Q. Mature differentiated cells revert to meristematic activity to form callus by :

Q. Mature differentiated cells revert to meristematic activity to form callus by :

(a) Differentiation

(b) Cytodifferentiation

(c) Redifferentiation

(d) Dedifferentiation

Solution : Correct option : D In callus culture, cell division in explant (differentiated mass of mature cells) forms and callus. Callus is an irregular unorganized and undifferentiated mass of actively dividing cells. The process is called dedifferentiation .So the correct option is ‘Dedifferentiation’.