Sustainability and Interdependence - Symbiosis

Question 1

symbiosis

Answer 1

• intimate relationship between organisms of two different species that live in direct contact with one another
• these relationships are a result of coevolution

parasitism, mutalism, commensalism

Question 2

parasite

Answer 2

organism in parasitism which gains nutrients or energy from its host and the host is harmed as a result

e.g. mosquito, tape worm

Question 3

transmission of parasites

Answer 3

• direct contact - passed from host to host through physical contact
• release of resistant stages - some stages in the life cycle of an organism are resistant and able to survive adverse conditions until they come into contact with a new host
• use of a vector - intermediate organism that transports the parasite from one oraganism to another

Question 4

direct life cycle

parasitic life cycle

Answer 4

• the life cycle involves only one species of host
• common amongst parasites which feed on the outside of their host

Question 5

indirect life cycle

parasitic life cycle

Answer 5

• in the primary host the parasite undergoes sexual reproduction
• in the secondary host the parasite completes its life cycle and/or allows asexual reproduction to occur

increases chances of survival

Question 6

mutualism

Answer 6

both partner species involved in the interdependent relationship benefit

Question 7

coevolution

Answer 7

gradual change in parallel of two symbiotic organisms which increases their level of adaptation to suit a dependent or interdependent relationship

Question 8

interdependence

Answer 8

relationship that exists between the two partners involved in a mutualistic relationship