Answer: 6). The roots are modified into different structures to perform various activities. Ex. 1. Storage roots: They store food and nutrients Eg. Carrot 2. Prop roots: They appear above the ground and gives mechanical support to stem of the plant. Eg: Maize 3. Pneumatophores: These are above ground and are produced by trees that inhabit tidal swamps. By projecting above the water\'s surface, they absorb oxygen Eg: Rhizophora 4. Photosynthetic roots: They are aerial and consist of chloroplasts. They perform photosynthesis. Eg: Taeniophyllum Solution Answer: 6). The roots are modified into different structures to perform various activities. Ex. 1. Storage roots: They store food and nutrients Eg. Carrot 2. Prop roots: They appear above the ground and gives mechanical support to stem of the plant. Eg: Maize 3. Pneumatophores: These are above ground and are produced by trees that inhabit tidal swamps. By projecting above the water\'s surface, they absorb oxygen Eg: Rhizophora 4. Photosynthetic roots: They are aerial and consist of chloroplasts. They perform photosynthesis. Eg: Taeniophyllum.