Q.
Which of these plants have a modification of stem as indicated by the red arrow, in this diagram?
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NTA AbhyasNTA Abhyas 2020Morphology of Flowering Plants
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Solution:
The given diagram is of suckers a type of underground stem. In this modification, 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. It is seen in banana, pineapple and Chrysanthemum. Underground stems of some plants such as grass and strawberry, etc., spread to new niches and when older parts 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 growing aerially for some time arch downwards to touch the ground. A lateral branch with short internodes and each node bearing a rosette of leaves and a tuft of roots is found in aquatic plants like Pistia and Eichhornia.
