Chasmogamous flowers are -

The correct answer is Option (2) → Similar to flowers of other species with exposed anthers and stigma 

Cleistogamous flowers are those that self-pollinate without opening. Some plants such as Viola (common pansy), Oxalis, and Commelina produce two types of flowers – chasmogamous flowers which are similar to flowers of other species with exposed anthers and stigma, and cleistogamous flowers which do not open at all.