How many meiotic divisions are required to produce $101$ female gametophytes (embryo sacs) in an angiosperm?

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.

By deep freezing,it is possible to preserve embryos at which stage?

Select the incorrect statement from the following:

Thymus possesses two types of plants,female flowered and hermaphrodite flowered. The condition is called

Which of the following represents the correct sequence of phases in the life cycle of wheat? [where $J$ - Juvenile phase,$R$ - Reproductive phase,$I$ - Interflowering period,$G$ - Gap phase,$S$ - Senescence,$V$ - Vegetative phase]