Petals and Sepals are the bisexual flowers that are not 'directly involved in reproduction'.  

Explanation:

• In other words it can be said that Calyx and Corolla is the another name of the sepals and petals.
• They are not directly involved in the reproduction process. These petals and sepals help to attract the insects and protect the embryo.  
• These parts of the flowers also help to protect the bud from any outer injuries at the time of the development of the bud.

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