Choose the incorrect pair

Easy

A

Stem modified as thorn - Citrus
B

Branch which arises from the underground portion of stem and eventually becomes aerial as leafy branch - Chrysanthemum
C

Aerial branch that arises from the base of the stem and arches down, touches the soil and strikes adventitious roots - Oxalis
D

Modified stem performs photosynthesis and modified leaves protect the plant - Opuntia

Solution

In Oxalis, the horizontal branches and stems spread on the surface of the soil have adventitious roots and leaves at every node and help in vegetative propagation. Such stems are called runners.

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