Zoology - Organisms and Populations Question with Solution | TestHub

In a lichen thallus, algae and fungi show mutualism. Fungi provide fixation, water, minerals and shelter to the algae. The algae manufactures food for itself and for fungi.
Suckerfish and shark show commensalism as there is no negative interaction between the two. The same type of relationship is seen between orchids growing on trees. Cuscuta is a parasite and thus exhibit parasitism while growing on other plants.