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| 1. |
Distinguish between Roots of Cascuta and Orchid OR Parasitic root and Hygroscopic root. |
| Answer» DEFINITION of Adventitious Root System: Roots that grow from any part of PLANT other than the radicle or its branches are called adventitious roots (L. adventitious— extraordinary). They BRANCH like the tap root. A mass of adventitious roots along with their branches constitute an adventitious root system. Adventitious root system may be underground or aerial. They GENERALLY develop from stem nodes, intermodals, leaves, etc. Horizontal stem of creepers often develop adventitious roots from the nodes (e.g., Grass, Wood Sorrel). Branch CUTTINGS and leaf cuttings (e.g., Rose, Sugarcane, Tapicca, Sansiviena) develop adventitious roots when placed in soil. In Coleus, the cuttings develop adventitious roots on being partially immersed in water. Hormones also induce development of adventitious roots. Fibrous Roots: They are underground roots which arise in groups from the nodes of an horizontal stem (e.g., Grass, Fig. 5.10). The main roots are of equal length. They give off small branches. Both the main root and their branches are thin and thread-like. Therefore, they are called fibrous roots. The fibrous roots do not penetrate deep in the soil. They remain near the soil surface and are called surface feeders. Explanation: | |