Based on various pieces of evidence,it is known that the downward movement of food in plants takes place through:

Why is the transport of organic food through phloem bidirectional?

Which theory best explains the translocation of organic solutes?

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

The following figure illustrates the pressure-flow hypothesis. Which of the following represents the source?

The statement "There is no translocation at low temperature" was proposed by