How many microspore mother cells will give rise to $256$ microspores after reduction division

Generally in the wall of the anther lobes how many middle layers are formed

Germination of pollen grain on the stigma is

Complete the following flow chart

Pollen Mother cell $\to $ Pollen tetrad $\to $ Pollen grain $\to $ Vegetative cell

Pollen Mother cell $\to $ Pollen tetrad $\to $ Pollen grain $\to $   ……….