question_answer

Name any two plants which flower only once in their life time after passing through a very long vegetative phase.

OR

How incompatibility acts as a natural barrier in the fusion of gametes?

Answer:

(a) Bamboo species flower only once in their life time, generally after 50-100 years and produce large number of fruits and ultimately die.

(b) Strobilanthus Kunthiana (neelakuranji) flowers once in 12 years. Recently, this plant flowered during September-October 2006.

OR

Incompatibility is the inability of gametes to fuse in genetically similar plants. It is controlled by genes with multiple alleles called S-allele. This phenomenon is also called intraspecific incompatibility. It involves many intricate mechanisms associated with stigmatic tissues and pollen grain.