(A) In $Pistia$ and $Eichhornia$,the stem is modified into a structure called an offset.An offset is a lateral branch with short internodes and each n

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(A) In $Pistia$ and $Eichhornia$,the stem is modified into a structure called an offset.An offset is a lateral branch with short internodes and each node bears a rosette of leaves and a tuft of roots.This is a common method of vegetative propagation in aquatic plants.