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Which of the four most abundant element ...

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 O

B

H and N

C

C and O

D

O and N

Text Solution

Verified by Experts

The correct Answer is:
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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