Stems | Biology For Majors II - Lumen Learning

Aerial Modifications of Stem. The stems are modified into aerial forms to perform important functions such as climbing, food storage, vegetative propagation, and protection. The stem modifications are as follows: Stem Tendrils. The stem gets modified into a threadlike leafless structure called tendrils. These are meant for climbing.The stem modification that has enlarged fleshy leaves emerging from the stem or surrounding the base of the stem is called a bulb; it is also used to store food. Aerial modifications of stems include tendrils, thorns, bulbils, and cladodes..13. Bulb - Tree onions" form clusters of small bulbs instead of flowers. Image credit: Kurt Stüber/Wikimedia.org. A bulb is a plant with an underground highly condensed discoid stem surrounded by fleshy leaves or leaf bases that store food that helps the plant survive adverse environmental conditions.E.g. onion, grasses; Besides their usual function of anchorage and absorption, they may also be suitably modified to carry out several other functions. Modifications of tap root: In many plants, the tap root becomes swollen and assumes various forms, which happens due to the storage of food.above-ground roots arising from the stem that can grow through the air and extend down into the soil ~provide extra absorptive capacity and anchorage/stability for the plant ~examples: corn, mangrove, screw pipe ~type of adventitious root

30.2D: Stem Modifications - Biology LibreTexts

Detachment of entire branch or a node can develop into a new plant. The plants are commonly known as creepers and their subaerial stem modifications meant for vegetative propagation. The weak sub-aerial stems are modified into following four types: 1. Runner: It is a creeping stem with long internodes, running horizontally on the soil surface.Onions are stem modifications of bulbs. Onions grow during a cold weather, but forms bulbs when the weather is warm. Onions can either be grown using seeds or through their bulbs. That is why, the stem modification of onions are bulbs. Tuber is from potatoes, whereas corm is from crocuses and gladioli.Corms and bulbs are shoot structures that are used for storage. A corm (example: crocus, Crocus) is a short, thick underground storage stem with thin scaly leaves. A bulb (example: onion, Allium) differs from a corm in the fact that it stores its nutrients in its fleshy leaves (Figure \(\PageIndex{2}\)). Figure \(\PageIndex{2}\) Bulbs (leftOnion It is the type of stem modifications where the scale leaves are with fleshy leaf bases, which are arranged in concentric manner surrounding the short, disc-like compressed stem. The outer leaves are dry, membranous and form a tunic-like structure.

The Different Types Of Stem Specializations Or

Types and Functions of stems . Introduction. Like roots, the stems also undergo modifications to perform various special functions. When a permanent change occurs in the structure of stems to perform new functions suitable for the environment, it is called as a 'stem modification'. Based on their nature, stem modifications are of threeModification : Sucker (sub aerial stem modification). X. Answer in detail. Question 1. Write a note an sub aerial modifications of the stem. Answer: Sub- aerial Modifications : Stem of some plants remains sub- aerial which grow horizontally on the surface of the soil for the purpose of reproduction. There are four types.stem axis with extremely reduced internodes and surrounding fleshy scale leaves (a). An onion is the example. Corm - A solid, bulb-like , underground stem without fleshy scales forms a corm. It has greatly shortened internodes. Examples are the food-storage, reproductive corms of Gladiolus and Crocus.In bulb stem modifications, the plants will created some of protections to protect their main part of flesh from the effect of weathering. We can see this in how Onion that has a lot of layers to protect their main flesh from weathering and keep it dryThe stem may be modified for: (a) Storage - Underground stems of plants like potato are modified into tubers which perform the function of storing food. Stem of plants like ginger are modified into rhizome while the stem of colocasia are modified into corm. All these stem modification perform the function of storing food.

Jane uproots a beetroot plant from the soil. She observes that the edible bulb of the plant is situated underneath the soil, and the leaves are positioned above the ground. Phloem is vascular tissue that helps in the expansion of the underground vegetable.

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