Multiple choice

Lichens are an example of

  1. Parasitism

  2. Symbiosis

  3. Mutualism

  4. Commensalism

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A well known case of symbiosis, corresponds to lichens. Lichens organize from an obliged interaction, between a fungus and a green alga. The interaction is extreme, because the individuals not only do not belong to the same species, but they do neither belong to the same kingdom. The fungus provides an adequate humid bed to the algae, and this provides with free food, to the fungus. The relation has occurred so narrowly in the course of the evolution, that an isolated species, cannot subsist without the other.

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