Which of the following is the main point in disfavour of the Munch theory?

Which of the following is responsible for changing the direction of the source and sink in plants?

The "Cytoplasmic streaming hypothesis" is concerned with

Who supported the cytoplasmic flow hypothesis for translocation of food 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

By cutting a ring of tissues (girdling) in a stem,what can be achieved?