Question

Define
sieve tube and write it's function

Answer 1

Sieve elements are specialized cells that are important for the function of phloem, which is highly organized tissue that transports organic compounds made during photosynthesis


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Answer 2

Definition of sieve tube

: a tube consisting of an end-to-end series of thin-walled living plant cells characteristic of the phloem and held to function chiefly in translocation of organic solutes

Function:

The short answer is that they are the “highway” for sugar transport. Sieve tubes are basically how sugars get from sugar-abundant cells like leaves to sugar-deficient cells like growing roots/leaves/flowers as well as other metabolically active cells.

Basically, the pathway for sugars is sugar-rich cells -> companion cells -> sieve tubes -> different companion cells -> sugar-deficient cells.