Choose the incorrect statement.

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(C) In $C$,the statement claims that the stem becomes flat and decreases photosynthesis in $Euphorbia$. This is incorrect because in $Euphorbia$,the s

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Stem becomes flat and decreases photosynthesis in Euphorbia.

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(C) In $C$,the statement claims that the stem becomes flat and decreases photosynthesis in $Euphorbia$. This is incorrect because in $Euphorbia$,the stem becomes fleshy,flat,and green to perform photosynthesis,not to decrease it. In $A$,watermelon stems are modified into tendrils for climbing,which is correct. In $B$,$Bougainvillea$ possesses woody,pointed thorns which are modified stems,which is correct. In $D$,$Eichhornia$ (water hyacinth) has offsets,which are modified stems used for vegetative reproduction,which is correct.

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