Question

Sieve tubes and companion cells are present in​

Answer 1

Explanation:

In sieve tube

…almost always adjacent to nucleus-containing companion cells, which have been produced as sister cells with the sieve element from the same mother cell. Companion cells apparently function with the enucleate sieve-tube elements and die when they break down. The sieve cells of nonangiospermous vascular plants lack true companion cells, although…