3.5 PopulationSize & Ecosystems

Question 1

population

Answer 1

number of individuals (of the same species) within a given area

Question 2

community

Answer 2

2 or more populations of species within an ecosystem

Question 3

habitat

Answer 3

the physical environment where a particular community a population lives

Question 4

environment

Answer 4

conditions that surround an organism (biotic+abiotic)

Question 5

biotic

Answer 5

any living factor which affects another organism/species in any way

Question 6

abiotic

Answer 6

non living part of the environment that can affect organisms (chemical+physical)

Question 7

biotic factors

Answer 7

• food competition/availability
• disease
• resource/habitat competition
• predation

Question 8

abiotic factors

Answer 8

• light intensity
• temperature
• pH
• wind+moisture
• salinity
  -CO2/O2 conc

Question 9

ecosystem

Answer 9

a dynamic biological community that is made up of biotic+abiotic components

Question 10

niche

Answer 10

role of an organism in the ecosystem (prey/preditor)

Question 11

dispersion

Answer 11

how geographically spaced out organisms are

Question 12

fecundity

Answer 12

number of offspring an individual can have in a lifetime

Question 13

name 4 limiting factors

Answer 13

• food
• temperature
• mates
• space

Question 14

carrying capacity

Answer 14

number of individuals a habitat can sustain

Question 15

growth rate =

Answer 15

(births - death)/original pop size

Question 16

what factors alter density

Answer 16

births/deaths and immigration/emigration

Question 17

density dependant

Answer 17

affects population on size
(larger pop = larger death rate)

Question 18

density independent

Answer 18

affects death rate regardless of population
(disastrous events)