Question

1. refer to the fungus and algae relationship in model 2.

a. is there a benefit for one of the organisms or for both?
b. is either the fungus or the algae harmed by this relationship?
c. which other relationship in model 2 is similar to that between the fungus and the algae?

1. refer to the shark and remora relationship in model 2.

a. in the shark and remora relationship, is there a benefit for one of the organisms or for both?
b. is either the shark or the remora harmed by this relationship?
c. which other relationship in model 2 is similar to that between the shark and the remora?
read this!
symbiotic relationships are identified by how they affect the organisms involved. the three types of symbiotic relationships are listed below.

• mutualism: both organisms benefit from the relationship.
• parasitism: one organism benefits and the other is harmed.
• commensalism: one organism benefits and there is no effect on the other.

1. using the information from the read this! box, label each of the relationships in model 2 as mutualism, parasitism or commensalism.
2. with your group, choose one of the organism pairs from model 2 and justify why you characterized the relationship as you did.

Explanation:

10a. In the fungus - algae relationship (lichens), it is mutualism where both benefit. Algae perform photosynthesis providing food, and fungi offer protection and access to water and minerals.
10b. No, neither is harmed as it is a mutualistic relationship.
10c. Other mutualistic relationships in Model 2 (if any) would be similar.
11a. In the shark - remora relationship, the remora benefits by getting food scraps and transportation, while the shark is not benefited.
11b. No, the shark is not harmed and the remora benefits.
11c. Other commensal relationships in Model 2 (if any) would be similar.

1. Identify each relationship in Model 2 as mutualism (both benefit), parasitism (one benefits, one is harmed), or commensalism (one benefits, no effect on the other) based on the given definitions.
2. Group activity to choose an organism pair from Model 2 and justify the categorization of their relationship.

Answer:

10a. Both organisms benefit.
10b. No.
10c. Depends on other relationships in Model 2 (if mutualistic).
11a. One organism (remora) benefits.
11b. No.
11c. Depends on other relationships in Model 2 (if commensal).

1. Categorize relationships as mutualism, parasitism or commensalism based on definitions.
2. Group - chosen organism pair and justification of relationship categorization.