Which of the four most abundant element in most plants (C, H, O and N), dows a terrestrial green plant procure mainly through its roots from the soil?A. H and OB. H and NC. C and OD. O and N

Which of the four most abundant element in most plants (C, H, O and N)

1.	Which of the four most abundant element in most plants (C, H, O and N), dows a terrestrial green plant procure mainly through its roots from the soil?A. H and OB. H and NC. C and OD. O and N
Answer» Correct Answer - B Hydrogen (H) is mainly obtained from soil water by roots. Oxygen (O) is either derived from the wair or from the water. Carbon (C) is derived from atmosphere as `CO_(2)`. 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 `N_(2)` nitrates `(NO_(3)^(-))`, ammonium ion `(NH_(4)^(+))`, etc. These nitrogenous compounds enter plants as nutrietns through the roots and are assimilated as organic nitrogen.

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Which of the four most abundant element in most plants (C, H, O and N), dows a terrestrial green plant procure mainly through its roots from the soil?A. H and OB. H and NC. C and OD. O and N

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