'Frailty' means the condition of being weak and delicate. So, 'strength' would be its correct antonym.
CTET Solved Paper MCQ - UPTET December 2016
Didactic poetry aims at conveying a clear moral or message to its readers in order to inspire them.
Munni and Chunni, the subjects, are joined by 'either', 'or' so, the verb 'has' would agree with subject Chunni which is nearest to it.
Effect is wrongly used. 'Affect' meaning 'to influence or make a difference to something' would be used in its place
Poetry teaching should be basically a means of giving joy or aesthetic pleasure to students to cultivate the sense of beauty in language.

