Starch is insoluble in water,yet it is accumulated in large quantities in potato because:

Although starch is insoluble in water,it is stored in large quantities in potatoes. Why?

Organic substances such as sugars are translocated in phloem can be demonstrated by

Explain the pressure flow hypothesis of translocation of sugar in plants.

Arrange the following events of mass flow of organic material in sequence:
$I$. Sugars are transported from cell to cell in the leaf
$II$. Food is synthesized in form of glucose by leaf cells
$III$. Movement of water takes place into sieve tube elements
$IV$. Downward movement of sugar occurs in the stem
$V$. Solutes are actively transported into the sieve elements

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