Name the sub-aerial stem modification seen in free floating aquatic plants. How does it help in vegetative propagation?

Name the sub-aerial stem modification seen in free floating aquatic plants. How does it help in vegetative propagation? 
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Ans: Off-set is the sub-aerial modified stem seen in free floating hydrophytes. It is brittle and has leaves and roots at its only node. When broken accidentally, it is separated from parent plant and can lead independent life.  
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