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plectostele – a protostele in which plate-like regions of xylem appear in transverse section surrounded by phloem tissue, thus appearing to form alternating bands. [8] These discrete plates are interconnected in longitudinal section. Some modern club mosses have plectosteles in their stems. The plectostele may be derived from the actinostele.
Longitudinal section of a root. The first known printed reference to the rutabaga comes from the Swiss botanist Gaspard Bauhin in 1620, where he notes that it was growing wild in Sweden. It is often considered to have originated in Scandinavia, Finland or Russia. [11]
Lateral Root emerging from the pericycle (blue) in a cross-section of Iris germanico root. Lateral roots, emerging from the pericycle (meristematic tissue), extend horizontally from the primary root (radicle) and over time makeup the iconic branching pattern of root systems. [1]
The cross-section of a barley root. Root morphology is divided into four zones: the root cap, the apical meristem, the elongation zone, and the hair. [4] The root cap of new roots helps the root penetrate the soil. These root caps are sloughed off as the root goes deeper creating a slimy surface that provides lubrication.
Longitudinal section of the pelagophyte Plocamiomonas psychrophila under transmission electron microscopy showing system II fibre or rhizoplast (r) positioned at the base of the basal bodies and continuing parallel to the nucleus (N). The mature (mf) and immature (if) flagella are also visible.
The tip of the root is protected by a root cap that is continuously sloughed off and replaced because it gets damaged as it pushes through the soil. Cellular division via mitosis takes place at the very tip of the root cap. The newly created cells then begin a stretching process of cellular elongation, thereby adding length to the root.
F bicollateral open Cross section of celery stalk, showing vascular bundles, which includes both phloem and xylem Detail of vascular bundle: closed, collateral vascular bundles of the stem axis of Zea mays Vascular bundle in the leaf of Metasequoia glyptostroboides The vascular bundle of pine leaf showing xylem and phloem
The sagittal plane (/ ˈ s æ dʒ ɪ t əl /; also known as the longitudinal plane) is an anatomical plane that divides the body into right and left sections. [1] It is perpendicular to the transverse and coronal planes.