Tracheids in a sentence

Banded tubes, as well as tubes with pitted ornamentation on their walls, were lignified citation and, when they form single celled conduits, are considered to be tracheids.

Damage to a tracheid's wall almost inevitably leads to air leaking in and cavitation, hence the importance of many tracheids working in parallel.

Defunct tracheids were retained to form a strong, woody stem, produced in most instances by a secondary xylem.

Even when tracheids do take a structural role, they are supported by sclerenchymatic tissue.

Growing to height also employed another trait of tracheids – the support offered by their lignified walls.

However, by the time they become competent to conduct water, all xylem tracheids and vessels have lost their cytoplasm and the cells are therefore functionally dead.

However, in early plants, tracheids were too mechanically vulnerable, and retained a central position, with a layer of tough sclerenchyma on the outer rim of the stems.

In most plants, pitted tracheids function as the primary transport cells.

In small passages, such as that between the plant cell walls (or in tracheids), a column of water behaves like rubber – when molecules evaporate from one end, they pull the molecules behind them along the channels.

This is an important role where water supply is not constant, and indeed stomata appear to have evolved before tracheids, being present in the non-vascular hornworts.

Tracheids end with walls, which impose a great deal of resistance on flow; vessel members have perforated end walls, and are arranged in series to operate as if they were one continuous vessel.

Tracheids may have a single evolutionary origin, possibly within the hornworts, citation uniting all tracheophytes (but they may have evolved more than once).

Wider tracheids allow water to be transported faster, but the overall transport rate depends also on the overall cross-sectional area of the xylem bundle itself.