Which one of the following is enucleated cell?Guard cellCompanion cellVesselAll the above

The enucleated cell among the options given is the Vessel.

Enucleated means the cell does not have a nucleus. In plants, the most common type of enucleated cells are the vessels, which are part of the xylem tissue responsible for water transport.

Guard cells and companion cells both contain nuclei, so they are not enucleated. Guard cells are involved in the opening and closing of stomata, while companion cells assist in the function of sieve-tube elements in phloem tissue.