Sexual Reproduction in Flowering Plants

Double fertilisation (one male gamete fuses with the egg and the other with the polar nuclei) occurs in all angiosperms; it is a unique and universal feature of this group.
Vessels are absent in some primitive angiosperms (e.g. Wintera, Trochodendron).
Secondary growth is absent in most monocots.
Some angiosperms are not autotrophic, e.g. the parasite Cuscuta and saprophyte Monotropa.
So double fertilisation is without exception in angiosperms.

In an anatropous ovule (the most common type), the body of the ovule is completely inverted (turned through $180^\circ$) on its stalk, the funicle.
As a result the micropyle lies close to the funicle and the hilum and points downward, towards the placenta, while the chalaza is at the top.
[add image: anatropous ovule with funicle, hilum and micropyle facing downward and chalaza at the top]
So the micropyle of an anatropous ovule faces downward.