Which of the following is true for auxin?

(i) They help to prevent fruit and leaf drop at early stages but promote the abscission of older mature leaves and fruits.

(ii) Auxins shows apical dominance and it applied in tea plantations, hedge-making.

(iii) NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic acid) are synthetic auxins.

(iv) Auxins also induce parthenocarpy e.g., in tomatoes.

(v) 2, 4-D, widely used dicotyledonous herbicides.

(vi) 2, 4-D is used to prepare weed-free lawns by gardeners.

(vii) Auxin also controls xylem differentiation and helps in cell division.