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Ranunculus Root Cross Section. The endodermis is the innermost layer of cortex in land plants.It is a cylinder of compact living cells, the radial walls of which are impregnated with hydrophobic substances (Casparian strip) to restrict apoplastic flow of water to the inside. [1]
Around the same time the aquatic, scorpion-like eurypterids became the largest ever arthropods, some as long as 2.5 m (8 ft 2 in). [ 80 ] The oldest known arachnid is the trigonotarbid Palaeotarbus jerami , from about 420 million years ago in the Silurian period. [ 81 ] [
Plant embryonic development, also plant embryogenesis, is a process that occurs after the fertilization of an ovule to produce a fully developed plant embryo.This is a pertinent stage in the plant life cycle that is followed by dormancy and germination. [1]
[6] [7] A plant lacking in phosphoglucomutase (pgm), for example, is a starchless mutant plant, thus preventing the settling of the statoliths. [8] This mutant shows a significantly weaker gravitropic response as compared to a non-mutant plant. [8] [9] A normal gravitropic response can be rescued with hypergravity. [9]
Papery (upper) and leafy bracts on hay rattle (Rhinanthus minor).All the "leaves" in this image are bracts. In botany, a bract is a modified or specialized leaf, especially one associated with a reproductive structure such as a flower, inflorescence axis, or cone scale.
Clinacanthus nutans is a herbaceous plant that grows in low shrubs up to 2.5 meters (8 ft 2 in) high. Its stems are green, woody, upright and cylindrical. Its leaves are green, simple, lanceolate with pointed tips and rounded bases, and are 8–12 cm (3.1–4.7 in) long and 4–6 cm (1.6–2.4 in) wide.