Definations / Explanation :
$1.$ Micropyle
$2.$ Chalaza
$(1)$ Integuments encircle the nucellus except at the tip where a small opening called the micropyle is organised.
$(2)$ Opposite the micropylar end, is the chalaza, representing the basal part of the ovule.
Tegmen develops from
Identify the type of ovary in diagram
Single cell which is present in the micropylar region of the nucleus and it develops
The number of mitotic generations required to form a mature embryo sac in most of the flowering plants is