Discuss the various types of positive in | Class 12 Biology Chapter Organisms and Population, Organisms and Population NCERT Solutions

Population can also be affected by the interactions that occurs between the organisms in the ecosystem. There are various types of positive interaction that are as follows:

(+) sign represents the positive effect of the one species on another species and (0) shows no effect.

Mutualism is the positive interaction which is a symbiotic relationship between the members of two different species in which both the members get benefitted. For example: Lichens are the mutualistic association of the photoautotrophic algae and heterotrophic fungi. 

Commensalism is the type of positive interaction and is a symbiotic relationship between the two species in which one species is benefitted and other neither benefits or nor is harmed. For example: Climbers (lianas) takes tree’s support for exposing their canopy without doing harm to the tree itself.