2.2 Bio

Question 1

What factors affect population growth.

Answer 1

Births, immigration, deaths and emmigration

Question 2

What are the two types of models of population growth.

Answer 2

Exponential and logistical

Question 3

What do the two models look like?

Answer 3

exponential curve and logistical is one where the curve levels off at an equal rate to the initial curve.

Question 4

What does N, N0, K, r, t, and dN/dT stand for?

Answer 4

N=population, N0 is starting population. K is carrying capacity, r is max per Capita growth rate, t is time, and dN/dT is the rate of growth overall in the population.

Question 5

What is the equation for logistical growth?

Question 6

What is the equation for exponential growth?

Question 7

What is a density dependent factor what is an independent one?

Answer 7

dependent is typically biotic and affects pop when size is big.
Independent is typically abiotic will always affect population ie natural disaster.

Question 8

What happens in both exponential and logistical graphs when k is increased or decreased

Answer 8

Exponential graphs do not have a carrying capacity so nothing would change. A logistical graph would continue in its usual pattern, slowing down at 1/2 the carrying capacity.

Question 9

What happens in both exponential and logistical graphs when r is increased or decreased

Answer 9

if r is increased then the pop will grow quicker and vice versa if reduced.

Question 10

What happens in both exponential and logistical graphs when N0 is increased

Answer 10

The population will grow quicker in exponential and start mid-way through a normal logistical graph. unless over k then decreases exponentially.