Question

Function of sieve tubes are controlled by ?????

Answer 1

$\huge\green{As-Salamu-Alykum}$



___________

Function of sieve tube is controlled by companion cells


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$\huge\pink{INSHALLAH\;it\;will\;help\;U}$

Answer 2

I think the function of sieve tubes are controlled by the tissue parenchyma.

Hope it will help you.