Which one of the following generates new genetic combinations leading to variation?

Which of the following statements is incorrect ?
$(i)$ Bamboo species flower only once in their life time, generally after $50-100$ years and produce 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 same duration in all organisms.
$(iv)$ Juvenile phase is the period of growth between the birth of an individual till it reaches reproductive maturity.

What is the chromosome number in meiocyte of potato ?

Archegoniophore and antheridiophore are part of reproductive organ of………

Calcium deficiency results in the formation of an egg with