What are the similarities between vessels and sieve tubes?

First of all, you need to remember that both sieve tubes and vessels in the plant perform a transport function. But vessels conduct water to the cells, and sieve tubes carry organic matter through the body of the plant. What they have in common is that they have an oblong shape and are devoid of nuclei. The cells of the vessels and sieve tubes are tightly connected. They play an important role in many processes. Since the vessels deliver water, photosynthesis occurs due to this. Sieve tubes send the finished products of photosynthesis to those plant organs that do not have chloroplasts.