In which of the following stages are the chromosomes seen as unclear or thread-like?

Crossing over occurs between which of the following?

Match the following stages of meiosis with their characteristic events:
$(a)$ Zygotene $(i)$ Terminalization
$(b)$ Pachytene $(ii)$ Chiasmata
$(c)$ Diplotene $(iii)$ Crossing over
$(d)$ Diakinesis $(iv)$ Synapsis
Select the correct option from the following:

In which phase of meiosis do the sister chromatids separate and move towards opposite poles?

$A$ type of cell division which reduces the chromosome number to half is

Crossing over takes place at a stage between