Question

Which one of the following plants does not help in vegetative propagation by leaves?
A. Begonia
B. Kalanchoe
C. Bryophyllum
D. Oxalis

Answer 1

In plants, when vegetative parts like stem, leaves, buds or roots act as propagules for the production of a new plant, it is known as vegetative propagation or vegetative reproduction. It is a type of asexual reproduction as it does not require seeds or spores for the process of multiplication. The phenomenon is common in many lower as well as higher plants.

Complete answer:
Vegetative propagation is a natural way of propagation in many perennial plants. These plants show certain modifications in their roots, stems or leaves to regenerate effectively. Begonia, Bryophyllum and Kalanchoe are plants in which vegetative propagation occurs by means of leaves. However, plants like Oxalis have modified stems called runners which run parallel to the ground. They are creeping stems which bear adventitious roots at various junctions called nodes.

New aerial shoots also emerge at these nodes and become a new plant. When such runners break at any point, the separated part is capable of regenerating into a complete individual plant and surviving. Some species of Oxalis also develop bulbils as a means of propagation. Bulbils are fleshy buds that are found above the root base or axil of foliage leaves. They sprout into new plants when the buds fall off into the soil.

Hence, the correct answer is option (D).

Note: Vegetative propagation can be done by natural or artificial means. Gardeners or horticulturists use vegetative parts like runners, rhizomes, suckers, tubers, etc. as propagules for growing new plants. Vegetative propagation is a quick and certain method of propagation in less time. Plant producers prefer this method as it needs less care and observation along with desired characteristics.