A) Trapa
B) Wolffia
C) Ceratophyllum
D) Limnophila
Correct Answer: A
Solution :
On the basis of floral characters, Roy (1949) proposed the removal of Trapa from Onangraceae and its inclusion in a separate family-Trapaceae. It contains swollen spongy petioles and its root also contain chlorophyll for photosynthesis.
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