The carbohydrates synthesized in the leaves are transported through sieve tubes most commonly in the form of

Phloem sap is made up of

In higher plants,the translocation of food materials occurs through ..........

By which of the following techniques can we prove that phloem is the tissue responsible for food translocation?

Assertion : Long distance flow of photoassimilates in plants occurs through sieve tubes.
Reason : Mature sieve tubes have parietal cytoplasm and perforated sieve plates.

The direction of phloem sap in the phloem is ........