Give differences: Accessory whorls and Essential whorls.

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Accessory whorls Essential whorls
$(1)$ The whorls of a flower which are not directly involved in sexual reproduction but assist in the process are called accessory whorls. $(1)$ The whorls of a flower which are directly associated with sexual reproduction are called essential whorls.
$(2)$ Calyx and corolla are accessory whorls. $(2)$ Androecium and Gynoecium are essential whorls.
$(3)$ They provide protection to the reproductive organs and aid in pollination. $(3)$ They are responsible for the production of gametes and fertilization.
$(4)$ They are considered sterile whorls. $(4)$ They are considered fertile whorls.

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