The bladder serving as floats for trapping insects is found in
a)	Zizyphus	b)	Utricularia	c)	Nephenthes	d)	Acacia

(b)

Utricularia or bladderwort is a submerged aquatic insectivorous plant. Its rootless, floating stem bears highly dissected leaves. A portion of leaf is modified into sac-like bladders of about 1.3 mm in diameter. Each bladder is guarded by a small valve, which opens inwardly. Small insects flow into the bladder with water but not able to come out to the pressure of volve.