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(a) Cyperus rotundus
(b) Eichhornia crassipes
(c) Trapa latifolia
(d) Trapa bispinosa
[CBSE AIPMT 1993]
Correct Option (b) Reason : Eichhornia crassipes is a native of America and is exotic species to India. It has become a trouble some weed in many aquatic habitats causing eutrophication and many other ecological problems.
Correct Option (b) Reason : Eichhornia crassipes is a native of America and is exotic species to India. It has become a trouble some weed in many aquatic habitats causing eutrophication and many other ecological problems.