Population size Flashcards
Factors affect population size. What are living factors referred to as?
Biotic
Factors affect population size. What are non-living factors referred to as?
Abiotic
What makes up environmental resistance?
Factors that affect population growth and size.
What biotic factors affect population growth?
- Food
- Predators
- Competitors
- Disease
What abiotic factors affect population growth?
- Temperature
- Oxygen availability
- Light availability
- Toxins and pollutants
What will an environment eventually reach due to population growth?
The population will eventually reach it’s carrying capacity
How are human populations counted?
They are counted directly, rather than by sampling. This is called a census.
What does a population pyramid show?
A population pyramid shows age structure of a population.
What is age group structure affected by?
- Food availability
- Hygiene
- Medical provision
- Working conditions
- Political instability
What is biomass?
Biomass is the number of organisms multiplied by their weight.
What is the definition of generation time?
The length of time it takes for a population of cells to double.
