U1.1

Question 1

It is the living together in close association of two or more different organisms. It is a relationship between two organisms (called symbionts) in which at least one is dependent on the other; or both may be mutually benefitted. Microorganisms can associate themselves with other organisms in a variety of ways.

Answer 1

Symbiosis

Question 2

(Gk. sym — together; bios — life)

Answer 2

Symbiosis

Question 3

Symbiosis: nature of association?
- a type of symbiosis that benefits both organism
- oftentimes an obligatory relationship in a sense that
the smaller symbiont called the mutualist and the larger symbiont, referred to as the host are dependent on each other

Answer 3

Mutualism

Question 4

Mutualism:
- smaller symbiont?

Answer 4

mutualist

Question 5

Mutualism:
- larger symbiont?

Answer 5

host

Question 6

Symbiosis: nature of association?
- an association of two organisms where one symbiont (usually smaller, called commensal) benefits while the other organism (called host), is neither harmed nor helped.

Answer 6

Commensalism

Question 7

Symbiosis: nature of association?
- L. mūtuus — reciprocal

Answer 7

Mutualism

Question 8

Symbiosis: nature of association?
- L. com — together; mensa — table or meal — “sharing a
table”

Answer 8

Commensalism

Question 9

Symbiosis: nature of association?
- is a relationship in which one organism, usually smaller, called parasite, benefits while the other usually larger, called the host is harmed. Many pathogenic bacteria are considered as parasites.

Answer 9

Parasitism

Question 10

Symbiosis: nature of association?
- Gk. para - beside; sitos - wheat — food

Answer 10

Parasitism