In which seeds remnants of nucleus are persistent ? This residual persistent nucleus is the perisperm

Choose the correct option from the following
$I$. Dehydration and dormancy of mature seed are crucial for seed storage.
$II$. Seed of Lupinus arcticus is the oldest one which germinated after $2000 \;year$.
$III$. Orchid seed is one of largest seed in plant Kingdom.
$IV$. Seeds of parasitic plants Orobanche and Striga are tiny seeds.

What is represented by $'X'$ and $'Y'$ in the given diagram?

Examine the figure given below and select the right option giving all the four parts $a, b, c$ and $d$. Correctly identify.

$a\quad\; b\quad\; c \quad\;d$