Which of the following is surrounded by a carbohydrate-rich wall?

The cells of the sporogenous tissue undergo meiotic division to form microspore tetrads. What would be the ploidy of the cells of the sporogenous tissue?

Which of the following statements about sporopollenin is false?

$P -$ This cell is big,has abundant food reserve and a large irregularly shaped nucleus.
$Q -$ This cell is small and floats in the cytoplasm of the vegetative cell. It is a spindle-shaped cell with dense cytoplasm and a nucleus.
$\quad\quad \quad P \quad \quad Q$

$A$ schematic illustration of the pollen grain is called

Because of which substance are pollen grains well preserved as fossils?