| Consider the following interactions amongst different species. |
| 1. Lichens are formed by the association of algae and fungi. |
| 2. E.Coli lives in large intestine of human beings. |
| 3. Jackals follow a lion or tiger for obtaining food. |
| 4. Coral reefs are formed by the association of algae and coelenterates. |
| 5. Birds feed on ticks and lice present on the body surface of the cattle. |
| Which of the above interactions are examples of mutualism or symbiosis? |
A) 1, 2, 3 and 4
B) 1 and 4
C) 2, 3, 4 and 5
D) 1, 3, 4 and 5
Correct Answer: B
Solution :
[b] Mutualism or symbiosis is an interaction between two organisms of different species where both the partners are mutually benefitted and cannot live separately. Example of E. Coli is commensalism, in which smaller organism is benefitted and the larger organism remain unaffected. Feeding birds on ticks and lice present on the body surface of the cattle is an example of proto-cooperation. It is kind of interaction in which two living organism of different species are mutually benefitted and can live independently.
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