Which of the following is not an influence of auxin?

The movement of a sunflower towards the direction of the sun is known as:

Natural and synthetic auxins $(IAA, NAA, IBA, 2,4-D)$ have been used extensively in:

The pineapple,which under natural conditions is difficult to blossom,has been made to produce fruits throughout the year by the application of:

Label the diagram.
$(A)$ This is which part of a dicotyledonous plant?
$(B)$ If we remove part $1$ from the plant,what will happen?

Assertion : Auxins help to prevent fruit and leaf drop at early stages.
Reason : Auxins promote the abscission of older mature leaves and fruits.