Correct option (a) Commelina
Explanation
Commelina benghalensis bears aerial, chasmogamous (stigma and anthers exposed to pollinating agents), insect pollinated flowers. Cleistogamous flowers are **** flowers which never open, i.e. always remain closed to each other. When anthers dehisce in the flower buds, pollen grains come in contact with the stigma of the same flower, i.e. autogamy occurs. So, these flowers produce assured seed set, even in the absence of pollinators.
