The Bird of Paradise flower is:

Units of............ are united or free.

$A$ : There are two alae in $Pisum$ $sativum$ flower.
$R$ : Both alae are covered by the largest petal.

Identify the correct terms for the following analogy-based questions:
$(i)$ Sunflower : Alternate phyllotaxy :: Alstonia : ...........
$(ii)$ Datura : Actinomorphic flower :: Bean : ............

Commercially useful surface fibers are obtained from which of the following?

The series of Gamopetalae containing $4$ cohorts and many orders is: