raphe
raphe
1. On some seeds, a ridge caused by the fusion of the funicle to the integument of the ovule.
2. In pennate diatoms (see BACILLARIOPHYTA) a split or longitudinal groove in the cell wall.
1. On some seeds, a ridge caused by the fusion of the funicle to the integument of the ovule.
2. In pennate diatoms (see BACILLARIOPHYTA) a split or longitudinal groove in the cell wall.
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Cell Wall , With very few exceptions, all cells are enveloped by an extracellular matrix composed of proteins , carbohydrates , and other substances. Owing to it… Protoplast , pro·to·plast / ˈprōtəˌplast/ • n. chiefly Bot. the protoplasm of a living plant or bacterial cell whose cell wall has been removed. DERIVATIVES: pro·… mycoplasmas , mycoplasmas A group of eubacteria that lack a rigid cell wall and are among the smallest of all living cells (diameter 0.1 μm–0.8 μm). They are eithe… Tracheid , tracheid One of the long, cylindrical, tapered cells in a trachea. The cell is dead and the wall has bands of lignin in it which add structural stren… Guard Cell , guard cell A specialized type of plant epidermal cell (see EPIDERMIS), 2 of which surround each stoma. Changes in their turgidity cause stomatal open… Cells , Cells
Plants are multicellular organisms composed of millions of plant cells. Although individual cells may differ greatly from each other in mature…
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raphe