Environment & Ecology Practice Question›› General Science ››
Biology
››
Symbiotic Relationships in Nature
M
Question 1
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Consider the following:
1. Lichens are a symbiotic partnership between a fungus and an algae.
2. The fungus is the dominant partner, giving lichens their shape and fruiting Bodies.
3. Lichens can have both green algae and cyanobacteria as their algal partners.
Which of the statements given above is/are correct?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 only
(d) 1, 2 and 3
Explanation Statement 1 is correct: A lichen is not a single organism; it is a stable symbiotic association between a fungus and algae and cyanobacteria.
Statement 2 is correct : Lichens are a complex life form that is a symbiotic partnership of two separate organisms, a fungus and an algae. The dominant partner is the fungus, which gives the lichen the majority of its characteristics, from its thallus shape to its fruiting bodies.
Statement 3 is correct : Most lichens involve two partners, a fungus and either an alga or cyanobacterium, but many species include both an algal and a cyanobacterial partner. Generally, the cyanobacterial partner in a tripartite relationship is considered as a secondary partner and is sometimes housed separately on the surface of the thallus.
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