Which of the following statements is incorrect?
$(i)$ Bamboo species flower only once in their lifetime,generally after $50-100$ years,produce a large number of fruits,and die.
$(ii)$ In animals,the juvenile phase is followed by morphological and physiological changes prior to active reproductive behaviour.
$(iii)$ The reproductive phase is of the same duration in all organisms.
$(iv)$ The juvenile phase is the period of growth between the birth of an individual until it reaches reproductive maturity.

• A
  Only $(i)$
• B
  Only $(ii)$
• C
  Only $(iii)$
• D
  Only $(iv)$