Regarding positive gravitropism exhibited by plant roots,
A)it is mediated by auxin as for phototropism.
B)it depends on more rapid elongation of some cells than other cells.
C)gravity causes auxins to accumulate on the lower side of roots.
D)the phenomenon depends upon inhibition of cell elongation of certain root cells by auxins.
E)All of the above are correct.

Question

Quizplus · Accepted Answer

All of the above choices are correct. Positive gravitropism in plant roots is mediated by auxin, which causes more rapid elongation of cells on the upper side of the root, leading to downward curvature towards gravity. Gravity also causes auxin to accumulate on the lower side of roots, further promoting differential cell elongation. Additionally, the phenomenon of positive gravitropism depends upon the inhibition of cell elongation in certain cells by auxins.

Regarding Positive Gravitropism Exhibited by Plant Roots