7- Populations in ecosystem

Question 1

-Population
-Community
-Ecosystem

Answer 1

• All the organisms of one species found in a habitat
• All the organisms of all the species found in a habitat
  -Community and the abiotic conditions of that area

Question 2

-Species
-Species richness
-Niche
-Carrying capacity

Answer 2

• Organisms that can breed to produce fertile offspring - organisms that share the same niche
• Number of different species with a habitat
• Role of an organism within its habitat
  -Maximum stable population size that an ecosystem can support

Question 3

How to calculate population size using Mark-Release-Recapture method.

Answer 3

Total in sample 1 x Total in sample 2/ Total marked in sample 2

Question 4

Steps in primary succesion

Answer 4

1 - Pioneer species colonise rock / abiotic conditions are hostile / only pioneer species have adaptations that allow them to grow
2 - Pioneer species change environment (die + decompose to make organic matter called humus) making conditions less hostile
3- New species with diff adaptation can move in and grow
4 - At each stage, there is inter- specific competition and better adapted species dominate
5 - Ecosystem becomes more complex and biodiversity increases - Climax community- does not change any further

Question 5

Secondary succession

Answer 5

• Happens when land has been cleared of plants but soil remains