Question

why are petals and sepals referred to as accessory parts of the flower?

Answer 1

petals and sepals referred to as accessory part as it does not help in reproduction
petals helps to attract insects for pollination by the different colors of petals.
whereas sepals help in mechanical support to the flower and keep all of them together.

hope it helps you

Answer 2

Hey mate.....here is your answer↡↡↡↡↡✌

sepals are necessary to protect the flowers in bud condition and it performed the function of photosynthesis.

and petals are necessary to protect the flowers