Phloem sap is made up of

In plants,polymerisation of excess sugar into starch takes place in the . . . . . . at the sink end.

$A$ 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?

......... and ......... may be reversed depending on the season or the plant's need.

Which structure of the phloem creates a pressure gradient in the sieve tube?

Chemical analysis of phloem sap shows the presence of: