Match the Column I with Column II .

a-4, b-3, c-2, d-1

The correct answer is Option (4): a-4, b-3, c-2, d-1

 Karyokinesis is a step in cell division where the nucleus divides to form two daughter nuclei. This process, usually followed by cytokinesis.

The beginning of diplotene is recognised by the dissolution of the synaptonemal complex and the tendency of the recombined homologous chromosomes of the bivalents to separate from each other except at the sites of crossovers. These X-shaped structures, are called chiasmata.

At the beginning of the final stage of karyokinesis, i.e., telophase, the chromosomes that have reached their respective poles decondense and lose their individuality.This is the stage which shows the following key events: Chromosomes cluster at opposite spindle poles and their identity is lost as discrete elements.  Nuclear envelope develops around the chromosome clusters at each pole forming two daughter nuclei. Nucleolus, golgi complex and ER reform.

In some organisms karyokinesis is not followed by cytokinesis as a result of which multinucleate condition arises leading to the formation of syncytium (e.g., liquid endosperm in coconut).