Question

[3]


a) Name the interaction represented by the table.
b) Give examples for each.
c) What does Gause’s principle state?

Answer 1

a) Species A Species B [0.5]
+ +
This type of intercation is known as Mutualism.

Species A Species B [0.5]
- -
This type of intercation is known as Competition.

b) Mutualism : Lichens [0.5]
Competition : In a forested area trees, shrubs herbs and vines compete with one another for sunlight, nutrients, waters, pollinators and dispersal agents. [0.5]

c) Gause's principle states that two closely related species competing for the same resources cannot co-exist indefinitely and the competitively inferior one will be eliminated eventually. This may be true if the resources are limiting, but otherwise not. [1]