Which of the following propagates through leaf tips?
Adiantum caudatum or walking fern propagates vegetatively through adventitious buds growing at the tips of leaves.
Vallisneria propagates vegetatively through runners. Runners are narrow, creeping horizontal stems with long internodes and nodes bearing axillary buds which develop at the base of erect shoots.
Eichhornia propagates vegetatively through offsets. Offsets are runners of aquatic plants. They originate from the leaf axil which runs horizontally having a rosette of leaves above and adventitious roots below.
Opuntia propagates vegetatively through phylloclades. Each segment of such stems can form a new plant.