Which of the following cells or tissues is/are NOT commonly present in pines?

Question

BlackTom AI · Accepted Answer

Examining the question about which cells or tissues are NOT commonly present in pines, we should evaluate each listed option in turn.
Option a: tracheids. In gymnosperms like pines, the primary water-conducting cells in xylem are indeed tracheids. They are long, narrow cells with thick lignified walls and pits, serving both support and water transport. Therefore, tracheids are commonly present in pines.
Option b: vessel elements. Vessel elements are characteristic of many angiosperms and form vessel runs that provide efficient water transport. However, conifers, including pines, generally lack true vessel elements and instead rely on tracheids for xylem transport. This makes vessel elements not commonly present in pines.
Option c: hypodermis. The hypodermis is a specialized layer of cells just beneath the epidermis. In some plants, including certain gymnosperms, a hypodermis can be present in the cortex or specific tissues, contributing to protection or water balance. Its presence can vary among species and tissues, but it is a tissue type that can occur in conifers, though not universally defining pine anatomy.
Option d: endodermis. The endodermis is a single-layered ring of cells surrounding the vascular cylinder in roots, with Casparian bands that regulate apoplastic flow. Many seed plants, including gymnosperms such as pines, possess an endodermis in roots, so it is commonly present.
Option e: Pines have all of the above. Since vessel elements are not commonly present in pines, the statement that Pines have all of the above is inaccurate. Moreover, the commonality of the other tissues varies, but the key distinguishing feature is the absence of vessel elements in pines, which disqualifies this option.
In summary, evaluating each option shows that tracheids are typical of pines, hypodermis and endodermis can be present depending on tissue and species, and vessel elements are not commonly found in pines. The statement that vessel elements are commonly present would be incorrect, aligning with the general understanding of conifer anatomy.

Which of the following cells or tissues is/are NOT commonly present in pines?单项选择题

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