Question

Difference between sieve tube and companion cells

Answer 1

Phloem elements do typically have sieve plates instead of final walls. Sieve-tube members of angiosperms are associated by living companion cells. ... One of the principal differences between sieve cells and sieve-tube members is the presence of sieve plates in sieve-tube members, that are absent in sieve cells.

Answer 2

sieve tube: they do not have nucleus.
but have a thin layer of cytoplasm.
the cells are responsible for the transportation of food and nutrition.

companion cell:small elongated cells
have dense cytoplasm and a prominent nucleus.
they perform tasks required for sieve cells for living.

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