A) Azolla
B) Parthenium
C) Salvinia
D) Salicomia
Correct Answer: B
Solution :
Parthenium is a most noxious terrestrial weed all over the world. Its seeds are very tiny and wind dispersed- It is commonly called congress grass or carrot grass. It competes with crop plants for space, water and nutrients and so should be irradicated properly before sowing the crop.
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