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. The advent of lichen formation

Answer 1

Hint: The direct response by the touch of a plant or plant organ with a solid object is known as thigmotropism. This directional response is generally caused by the induction of some pattern of really differential growth in a fairly major way. Some of the climbing tendrils of some plants clearly illustrate the above phenomenon, basically such as the sweet pea, or so they thought.

Complete answer:
Lichens essentially are formed by the pretty physical association between fungal partner and the generally algal partner in a major way. The fungal partner acts as a mycobiont and the fairly algal partner acts as a phycobiont, which kind of shows that lichens are formed by the physical association between fungal partners and the pretty algal partner, which essentially is fairly significant. In lichens, fungus grows around algae and provides bulk for their growth, or so they particularly thought. The algae and fungus association is a must for lichens to reproduce, demonstrating how the fungal partner acts as a mycobiont and particularly algal partner acts as a phycobiont, which shows that lichens kind of are formed by the fairly physical association between fungal partner and the algal partner, or so they for the most part though. So, they are physically pretty dependent on each other in a subtle way. Here, both fungus and algae are in their thalloid forms, which is fairly significant.

Hence, the correct answer is option D. A teacher explaining physical contact leading to equal physiological dependence between two thalloid forms was telling about the advent of lichen formation.

Note:
Lichen is an organism that for the most part is formed by the symbiotic association of a fungus and an alga or cyanobacterium and occurs as crusty patches or bushy growths on tree trunks, actually bare ground, etc.,