In angiosperms,the oospore on development produces

In the given diagram, identify and label the parts indicated by the lines.

Which of the following plant organs is diploid?

In angiosperms,the embryo is developed at . . . . . . of the embryo sac.

When the inner half of the oospore after the first division develops into an embryo and the outer half develops into a suspensor,this type of development is called:

$A$: Eight cells of the octant stage in dicot embryogeny are formed by $2$ vertical and $1$ transverse division in the embryonal cell.
$R$: These cells are arranged in epibasal and hypobasal tiers.