unit 3 KA5 - symbiosis

Question 1

what is meant by symbiosis

Answer 1

co-evolved intimate relationships between members of two different species

Question 2

what are the types of symbiotic relationship

Answer 2

• parasitism

- mutualism

Question 3

describe a parasite relationship

Answer 3

• the parasite benefits in terms of energy or nutrients

- its host is harmed by the loss of these resources

Question 4

can parasites survive without their hosts? explain your answer.

Answer 4

no they often cannot survive out of contact with a host because they have limited metabolisms

Question 5

what are the three ways to transmit parasites to new hosts

Answer 5

• direct contact
• resistant stages
• vectors

Question 6

what is meant by an indirect life cycle

Answer 6

this is when some parasitic life cycles involve secondary hosts to allow them to complete their life cycle

Question 7

what happens in mutualism

Answer 7

both mutualistic partner species benefit in an interdependent relationship

Question 8

what is meant by the term vector

Answer 8

An organism which carries disease from one individual to another without suffering from the disease

Question 9

what is meant by the term resistant stages

Answer 9

Resistant stages are a part of the parasites lifecycle where they are resistant to adverse environmental conditions and can survive for long periods of time.