Unit 3 Key Area 5

Question 1

define the term symbiosis?

Answer 1

Symbiosis is co-evolved intimate relationships between two members of different species

Question 2

What are the two types of Symbiotic relationships?

Answer 2

• parasitism
• mutualism

Question 3

describe the features of a parasitic relationship?

Answer 3

In a parasitic relationship the parasite benefits in terms of energy from resources obtained from the host and the host is harmed by the loss of these resources.

Parasites often have a limited metabolism and cannot survive outside of their hosts. However some parasites have intermediate secondary hosts to allow them to complete their life cycle

Question 4

What are the methods of transmission of parasites?

Answer 4

Parasites can be transmitted by
- Vectors
- Resistant stages
- Direct contact

Question 5

Describe the features of a mutualistic relationship?

Answer 5

In a mutualistic relationship both partner species benefit in an independant relationship.