Question

difference between placentation and astevation in plants in atleast 250 words

Answer 1

(a) Aestivation

The term ‘aestivation’ refers to the mode in which sepals or petals are arranged in a floral bud with respect to other floral members. There are four types of aestivation in plants i.e., valvate, twisted, imbricate, and vexillary.

(b) Placentation

The term ‘placentation’ refers to the arrangement of ovules within the ovary of a flower. It is primarily of five types, namely marginal, basal, parietal, axile, and free central.

So basically,

aestivation: spending the summer in one place, a type of hibernation is known as aestivation 
Placentation: the arrangement of placentas and ovules in the plant over
or
the development of placenta and attachment of foetus to the uterus during pregnancy is known as placentation.

Hope this helps!