$IBA$ is a

Apical dominance is caused by which of the following?

Auxin $-B$ was first isolated by

In tobacco,enzymatic activity can be retarded by

Provide the full names of the following plant growth regulators:
$(1)$ $IBA$
$(2)$ $2,4-D$

If one can induce parthenocarpy through the application of growth substances,which fruits would you select to induce parthenocarpy and why?