The association between blue-green algae and fungi occures in :

Which one of  the following is not essential element for plants?

Mycorrhiza is a symbiotic relationship between roots of higher plants and

Manganese is required in

Which one of the following elements is not an essential micronutrient for plant growth ?

The translocation of organic solutes in sieve tube members is supported by

Zinc as a nutrient is used by the plants in the form of :-

Enzyme involved in nitrogen assimilation

Gray spots of oat are caused by deficiency of

A plant requires magnesium for