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Which of the four most abundant elements in most plants (C, H, O and N), does a terrestrial green plant procure mainly through its roots from the soil?
  • a)
    H and O
  • b)
    H and N
  • c)
    C and O
  • d)
    O and N
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Which of the four most abundant elements in most plants (C, H, O and N...
Hydrogen (H) is mainly obtained from soil water by roots. Oxygen (O) is either derived from the air or from the water. Carbon (C) is derived from atmosphere as CO2. The plants are unable to use atmospheric nitrogen. It is inert and plants cannot make use of it directly. By the process of fixation of atmospheric N2, plants obtain it from soil in the form of nitrites (NO2), nitrates (NO3), ammonium ion (NH+4), etc. These nitrogenous compounds enter plants as nutrients through the roots and are assimilated as organic nitrogen.
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Which of the four most abundant elements in most plants (C, H, O and N), does a terrestrial green plant procure mainly through its roots from the soil?a)H and Ob)H and Nc)C and Od)O and NCorrect answer is option 'B'. Can you explain this answer?
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