Question

The main function of sieve tubes is

• A. Food conduction
• B. Protein transfer
• C. Enzyme transfer
• D. Transcription

Answer 1

The correct option is A Food conduction

Sieve tube is an integral component of the phloem which is composed of several sieve tube elements which join end to end to form a channel for conduction. The main function of the sieve tube is the transport of carbohydrates, primarily sucrose, in the plant. The interface of the tubes contains pores which help in conduction. Each sieve tube element is normally associated with one or more nucleated companion cells, to which they are connected by plasmodesmata.
So, the main function of sieve tubes is food conduction and not protein transfer, enzyme transfer or transcription.
Thus, the correct answer is option A.