High fluoride concentration in plants typically results in necrosis or chlorosis in:

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

Absence of $Mg^{++}$ ions from plant tissue results in

Which of the following mineral deficiencies may cause a reduction in the growth of leaves?

Name at least five different deficiency symptoms in plants. Describe them and correlate them with the concerned mineral deficiency.

'Petiole crack' is caused by the deficiency of