Q.
Which one of the following is an example of sub-aerial
modification of stem ?
1943
195
Morphology of Flowering Plants
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Solution:
In some plants the stem is feeble or weak and aerial
part of it grows horizontally on the ground while some
part remains underground. They may be of different
kinds like runner, stolon, trailers and offset. In runner
stem consists of long intemodes. Aerial branches are
formed from the axil of scaly leaves which are present on
the nodes while the roots arise from the lower side, e.g.
Cynodon, Hydrocotyle, Oxalis.