In which form is food transported in plants?

Bidirectional translocation of minerals takes place in

$A$ 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?

In vascular plants,what is the nature of the transport of organic and mineral nutrients in the phloem?

The direction of the conduction of food through phloem is

The concept of "Active mass flow in which oxygen is required" was proposed by: