Question

Which one propagates through an offset ?
A. Cynodon dactylon
B. Eichhornia
C. Fragaria
D. Mentha

Answer 1

Stem is a part of the plant bearing branches, leaves, flowers, and fruits it develops from the plumule of the embryo of a germinating seed. Stem bear node and internode.

Step by step answer:Cynodon dactylon is which grass which lives more than two years and propagates by the means of and stolons. Cynodon dactylon is also known as Bermuda grass.
-Eichhornia is an aquatic species which propagates very rapidly. It propagates with the help of offset. It is the modification of stem which is used for asexual reproduction in plants by which new offsprings are formed.
-Fragaria is a herbaceous plant that has no persistent woody stem above ground but has vascular bundles. They are commonly known as strawberries and propagate with the help of runners.
-Mentha is a herb which has vascular bundles. It is commonly known as peppermint and propagates with the help of an underground stolon.
Hence, the correct answer is ( B )
Some additional information :
Eichhornia is the modification of stems. Examples of modification of stem. Underground stems of some plants such as grass and strawberry etc. spread to new niches and when old plants die new plants are formed.
In plants like mint and Jasmine, a slender lateral branch arises from the base of the main axis and after going aerially for sometime arch downwards to touch the ground.
In banana, pineapple, and chrysanthemum the lateral branches originate from the basal and underground portion of the main stem, grow horizontally beneath the soil, and then come out obliquely upward giving rise to leafy shoots.

Note: Eichhornia was bought by India for its beauty and it became the terror of Bengal. It is an aquatic plant that can grow very rapidly and absorbs the oxygen required for other organisms or plants for growth.