Grade 12 IEB Life Science
Study online at https://quizlet.com/_e00yv2
1. Individual a single organism that forms apart of a species
2. Population a group of organisms of the same species populating a given area and can
crossbreed
3. Community a group of populations occurring in a particular area
4. Ecosystem unit of plant and animal communities in interaction with each other and the
non-living factors in an area
5. When does popu- seasonally & annually depending on the availability of resources
lation size fluctu-
ate
6. density indepen- factors affecting mortality and natality are not related to pop density
dent factors - climate
-environmental disaster
- pollutants
7. density depen- limiting factor that depends on population size
dent factors -lack of food & water
- lack of space
- lack of shelter
8. Environmental The total number of factors that stop a population from reproducing at its maxi-
resistance mum rate. Limiting factors build up this.
9. carrying capacity the largest population that an environment can support at any given time
(name the 2 - stable population
kinds) fluctuates around CC
-unstable population
habitats deteriorate
10. Direct method
1/7
, Grade 12 IEB Life Science
Study online at https://quizlet.com/_e00yv2
Counting every single individual in pop. CENSUS. Organisms=large. Area=not too
large. Individuals=slow, stationary, stay in fixed position. Area too large=aerial pics,
helicopters.
11. Quadrat Method Counting no. individuals in quadrats, using no. calculate pop size of total are.
of Estimating N=average number in sample x size of whole habitat/size of quadrat
Populations
12. Mark-recapture Individuals caught and marked, released. Another sample captured, number of
method marked individuals counted. Animals: mobile, not easily visible.
P=M x C/R
M=total number marked animals initially
C=total number of animals caught in 2nd sample
R=total number of marked animals in 2nd sample
13. What is a preda- a biological interaction between the organism that hunts and kills for food (preda-
tor-prey relation- tor) and the organism that serves as its source of food (prey)
ship?
14. PPR Aphid-lady- 1)Aphid - prey
bug -Garden pests that suck plant sap releases honeydew that makes black fungus
grow
-Transfer viral diseases and toxins into plant
2)Ladybug - predator
- can eat 1000 aphid a day
- biological control
15. PPR lion-zebra 1) Zebra - prey
- day: grassland grazer to detect predator
2/7
Study online at https://quizlet.com/_e00yv2
1. Individual a single organism that forms apart of a species
2. Population a group of organisms of the same species populating a given area and can
crossbreed
3. Community a group of populations occurring in a particular area
4. Ecosystem unit of plant and animal communities in interaction with each other and the
non-living factors in an area
5. When does popu- seasonally & annually depending on the availability of resources
lation size fluctu-
ate
6. density indepen- factors affecting mortality and natality are not related to pop density
dent factors - climate
-environmental disaster
- pollutants
7. density depen- limiting factor that depends on population size
dent factors -lack of food & water
- lack of space
- lack of shelter
8. Environmental The total number of factors that stop a population from reproducing at its maxi-
resistance mum rate. Limiting factors build up this.
9. carrying capacity the largest population that an environment can support at any given time
(name the 2 - stable population
kinds) fluctuates around CC
-unstable population
habitats deteriorate
10. Direct method
1/7
, Grade 12 IEB Life Science
Study online at https://quizlet.com/_e00yv2
Counting every single individual in pop. CENSUS. Organisms=large. Area=not too
large. Individuals=slow, stationary, stay in fixed position. Area too large=aerial pics,
helicopters.
11. Quadrat Method Counting no. individuals in quadrats, using no. calculate pop size of total are.
of Estimating N=average number in sample x size of whole habitat/size of quadrat
Populations
12. Mark-recapture Individuals caught and marked, released. Another sample captured, number of
method marked individuals counted. Animals: mobile, not easily visible.
P=M x C/R
M=total number marked animals initially
C=total number of animals caught in 2nd sample
R=total number of marked animals in 2nd sample
13. What is a preda- a biological interaction between the organism that hunts and kills for food (preda-
tor-prey relation- tor) and the organism that serves as its source of food (prey)
ship?
14. PPR Aphid-lady- 1)Aphid - prey
bug -Garden pests that suck plant sap releases honeydew that makes black fungus
grow
-Transfer viral diseases and toxins into plant
2)Ladybug - predator
- can eat 1000 aphid a day
- biological control
15. PPR lion-zebra 1) Zebra - prey
- day: grassland grazer to detect predator
2/7
