What are chasmogamous flowers? Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.

(N/A) Chasmogamous flowers are those flowers which have exposed anthers and stigmata,similar to the flowers of other species,allowing for both self-pollination and cross-pollination.
Cross-pollination cannot occur in cleistogamous flowers.
Reasons:
$1$. Cleistogamous flowers never open at all,meaning the reproductive parts remain enclosed within the flower bud.
$2$. In these flowers,the anthers and stigmata lie very close to each other.
$3$. Due to these structural constraints,only self-pollination (autogamy) is possible,and there is no chance of cross-pollination.