Why is water hyacinth called the 'Terror of Bengal'?

  • A
    It is being used as food for fish.
  • B
    It consumes oxygen from cultivated plants and destroys them.
  • C
    It consumes oxygen from water and decreases $O_{2}$ concentration in water.
  • D
    It is a weed.

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Which of the following plants develops various structures for protection against herbivores?

The interaction observed in this diagram is

This is an interaction in which one species benefits and the other species is neither harmed nor benefited.

Which characteristic is observed in the $Gause's$ Competitive Exclusion Principle?

Match the Column-$I$ and Column-$II$:
Column-$I$Column-$II$
$(P)$ Lichens$(i)$ Parasitism
$(Q)$ Abingdon tortoise and goat$(ii)$ Commensalism
$(R)$ Sea anemone and clown fish$(iii)$ Competition
$(S)$ Human and liver fluke$(iv)$ Mutualism

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