The above set-up was modified and a band with 250 base pairs was obtained at X.

Question : The above set-up was modified and a band with 250 base pairs was obtained at X.

The correct answer is –

(a) Position of the positive terminal/ end/ anode and the negative terminal/ end/ cathode was inter-changed

(ii) The fragment with least base pairs will get separated faster and
move faster to the anode end.