If the margins of sepals or petals overlap one another but not in any particular direction is called.

$A$ : In head inflorescence florets are arranged centrifugally.

$R$ : There always occurs two types of florets in a head.

Define the following terms:

Zygomorphic

Definitions / Explanation :

$(i)$ Phylloclade

$(ii)$ Aestivation

Placenta and pericarp are both edible portions in