intermediate gaseous nitrogen oxide products.
    Solution
    The process of conversion of nitrates and ammonia into molecular nitrogen gas is known as denitrification.
    So, the correct answer is option B.
  • Question 8
    1 / -0
    Legume plants are important because they :
    Solution
    • Legume plants have root nodules, which harbor nitrogen-fixing bacteria.
    • These bacteria convert atmospheric nitrogen (which cannot be used by plants) into biologically useful forms like nitrates and nitrites which can be taken up and used to make the required molecules.

    Thus, the correct option is A.
  • Question 9
    1 / -0
    Formation of ozone hole is maximum over:
    Solution
    • The thickness of ozone over the poles changes with the seasons, being the lowest in polar spring and maximum in polar autumn. 
    • The ozone hole is formed each year when there is a sharp decline (currently up to 60%) in the total ozone over most of Antarctica for a period of about three months (September-November) during spring in the Southern Hemisphere. 
    • This depletion of ozone is due to the action of sunlight over pollutants, which release chemicals like chlorine, that destroy ozone.
    • Thus, the correct answer is option B.
  • Question 10
    1 / -0
    The presence of which of the following gases in air checks the ultraviolet rays from sunlight?
    Solution

    At the higher levels of the atmosphere, ozone(O$$_3$$) performs an essential function. It shields the surface of the Earth from ultraviolet (UV) radiation from the sun. This radiation is highly damaging to organisms, for example, it is known to cause skin cancer in human beings. 

    Hence, option D is correct.

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