In the mineral nutrition studies using hydroponics why is the purification of water and nutrient salts plays important role?

Which of the following statements are true? If false, correct them.

i. Boron deficiency leads to stout axis.

ii. Cell needs every mineral element that is present in it.

iii. Nitrogen is highly immobile in the plants in the form of nutrient element.

iv. The micronutrients are required only in trace quantities so it is very easy to establish their essentiality.

In the formation of a root nodule, what are the steps involved?

In what conditions atmospheric nitrogen can be fixed by Rhizobium and explain their role in Nitrogen-fixation?

How the absorption of minerals occurs in the plants?