What protects the mature embryo in a seed?

In which plant is the perisperm found?

Describe the post-fertilisation changes in a flower.

In oviparous individuals,the development of the zygote takes place:

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

How many years old is the viable seed of date palm $(Phoenix dactylifera)$ discovered during the archaeological excavation at King Herod's palace near the Dead Sea?