First slide

Populations

Question

Which one of the following is a matching pair of certain organisms and the kind of association?

Easy

A

Shark and sucker fish - Amensalism
B

Algae and fungi in lichens - Mutualism
C

Orchids growing on trees - Mutualism
D

Cuscuta (dodder) growing on other flowering plants - Epiphytism

Solution

The association between fungi and algae in lichen is regarded as the true mutual relationship, in which both the partners are benefitted. In lichen, fungus lives on the algae which manufactures food by virtue of the chlorophyll present in its cells, while the algae enjoys the protection afforded by the fungal envelope, to live in very dry conditions.
Shark and sucker fish - Commensalism
Orchids growing on trees - Commensalism
Cuscuta growing on hedge plants - Parasitism

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