Question

A teacher explaining physical contact leading to equal physiological dependence between two thalloid forms was telling about

• A. Mycorrhizal association
• B. Establishment of heterothallism
• C. Operation of heterothallism
• D. Advent of lichen formation

Answer 1

The correct option is D Advent of lichen formation

Lichens are formed by the physical association between fungal partner and the algal partner. The fungal partner acts as a mycobiont and algal partner acts as a phycobiont. In lichens, fungus grow around algae and provide bulk for their growth. The algae and fungus association is must for lichens to reproduce. So, they are physically dependent on each other. Here, both fungus and algae are in their thalloid forms.

So, option D is the correct answer.