选项A“flower”(花)主要是繁殖结构,不是xylem和phloem主要存在的部位。选项B“root”(根)有维管束但不是其主要存在部位。选项C“stem”(茎)是xylem(木质部)和phloem(韧皮部)主要存在的部位,它们在茎中起到运输水分、养分等的重要作用。选项D“leaf”(叶子)虽然有叶脉等运输结构但不是这两种组织主要存在的部...
Phloem and xylem in stem of ramie.Jianrong, ChenFang, LiuYinghong, TangYoumei, YuanQingquan, Guo
Together with phloem (tissue that conducts sugars from the leaves to the rest of the plant), xylem is found in all vascular plants, including the seedless club mosses, ferns, horsetails, as well as all angiosperms (flowering plants) and gymnosperms (plants with seeds unenclosed in an ovary...
This tissue and the associated phloem constitute the vascular system of vascular plants. Xylem is composed of various kinds of cells, living or nonliving. The structure of these cells differs in their functions, but characteristically all have a rigid and enduring cell wall that is well preserved...
longitudinal section through xylem and phloemLongitudinal section through xylem (pink) and phloem (blue green); small circles within the phloem are the sieve areas of the sieve cells, and the dark red areas in the phloem are phloem parenchyma cells ...
Sign in to download full-size image Figure 4.19.Cross sections through a woody stem. (A) One-year-old stem. The arrow identifies the location of the cambium. Abundant xylem cells are found toward the center of the stem and a thin layer of phloem cells (P) appears to the outside of ...
Examples ofxylemin a Sentence Recent Examples on the WebThe remnants of thexylemand phloem — tubules that transport water, sugars and nutrients throughout living leaves — somehow become a root.— Douglas Main,New York Times, 25 Feb. 2024Bacteria can block thexylemvessels in the stems of cut...
nounthe woody part of plants: the supporting and water-conducting tissue, consisting primarily of tracheids and vessels Related Words vascular tissue tracheid ligneous plant woody plant Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc. ...
The vascular bundles (i.e. a vascular bundle consists of phloem and xylem tissues, plus vascular cambium) of a monocot stem are scattered whereas in dicot stems they are arranged in a ring pattern. Furthermore, dicots have secondary growth. In their stems, they form growth rings (annual ...
Multiple forms of xylem exist in plants. The first type is organized into complex structures called vascular bundles. Within these bundles, the xylem is located on the interior, toward the center of the stem, and the phloem is located on the exterior side. Vascular bundles are found in all ...