L31

Question 1

define symbiosis, mutualism, commensalism

Answer 1

• close association of organisms of 2 different species (live together)

-association is beneficial to both (exchange)

-associal is beneficial to only 1 partner

Question 2

define parasite + parasitoid

Answer 2

• one who lives at another expense, causing HARM
• can be direct (only 1 host exploited, monxenous) or indirect (2 or more hosts exploited, parasite switches, heteroxenous parasite)

-organism that feeds up its host + almost always causes death of the host following the parasitic exploitation

Question 3

define definite host, intermediate host, and paratenic/transport host

Answer 3

• host where parasite reaches sexual maturity
• host required for parasite development, but where parasites do NOT reach sexual maturity
• parasite does not undergo any development, but in which it remains alive and infective to another host

Question 4

define vectors, mechanical + biological

Answer 4

-organism (invertebrae) that transmits the parasitic agent fromj 1 vertebrate host to another

-mechanical: no development or multiplication fo the microorganism takes place

• biological: in which either multiplication or development of microorganism occurs

Question 5

heminmetabolous vs holometabolous metamorphosis of arthropoda

Answer 5

-incomplete metamorphosis
-preadult stages are morphologically similar to adults (gradual change in body form)
-all stages feed the same, inhabit same environment

-complete metamorphosis
-preadult stages are not morphologically similar to adults (obvious change from larva to adult)
-larvae feed different/, inhabit different environment