Anisogamous means both gametes are

Define:
$(a)$ Juvenile phase,
$(b)$ Reproductive phase,
$(c)$ Senescent phase.

Bamboo plants flower only once in their lifetime, generally after $50-100$ years, produce a large number of fruits, and then die. Similarly, $Strobilanthus$ $kunthiana$ (Neelakuranji) flowers once in how many years (in $years$)?

Select the incorrect option regarding sexual reproduction.

What is the importance of sexual reproduction?

Give a scientific reason: Reproduction ensures the continuity of generations and helps in creating genetic variation.