CBSE Class 6 Answered
root modifications
Asked by ndawood2000 | 15 Sep, 2018, 09:30: PM
Expert Answer
The roots in some plants are modified for support, storage of food and respiration.
1. In leguminous plants, roots develop small nodules which contain bacteria; they fix nitrogen of the soil into soluble nitrates which improves the fertility of the soil.
2. In plants which are found in marshy land, roots come above the ground like cones. They have minute pores through which they take air for respiration.
3. In some plants, the taproot may get thickened for storage of food. These roots called asstorage roots assume various shapes. Example - Carrots are conical in shape whereas radish is spindle-shaped; beetroot and turnip are roundish.
For example,
(a) Maize: Stilt roots arise from the nodes of the stem to support the plant.
(b) Carrot: Roots are swollen and store food.
(c) Banyan Tree: Prop roots arise to support the tree.
(d) Rhizophora: Roots arise above the ground to obtain oxygen for respiration.
Answered by Sivanand Patnaik | 16 Sep, 2018, 12:39: PM
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