What is symbiosis entrance test SET

Ecosystem II
 
symbiosis

Exercise 8

Tick ​​the correct answers!
  1. What is symbiosis?
    1. A relationship between individuals of different species in which both have an advantage.
    2. A relationship between individuals of a species living together in an area to form a reproductive community.
    3. A relationship between individuals of a species in which both are at a disadvantage.
  2. What is an obligatory symbiosis?
    1. The two partners can only exist together, they are not able to survive on their own.
    2. The two partners cannot exist together, they can only survive on their own.
    3. The different individuals of a population have the same demands on the environment and are therefore only able to survive on their own.
  3. What is an optional symbiosis?
    1. The two partners are each able to survive on their own, but together they thrive better and / or can reproduce better.
    2. The two partners cannot survive alone. They can reproduce better in a group.
    3. The two partners are each able to survive on their own, but together they cannot thrive and multiply.