Perianth is the collective term used for calyx and corolla of a flower. When the perianth is indistinguishable into calyx and corolla, it is termed as tepals.
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The correct option is A True The non-essential whorls (sepals and petals) are collectively called perianth. In some cases, the perianth is indistinguishable (i.e the calyx and corolla are not distinct) and are called tepals.