What would be expected to happen if: (a) GA3 is applied to rice seedlings (b) dividing cells stop differentiating (c) a rotten fruit gets mixed with unripe fruits (d) you forget to add cytokinin to the culture medium.

(a) GA₃ applied to rice seedlings

Promotes stem (internode) elongation, resulting in taller seedlings with longer shoots; also enhances germination and vigor

(b) Dividing cells stop differentiating

Undifferentiated cells accumulate as callus; organs like roots, stems, leaves fail to form

Plant remains structureless and nonfunctional, likely leading to stunted growth or death

(c) A rotten fruit mixed with unripe fruits

High ethylene emitted from the rotten fruit accelerates ripening in the unripe fruits

This hastened ripening may lead to uniform maturation, though sometimes at the cost of quality

(d) Cytokinin omitted from culture medium

Without cytokinin, cell division, shoot initiation, and differentiation are severely impaired

Plant tissues may form callus under auxin alone but will not progress to form organized shoots 

Summary Table