3.5 symbiosis

Question 1

Define symbiosis

Answer 1

Any interaction between 2 different species

Question 2

What are the 2 types of symbiotes

Answer 2

• parasitism

- mutualism

Question 3

Define parasitism

Answer 3

-where one organism (the parasite) benefits from the relationship by obtaining energy and/or nutrients from the other organism (the host) which is harmed or loses energy and/or materials/nutrients

Question 4

Give an example of parasitism

Answer 4

Tick feeding on a dear’s blood

• tick benefits taking nutrients from deers blood
• deer is harmed from disease or loss of nutrients

Question 5

State the three type of transmission of parasites

Answer 5

• direct contact
• release of resistant stages
• use of vector

Question 6

Define direct contact

Answer 6

-where a parasite is passed on from physical contact

Eg head lice

Question 7

Define release of resistant stages

Answer 7

-when th parasite is able to survive adverse conditions until it comes into contact with a new host
Eg ticks

Question 8

Define use of a vector

Answer 8

-where an organism can carry a disease from human to human

Eg mosquitos carrying plasmodium causing malaria

Question 9

What are the 2 types of parasitic life cycle

Answer 9

• direct life cycle

- indirect life cycle

Question 10

Define direct life cycle

Answer 10

-where eggs are shed and passed onto a new member of the host species

Question 11

Define indirect life cycles

Answer 11

-primary host species is the site for sexual reproduction and throughout the life cycle the parasite becomes adapted to employ a secondary host species which allows these immature parasites to complete their life cycle

Question 12

Define mutualism

Answer 12

• this is where both organisms benefit from the interdependent relationship (one can’t survive without the other)
• one organism provides a service and the other receives a resource
• both organisms provide a service