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You are watching: Onions are stem modifications of which of the following types




Stem Modifications

Some plant species have modified stems that are particularly suited to a specific habitat and atmosphere. A rhizome is a modified stem that grows horizontally underground; it has nodes and internodes. Vertical shoots might aclimb from the buds on the rhizome of some plants, such as ginger and also ferns. Corms are comparable to rhizomes, except they are even more rounded and fleshy (such as in gladiolus). Corms contain stored food that enables some plants to endure the winter. Stolons are stems that run practically parallel to the ground, or simply below the surconfront, and also deserve to give increase to brand-new plants at the nodes. Runners are a type of stolon that runs above the ground and also produces brand-new clone plants at nodes at differing intervals: strawberries are an instance. Tubers are modified stems that might save starch, as seen in the potato. Tubers arise as swollen ends of stolons, and contain many type of adventitious or unexplained buds (familiar to us as the “eyes” on potatoes). A bulb, which features as an underground storage unit, is a change of a stem that has the appearance of enlarged fleshy leaves arising from the stem or neighboring the base of the stem, as checked out in the iris.

Figure (PageIndex1): Stem modifications: Stem modifications allow plants to grow in a selection of environments. Shvery own are (a) ginger (Zingiber officinale) rhizomes, (b) a carrion freduced (Amorphophallus titanum) corm (c) Rhodes grass (Chloris gayana) stolons, (d) strawberry (Fragaria ananassa) runners, (e) potato (Solanum tuberosum) tubers, and (f) red onion (Allium) bulbs.

Modifications to the aerial stems, vegetative buds, and floral buds of plants perform attributes such as climbing, security, and also synthesis of food vegetative propagation. Aerial adjustments of stems encompass the following:

Figure (PageIndex1): Aerial changes of stems: Found in southeastern United States, (a) buckwwarm vine (Brunnichia ovata) is a weedy plant that climbs through the aid of tendrils. This one is displayed climbing up a wooden stake. (b) Thorns are modified branches. Tendrils are slender, twining strands that allow a plant (like the buckwheat vine) to seek support by climbing on other surfaces. These may construct from either the axillary bud or the terminal bud of the stem. Thorns are modified branches showing up as difficult, woody, sharp outgrowths that safeguard the plant; widespread examples encompass roses, osage oarray, and also devil’s walking stick. Bulbils are axillary buds that have actually come to be fleshy and also rounded because of storage of food. They become detached from the plant, autumn on ground and also develop into a brand-new plant. Cladodes are green branches of limited growth (commonly one internode long) which have actually taken up the features of photosynthesis.

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petiole. Provided by: Wiktionary. Located at: en.wiktionary.org/wiki/petiole. License: CC BY-SA: Attribution-ShareAlike axillary bud. Provided by: Wikipedia. Located at: en.Wikipedia.org/wiki/axillary%20bud. License: CC BY-SA: Attribution-ShareAlike internode. Provided by: Wiktionary. Located at: en.wiktionary.org/wiki/internode. License: CC BY-SA: Attribution-ShareAlike Boundless. Provided by: Boundmuch less Learning. Located at: www.boundless.com//physics/definition/node. License: CC BY-SA: Attribution-ShareAlike parenchyma. Provided by: Wiktionary. Located at: en.wiktionary.org/wiki/parenchyma. License: CC BY-SA: Attribution-ShareAlike phloem. Provided by: Wiktionary. Located at: en.wiktionary.org/wiki/phloem. License: CC BY-SA: Attribution-ShareAlike tracheid. Provided by: Wikipedia. Located at: en.Wikipedia.org/wiki/tracheid. License: CC BY-SA: Attribution-ShareAlike sclereid. Provided by: Wiktionary. Located at: en.wiktionary.org/wiki/sclereid. License: CC BY-SA: Attribution-ShareAlike lignin. Provided by: Wiktionary. Located at: en.wiktionary.org/wiki/lignin. License: CC BY-SA: Attribution-ShareAlike


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