5. symbiosis

Question 1

what is symbiosis

Answer 1

an co-evolved intimate relationship between members of two different species.

Types of symbiotic relationship include: parasitism, mutualism.

Question 2

describe parasitism

Answer 2

A parasite is an organism that lives on or in another organism (the host).

A parasite benefits in terms of energy or nutrients, whereas its host is harmed by the loss of these resources

Question 3

describe parasite hosts

Answer 3

The primary host is the one the parasites live and reproduce in. Some parasitic life cycles involve intermediate (secondary) hosts to allow them to complete their life cycle

The most effective parasites do not cause the death of the host. Changing hosts is difficult and subject to chance

Question 4

what are the three ways parasites can be transmitted

Answer 4

-direct contact
-resistant stages
-vectors

Question 5

examples of direct contact transmittion

Answer 5

head lice passing from one person to another

Question 6

describe resistant stages

Answer 6

are a part of the parasite’s life-cycle where they are resistant to adverse environmental conditions and can survive for long periods of time.

Question 7

describe vectors

Answer 7

an intermediate host which transfers the parasite directly into the primary host (eg. mosquitoes transferring malaria)

Question 8

describe mutualism

Answer 8

Both mutualistic partner species benefit in an interdependent relationship