Horizontally oriented ovules are called

An angiospermic plant is having $24$ chromosomes in its leaf cells. The number of chromosomes present in synergid, pollen grain, nucellus & endosperm will be respectively

Identify the labelling of given diagrams

In angiosperms embryosac is developed from

Mature Polygonum type embryo sac has got

What does the filiform apparatus do at the entrance into ovule?