Q. Anthesis is a phenomenon, which refers to :

Q. Anthesis is a phenomenon, which refers to :

(a) Reception of pollen by stigma

(b) Formation of pollen

(c) Development of anther

(d) Opening of flower bud

Solution:

Correct option: D 
Anthesis is the flowering period in which flower bud opens and become functional. It includes an extension of style, maturation of stamen and colour change. Thus, the correct answer is option D.