Transport in Plants Questions

The translocation of organic solutes in sieve tube members is supported by:

Root pressure is usually developed due to:

Roots play insignificant role in absorption of water in:

A column of water within xylem vessels of tall trees does not break under its weight because of:

Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of following options:

A few drops of sap were collected by cutting across a plant stem. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?