Multiple choice Ringing experiment to show that xylem is the channel of ascent of sap was conducted by Sir J.C. Bose Malphigi, Stephan Hales and Hartig Godlewski Dixon and Jolley Reveal answer Fill a bubble to check yourself B Correct answer Explanation Malphigi in 1672, Stephan Hales in 1727, Hartig conducted the ringing experiment to show that xylem is the mode of ascent of sap.