Share Trading & Presumptive Taxation

Yes , You can do so by disclosing 8% (Turnover through Cash mode) / 6 % (Turnover through Banking channel) of Turnover.

CBDT has issued a circular 6/2016 dated 29.02.2016 wherein it has provided an option to the taxpayers that they would have a choice to treat and reflect their income from sale of shares as Income from business or Income from Capital gains.
Assesses will not be allowed to change his stand again that means suppose in one year the assessee has opted to show such income as business income then in subsequent years also he should show such income in such head only.