3.5 Symbiosis

Question 1

What is symbiosis?

Answer 1

co-evolved intimate relationships between members of two different species

Question 2

What is a parasite?

Answer 2

• benefits in terms of energy or nutrients

- its host is harmed by the loss of these resources

Question 3

explain the metabolism of parasites

Answer 3

-parasites often have limited metabolism and cannot survive out of contact with the host

Question 4

Explain the transmission of parasites from host to host by direct contact

Answer 4

-parasites are passed from host to host by direct physical contact

Question 5

Explain the transmission of parasites by the release of resistant stages

Answer 5

• resistant larvae and pupae
• which can survive adverse environmental conditions
• until a new host comes into contact with them

Question 6

Explain the transmission of parasites by the use of a vector

Answer 6

-use of another species to transfer them from one host to another

Question 7

Explain parasitic life cycles

Answer 7

some parasitic life cycles involve intermediate (secondary) hosts to allow them to complete their lifecycle

Question 8

What is mutualism?

Answer 8

Both mutualistic partner species benefit in an interdependent relationship