1. Tardigrade
  2. Question
  3. Biology
  4. Parts of two plants were observed. Structure-A develops aerially and produces roots when comes in contact with the soil. Structure-B develops from underground part of the stem, grows obliquely becomes aerial and produces roots on its lower surface. Identify, respectively the structure of A and B.

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Q. Parts of two plants were observed. Structure-A develops aerially and produces roots when comes in contact with the soil. Structure-B develops from underground part of the stem, grows obliquely becomes aerial and produces roots on its lower surface. Identify, respectively the structure of A and B.

ManipalManipal 2010

Solution:

Stolons are special kind of runners which initially grow upwards like ordinary branches and then arch down to develop new daughter plants on coming in contact with the soil. Sucker is a subaerial branch, that arises from the main stem. Initially it grows horizontally below the soil surface and later grow obliquely upwards.
Runners are prostrate aerial stems which has a long intemode and which creeps horizontally. Axillary buds arise form nodes to form aerial shoots and roots, eg, Cynodon and Oxalis.