Pollen kit material is secreted by

If root of flowering plant has $24$ chromosomes then its gamete has how many chromosomes?

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 $   ……….

Because of it pollen grains are well preserved as fossils

Microspore tetrads forms due to meiotic division occurs in……