<P> In plant anatomy , sieve tube elements , also called sieve tube members , are highly specialised type of elongated cell in the phloem tissue of flowering plants . The ends of these cells are connected with other sieve tube members , and together they constitute the sieve tube . The main function of the sieve tube is transport of carbohydrates , primarily sucrose , in the plant ( e.g. , from the leaves to the fruits and roots ) . Unlike the water - conducting xylem vessel elements that are dead when mature , sieve elements are living cells . They are unique in lacking a nucleus at maturity . </P>
name the cell which is attached to the lateral side of sieve tube
sieve tube elements