Question

which are the essential and non essential whorls of a flower ?

Answer 1

the whorls of the flower which r directly necessary for reproduction r called the essential whorls of a flower .
the anthers n stigmas r referred to as the essential whorls.

the whorls of the flower which r not directly necessary for reproduction r called the non essential whorls of a flower. their presence or absence doesnt affect the reproduction.
the sepals n petals r referred to as the non essential whorls.

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Answer 2

The stamens and pistils usually occur in the same flower. These are essential whorls. A flower bearing both the essential whorls is bisexual. Sometimes a flower has only the stamens or only the pistils, in which case it is referred to as a unisexual flower (i.e. the flower bears only one of the essential organs).

The calyx and the corolla are referred to as the non-essential whorls , since they are not responsible for the formation of gametes and seeds. This formation can occur in the absence of the outer whorls.

A flower in which all four whorls are present is said to be a complete flower. If any one of the non-essential whorls is not present, the flower is incomplete
 
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