Choose the forms in which most plants absorb nitrogen
(i) Proteins
(ii) Nitrates and Nitrites
(iii) Urea
(iv) Atmospheric nitrogen
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)
Ans.(b)
Nitrogen is essential element to form proteins and it is observed in the form of nitrates, nitrites and urea. Sometimes we add urea in the soil and plants have adopted a lot to overcome nitrogen deficiency, for example, Carnivorous plants.
Hence option (b) is correct.