Question

mensalism BARNACLE SCALLOP Makes a hard, flat shell Needs a hard, flat, open surface to attach to and live on The scallop provides a flat surface for barnacle to attach and live on. Please use "+" and "."signs to indicate "gain benefit" and "get harmed". Scapllop: ("+" or "" or "no effect") barnacle: ("+" or "-" or "no effect") Their relationship is (parasitism, mutualism or commensalism)

Answer 1

Answer1.Type of ecological interaction or relationship between scallop and barnacles is known as commensalism. In this type of relationship one of the organism benefit and the other one remains unaffected or we can say that it neither gets any benefit nor get any harm.

Barnacles belong to a class of crustaceans in phylum Arthropoda and Scallops belong to the phylum of molluscs. As these Scallops make hard, flat shells to which these sedentary Barnacles can attach and live in suitably without causing any harm or benifit to its host. This type of relationship is known as commensalism. It is designated by +,0

Where,

Scallop: no effect : 0

Barnacles: +

Answer2.

Leibigs law of minimum which says that growth is controlled by the scarciest resource was actuallly applied to plant growth initially and it cannot be applied appropriately to human population growth. This is because there is no only one such limiting factor or the scarciest resource that can limit the growth of human population. Rather there are number of factors that collectively may limit or affect growth of human population to an extent only. In addition to this the humans have the capability to adapt or adaptation effect which gives them the ability to grow even if some of the resources become limiting. This is known as law of Minimum paradox and thus justifies that leibigs law of minimum cannot be appropriately applied to human population.