Population
What is a population?
A group of organisms of the same species which live in the same area.
How does population size change?
It changes over time.
What is the difference between birth rate and death rate?
Birth rate is the number of births in a population, while death rate is the number of deaths.
What is population size?
The number of individuals in the population.
What effect do immigrants have on population?
They increase the population size.
Describe exponential growth.
A type of growth that occurs when resources are unlimited, leading to rapid increase in population size.
What factors increase population size?
Birth rate and immigrants.
How is population growth defined?
If the birth rate is greater than the death rate, the population will increase.
What is a sigmoid growth curve?
A growth curve that starts off exponential, but levels off as the population reaches carrying capacity, forming an S-shape.
What are emigrants?
Organisms that move out of the population.
What is a population growth curve?
A graph that represents the change in population size over time.
What limits population growth?
Factors such as food availability, space, and environmental conditions
What is carrying capacity?
The number of organisms which a region can support without environmental degradation.
What does a J-shaped curve represent?
It shows that population size is increasing rapidly, usually when resources are abundant.
How does carrying capacity affect population growth?
It is the maximum population size that an environment can sustain, thus limiting growth when reached.