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(D) Aestivation refers to the mode of arrangement of sepals or petals in a floral bud with respect to the other members of the same whorl.$1$. Valvate

Vedclass · Accepted Answer

Vaxillary aestivation $-$ China rose

Vedclass · Answer

(D) Aestivation refers to the mode of arrangement of sepals or petals in a floral bud with respect to the other members of the same whorl.$1$. Valvate: When sepals or petals in a whorl just touch one another at the margin, without overlapping, as in $Calotropis$.$2$. Twisted: If one margin of the appendage overlaps that of the next one and so on, as in $China rose$, $lady's finger$, and $cotton$.$3$. Imbricate: If the margins of sepals or petals overlap one another but not in any particular direction, as in $Cassia$ and $Gulmohur$.$4$. Vexillary (or Papilionaceous): In pea and bean flowers, there are five petals; the largest (standard) overlaps the two lateral petals (wings), which in turn overlap the two smallest anterior petals (keel). $China rose$ does not show vexillary aestivation; it shows twisted aestivation. Therefore, option $D$ is incorrect.

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