Correct Option
The correct option is Dahlia - Root
Explanation
Vegetative propagation is a mode of asexual reproduction in plants where new individuals arise from vegetative parts such as roots, stems, and leaves, rather than from seeds. These structures are often modified for food storage and reproduction.
Option Analysis
- (a) Potato - Root: Incorrect. The potato is a modified underground stem known as a tuber. It possesses "eyes" (nodes) capable of producing new shoots.
- (b) Ginger - Leaf: Incorrect. Ginger is a modified underground stem called a rhizome. It grows horizontally beneath the soil and stores food.
- (c) Sweet Potato - Stem: Incorrect. The sweet potato is a modified adventitious root (tuberous root) that stores food and is used for vegetative propagation.
- (d) Dahlia - Root: Correct. Dahlia possesses fasciculated tuberous roots. These are modified adventitious roots that become swollen due to food storage and can generate new plants.
Key Takeaway: It is crucial to distinguish between underground stem modifications (e.g., Potato/Tuber, Ginger/Rhizome) and root modifications (e.g., Sweet Potato, Dahlia) when analyzing vegetative propagation.