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A crusty lichen on a rock is an alga living together with a:

AFungus
BMosses
CInsect
DBacteria
Answer & Solution
Correct answer: A. Fungus
1. A lichen always has two partners. 2. One is a green alga, the other a fungus. 3. So the alga lives with a fungus. _Source: syllabus Science Class VII, Chapter 1, Nutrition in Plants._
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