If a plant shows a symptom which could develop due to deficiency of more than one nutrient, how would you find out experimentally, the real deficient mineral element?

A bar magnet has no marking to indicater its poles.How would you find out near which end is its north pole located ?

How are the terms 'critical concentration' and 'deficient' different from each other in terms of concentration of an essential element in plants? Can you find the values of 'critical concentration' and 'deficient' for mineral - Fe & Zn.

It is observed that deficiency of a particular element showed its symptoms initially in older leaves and then in younger leaves. How is the aspect of mobility of elements important to horti culture and agriculture?

It is observed that deficiency of a particular element showed its symptoms initially in older leaves and then in younger leaves. Name two elements which are highly mobile and two which are relatively immobile.

Sarita and Ameena decide to paly a game of expressions. They take the variable x and the number 3 and see how many expressions they can make. The condition is that they should use not more than one out of the four number operations and every expression must have x in it. Can you help them? Sarita thinks of (x + 3) Then Ameena comes up with (x - 3) Is (3x+5) allowed? Is (3x + 3) allowed?

Inspite of presence of all the essential elements in the soil the plants sometimes show symptoms of mineral deficiency. Explain.