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2-1: Logistic Growth
Logistic growth of a population
| Term | Definition |
|---|---|
| biotic | Living parts of an environment, like plants, animals, bacteria, and fungi. |
| abiotic | Non-living parts of an environment, like sunlight, water, air, and temperature. |
| carrying capacity | The largest number of organisms an environment can support without running out of resources. |
| ecosystems | Communities of living things (biotic) and non-living things (abiotic) that interact in a specific area. |
| resources | Things organisms need to survive, like food, water, shelter, and space. |
| climate | The usual weather conditions in a place over a long period of time, including temperature, rainfall, and wind. |
| competition | When organisms fight or struggle for the same resources, like food or space, in an environment. |
| producer | a living thing, like a plant, that makes its own food using sunlight. Producers are the first step in a food chain. |
| Gas molecule density | how many gas particles are packed into a certain space. More molecules in a space means higher density. |
| Altitude | how high something is above sea level. The higher the altitude, the thinner the air. |
| Atmospheric pressure | the weight of the air pressing down on Earth. It gets lower as you go higher in altitude. |
| Sea level | the average height of the ocean’s surface. It’s used as a starting point to measure elevation and altitude. |
| Water vapor | water in the form of a gas. It’s part of the air and can turn into clouds and rain. |
| Elevation | the height of land above sea level. Mountains have high elevation, and valleys have low elevation. |
| Erosion | when wind, water, or ice wears away rocks and soil and moves them to a new place. |
| Moisture | the amount of water in the air or in something like soil or food. |
| pest | an animal or insect that harms crops, animals, or people, like locusts or mosquitoes. |
| Rangeland | open land where animals like cows or sheep can graze. It’s not usually used for growing crops. |
| Cropland | land used to grow food and other plants for people and animals. |
| Urban development | the building of cities, roads, and houses where there used to be natural land or farms. |
| Fluctuation | a change that goes up and down, like temperature or prices that don’t stay the same. |
| Depletion | using something up until there’s not much left, like when too many trees are cut down or water runs low. |
| Preservation | protecting nature, animals, or resources so they stay safe and healthy for the future. |
| population | a group of individuals of a single species that occupies the same general area |
| birth and immigration | Factors that increase the size of a population |
| death and emigration | Factors that decrease the size of a population |
| exponential growth | the rate of population increase under ideal conditions |
| logistic growth | a population whose growth is slowed by limiting factors as the population size increases |
| Limiting factors | Things in the environment that control how big a population can grow, such as food, water, space, or weather. |
| “boom-and-bust” cycles | fluctuations in population due to food shortages and surpluses |
| sustainable resource management | harvesting crops and animals while maintaining a high growth rate to replenish the population |
| Developed countries | Countries that have strong economies, advanced technology, and a high standard of living, such as good healthcare and education systems. |
| Developing countries | Countries that are still working to improve their economy, industry, and living conditions, often with less access to healthcare and education. |
| ecological footprint | an estimate of the amount of land required to provide the raw materials an individual or a nation consumes, including food, fuel and housing |
| Family planning | The practice of deciding how many children to have and when to have them, often using education and methods like birth control. |
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