Differentiate between gametogenesis and embryogenesis.

............ is responsible for variation.

Write a short note on sexuality in organisms.

What is the importance of sexual reproduction?

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 $years$)?

In which organisms does the zygote develop a thick wall that is resistant to desiccation and damage?