Question

Ringing experiment to explain ascent of sap path was first done by

• A. Hartig and Malpighi
• B. Dixon and J. C. Jolly
• C. Godlewski and J. C. Bose
• D. Stephen hales and Boehm

Answer 1

The correct option is A Hartig and Malpighi

Downward translocation of the organic solutes takes place through phloem. This can be proved by the ringing experiment. Ringing experiment was carried by Hartig, Malpighi and Stephen Hales.
They took a branch with leaves immersed in beaker which is filled with water. Now remove all the tissues which are present above the xylem [cortex, cambium and phloem]. Now placed this experiment in a suitable environment for 2 - 3 days. Then they observed that leaves did not wilt. This experiment makes it clear that water moves up only through vessels and tracheids of the xylem.
Ringing [girdling] experiment has been done only in dicotyledons because their vascular bundles lies in a ring. While vascular bundles are scattered in monocotyledons, so that this experiment can not be possible.