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Corm, bulbo-tuber, or bulbotuber is a short, vertical, ... the contractile roots no longer grow and the corm is no longer pulled deeper into the soil. In some other ...
The blades are parallel-veined. The margin is entire. The corms form in vertical chains, with the youngest at the top, and oldest and largest buried most deeply in the soil. The roots of the lowermost corm in a chain are contractile roots and drag the corm deeper into the ground where conditions allow.
The corms are symmetrical and globose or oblate (round in shape with flatted tops and bottoms), and are covered with tunic leaves that are fibrous, membranous or coriaceous (leathery). The corms produce fibrous roots, and contractile roots which adjust the corms depth in the soil, which may be pulled as deep as 20 centimetres (8 in) into the soil.
Contractile roots: roots that pull bulbs or corms of monocots, such as hyacinth and lily, and some taproots, such as dandelion, deeper in the soil through expanding radially and contracting longitudinally. They have a wrinkled surface.
The thin tunic leaves are dry papery, dead sheaths, formed from the leaves produced the year before. They act as a covering that protects the corm from insects and water loss. Internally a corm is mostly made of starch-containing parenchyma cells above a more-or-less circular basal node that grows roots. Corms are sometimes confused with true ...
A geophyte (earth+plant) is a plant with an underground storage organ including true bulbs, corms, tubers, tuberous roots, enlarged hypocotyls, and rhizomes. Most plants with underground stems are geophytes but not all plants that are geophytes have underground stems. Geophytes are often physiologically active even when they lack leaves.
Contractile-roots or Pull-roots – Haptera – root-like projections found in macroalgae or lichens that anchor the organism to a rocky substrate. Protective functions – Root-thorns – Reproductive roots – These roots contain root-buds and actively take part in shoot-regeneration, and thus in vegetative reproduction.
A contractile vacuole (CV) is a sub-cellular structure involved in osmoregulation. It is found predominantly in protists , including unicellular algae . It was previously known as pulsatile or pulsating vacuole.