Definations / Explanation :
$1.$ chasmogamous
$2.$ Cleistogamous
Some plants such as viola, oxales and commelina produce flowers which are similar to flowers of other specis with exposed anther and stigma
The flowers which do not open at all are called cleistogamous flowers.
Identify the type of flower $A$ and $B$
Insect pollinated flowers are
Even in absence of pollinating agents seed setting is assured in