Lichens and Their Significance · NCERT Biology

Lichens are best described as an association between:

  1. Two different species of algae
  2. An alga and a nitrogen-fixing bacterium
  3. A fungus and an alga or cyanobacterium
  4. A fungus and a moss-like bryophyte
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Correct answer: A fungus and an alga or cyanobacterium

Lichens represent a symbiotic association between a fungal partner (mycobiont) and an algal or cyanobacterial partner (phycobiont). Both partners live together and benefit from each other.

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