CH18/19

Question 1

define organism

Answer 1

all living things in an area

Question 2

define population

Answer 2

all members of a species in an area

Question 3

define community

Answer 3

all living things in an area

Question 4

define ecosystem

Answer 4

all living and nonliving things in an area

Question 5

define biosphere

Answer 5

all ecosystems interacting together

Question 6

define producer

Answer 6

autotrophs who make their own food (from the sun)

Question 7

define consumer

Answer 7

heterotroph (eat other organisms around them in the environment)

Question 8

define decomposer

Answer 8

bacteria and fungi that break down dead matter

Question 9

define niche

Answer 9

the roles that every organism/animal plays in an ecosystem

Question 10

what does a J curve represent

Answer 10

logistical growth models represent a population growth with no restrictions

Question 11

what does a S curve represent

Answer 11

exponential growth models represent a population growth with a restricting factor

Question 12

what are three problems with allowing a population to get too small

Answer 12

1. one natural disaster can wipe out the whole population
2. inbreeding and decreased genetic diversity
3. food chains/webs get messed up other populations

Question 13

how do you calculate the growth rate of a population

Answer 13

birth and death rate