Meiosis in diploid organisms results in:

1.  production of gametes

2.  reduction in the number of chromosomes

3.  introduction of variation

4.  All of the above

Class 11 pg 167
(d) Meiosis is a reduction division which reduces the chromosomes number to half in gametes. Since, it is a special kind of cell division in which exchange of genetic material takes place that brings about variation in next generations. So all options are characteristic features of meiotic cell division.