Please tell what is the diploid number of chromosomes shown in them, it would be helpful if you provide the reason as well

Dear student,
Please find below the answer:

The diagrammatic sketches A, B and C are of Metaphase. 
The metaphase of the cell division cycle is characterised by the alignment of all chromosomes at the equator in such a way that one chromatid of each chromosome is connected by its kinetochore to spindle fibres from one pole and its sister chromatid is connected by its kinetochore to spindle fibres from the opposite pole. This plane of alignment of chromosomes at the metaphase is termed as the metaphase plate.

At this stage, the ploidy will be 2n only and no. of chromosomes lined up will be 6 per cell.

Hope this clears your doubt.
Regards. 
 

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