For union between stock and scion in grafting which one is the first to occur ?

Options

A. Formation of callus
B. Production of plasmodesmata
C. Differentiation of new vascular tissues
D. Regeneration of cortex and epidermis

Answer

a

Explanation

In grafting , cambium bearing shoot (scion) of one plant is joined to cambium bearing stump (root system= stock) of related plant through different union like tongue grafting , wedger grafting , etc. the union of scion and undifferentiated mass of actively dividing cells known as callus.