THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Auxins are produced in the apex of stem and root tips and they promote apical elongation of stem along with inhibiting growth of axillary buds.

Detailed explanation-2: -Auxins are produced in and released from cells at the tip of plant stems and roots, as these are often the areas of the plant where most cell elongation, and therefore growth, is required.

Detailed explanation-3: -Auxin is a prominent plant hormone which has several functions in plants. It is usually present at the growing tips like shoot or root tips. They are transported primarily toward the roots.