Q2 of 39 Page 63

Which one of the following statements can best explain the term critical concentration of an essential element?

The amount or concentration of the essential elements like Calcium,Magnesium,Zinc and Iron etc. below which the plant growth is retarded is known as critical concentration of an essential element.

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1

Which one of the following roles is not characteristic of an essential element?

 3

Deficiency symptoms of an element tend to appear first in young leaves. It indicates that the element is relatively immobile. Which one of the following elemental deficiency would show such symptoms?

 4

Which one of the following symptoms is not due to manganese toxicity in plants?

 5

Reaction carried out by N2 fixing microbes include

a. 2NH3 + 3O2 2NO2– + 2H+ + 2H2O (i)


b. 2NO2- + O2 2NO3- (ii)


Which of the following statements about these equations is not true