Question

Ringing experiments are performed to demonstrate

• A. Ascent of sap through both phloem and xylem.
• B. The ascent of sap through phloem and xylem parenchyma.
• C. The ascent sap through cortical cells.
• D. Ascent of sap through xylem.

Answer 1

The correct option is D Ascent of sap through xylem.

In ringing experiment the bark of a tree is removed at a height above the soil surface as a ring. This leads to accumulation of sugars just above the ring of bark removal because sugars are transported through phloem. The ascent of sap which occurs through xylem continues normally because xylem is not part of the bark and bark consists of secondary phloem along with several other tissues.The experiment clearly demonstrates the function of xylem.

Thus, the correct answer is option D.