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There are some plants that have modified stems that grow below ground and typically serve as food storage sites. Irish potatoes are an example of below-ground stems, along with true bulbs like onions and tulips. (Fun plant-part trivia: Irish potatoes are stems and sweet potatoes are roots.) Some plants have horizontal stems called
31 paź 2023 · Some plant species have modified stems that are especially suited to a particular habitat and environment. A rhizome is a modified stem that grows horizontally underground; it has nodes and internodes.
30 sty 2024 · Stems come in different shapes and sizes and some plants have modified or specialized stems that serve other purposes. For example, some stems grow underground and are used by the plant to store food reserves. How can you tell if an underground plant structure is a stem or a root?
Stems of many plants are modified to perform different functions such as storage, protection, photosynthesis, support, propagation and perennation. Modifications help in better adaptation and survival.
Here are the main types: Aerial Stems: These are the typical stems that we see. They grow above the ground and are exposed to sunlight. They can be further classified into different types, such as erect (like trees), weak (like vines), and modified (like tendrils). Subaerial Stems: These stems grow partially in the air and partially underground.
Purposes: Stems can be modified for storage (cacti, potato’s, onions, lilies), reproduction (garlic, crocus, strawberries, many ferns, bamboo), defence (thorns – bougainvillea, Carissa species) and photosynthesis (Cacti, Jacksonia sp.) Pachycaul stems of plants such as Boabs, desert roses, etc.
Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig and the origin and development of stems. Also included are the different modified stems that carry out special functions.
