Phototropic curvature is the result of uneven distribution of

One of the commonly used plant growth hormones in tea plantations is

During germination,the stem grows upward and the root grows downward because:

Give scientific reasons: Indole-$3$-acetic acid $(IAA)$ is not the only naturally occurring auxin.

Went $(1928)$ reported that auxin moves from apical to basal end,i.e.,basipetally. The movement is quite fast; in roots,it is about:

Which plant hormone is translocated to other parts of the plant to promote growth?