In the Fabaceae (Papilionoideae) family,the 5 | vedclass

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(A) The $Fabaceae$ family exhibits a characteristic aestivation known as vexillary or papilionaceous aestivation.In this arrangement,the largest poste

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Respectively $1, 2, 2$

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(A) The $Fabaceae$ family exhibits a characteristic aestivation known as vexillary or papilionaceous aestivation.In this arrangement,the largest posterior petal is called the standard or vexillum $(1)$,the two lateral petals are called wings or alae $(2)$,and the two smallest anterior petals are fused to form the keel or carina $(2)$.Therefore,the arrangement of petals is $1$ standard,$2$ wings,and $2$ keel petals.Thus,the correct sequence is $1, 2, 2$.

In the $Fabaceae$ (Papilionoideae) family,the $5$ petals form a distinct arrangement involving $3$ different types of elements: the standard (vexillum),wings (alae),and keel (carina). What is the number of these elements respectively?

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