The terms $Xenia$ and $Metaxenia$ are related to:

Give the differences between Microsporangium and Megasporangium.

The chances of hereditary and evolutionary changes are higher in species that reproduce through:

Differentiate between microsporogenesis and megasporogenesis. Which type of cell division occurs during these events? Name the structures formed at the end of these two events.

Select the correct option for the following statements:
$(i)$ In the embryo sac of angiosperms,the synergids and antipodals degenerate / do not degenerate after fertilization.
$(ii)$ In the leaves of dicotyledonous plants,parallel / reticulate venation is observed.

Who worked on embryological aspects and popularized the use of embryological characters in taxonomy?