19.2 Variation in population size

Question 1

why is logarithmic scale is necessary in some graphs

Answer 1

allows us to differentiate each point

Question 2

abiotic factors that influence the size of a population-

Answer 2

temperature
light
ph
water and humidity

Question 3

how does temperature influence population size

Answer 3

further away from the optimum temperature
fewer individuals in a population able to survive
smaller the population that can be supported
(enzymes)

Question 4

how does light influence population size

Answer 4

rate of photosynthesis increases as light intensity increases
plants grow faster. more seeds/spores
carrying capacity is greater
carrying capacity of animals that feed on plants larger

Question 5

how does PH influence population size

Answer 5

affects action of enzymes
population larger around optimum PH
smaller/non-existent PH different from optimum

Question 6

how does water and humidity influence population size

Answer 6

affects transpiration rate in plants and evaporation of water from bodies of animals

Question 7

summary of how abiotic factors affect population size

Answer 7

when any abiotic factor is below the optimum for a population
fewer individuals able to survive because their adaptations are not suited to conditions
no individuals have adaptations that allow survival= extinction