Yellowing of tea leaves occurs due to the deficiency of:

Necrosis,or death of tissue,particularly leaf tissue,is due to the deficiency of ........

Which of the following elements does not remobilize in plants?

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 deficiencies would show such symptoms?

Deficiency of . . . . . . causes death of shoot and root tips in plants.

$A$ lower concentration of a mineral element causes $...........$ and a higher concentration causes $.............$.