A) mycorrhizal association
B) establishment of heterothallism
C) operation of heterothallism
D) advent of lichen formation
Correct Answer: D
Solution :
Lichen is a symbiotic relationship between algae (phycobiont) and fungi (mycobiont). Both partners are in constant physical contact and have equal physiological interdependence. The fungal partner takes part in reproduction, and protection while algae synthesis food through photosynthesis.
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