In which phase of meiosis does the chromosome number become halved?

What is the process called in which the number of chromosomes in the nucleus is reduced to half during cell division?

In which phase of meiosis nuclear membrane and nucleolus are reformed?

In the given figure,what type of cell division is observed in the cell labeled $R$?

Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres.

Identify the correct sequence of events during Prophase $I$ of meiosis :
$(a)$ Synapsis of homologous chromosomes
$(b)$ Chromosomes become gradually visible under microscope
$(c)$ Crossing over between non-sister chromatids of homologous chromosomes
$(d)$ Terminalisation of chiasmata
$(e)$ Dissolution of synaptonemal complex
Choose the correct answer from the options given below :