Translocation of organic materials in plants is explained by:

Transport of food material in higher plants takes place through

Which of the following theories explains bidirectional translocation?

Which theory best explains the translocation of organic solutes?

When a plant is girdled,what happens?

$A$ 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?