After fertilization,the outer integument forms:

Tegmen develops from

The aril is the edible part of which of the following?

Why is vivipary an undesirable trait for annual crop plants?

What is a non-albuminous seed?

The seed of $Lupinus \text{ } arcticus$ excavated from Arctic Tundra, germinated and flowered after an estimated record of dormancy of how many years (in $years$)?