Question

name
limiting factors and carrying capacity
when living conditions in an area are good, a population will generally grow. but eventually some environmental factor will cause the population to stop growing. a limiting factor is an environmental factor that causes a population to decrease. some limiting factors for populations are food and water, space, and weather conditions.

1. what is a limiting factor? (answer in a complete sentence by restating the question)
2. are the limiting factors abiotic or biotic factors (or both)? explain why.

food and water
organisms require food and water to survive. since there isnt always an endless amount of food and water, they are limiting factors. suppose a bear must eat 10 fish a day to survive. the river nearby provides about 100 fish a day without harming the fish population. five bears could easily live in this area because they would only need 50 fish total. but if there were 15 bears they would not all survive because there would not be enough food. no matter how much shelter and water there was, the population would not get larger than 10 bears for any extended period of time.

1. how can food availability limit bear population growth?
2. plants use photosynthesis to transform sunlight into sugar. what would limit this process in plants?
3. another limiting factor is waste produced by animals. this waste can cause water to become polluted, and promote dangerous algae growth. why would too much algae pose a risk to fish?
4. what would be limiting factors for plant growth?

Explanation:

1. A limiting factor is an environmental factor that causes a population to decrease.
2. Limiting factors can be both abiotic (e.g., weather conditions) and biotic (e.g., food availability). Abiotic factors are non - living components of the environment, while biotic factors are living or once - living components. For example, food (biotic) and water (abiotic) are both limiting factors.
3. Food availability limits bear population growth because if there is not enough food (e.g., fish for bears), not all bears in the population can survive. As shown in the example, 15 bears would not all survive as there are only 100 fish a day and each bear needs 10 fish (15 bears would need 150 fish).
4. Factors that would limit photosynthesis in plants include lack of sunlight (as it is the energy source for photosynthesis), lack of water (a reactant in photosynthesis), and lack of carbon dioxide (another reactant).
5. Too much algae poses a risk to fish because algae can deplete oxygen in the water as they decompose. Fish need oxygen to survive, so a decrease in oxygen levels due to excessive algae growth can be harmful.
6. Limiting factors for plant growth include availability of water (needed for various plant processes), sunlight (for photosynthesis), nutrients (e.g., nitrogen, phosphorus, potassium from the soil), and space (to grow roots and leaves without overcrowding).

Answer:

1. A limiting factor is an environmental factor that causes a population to decrease.
2. Limiting factors can be both abiotic and biotic. Abiotic (e.g., weather) are non - living; biotic (e.g., food) are living/once - living.
3. If not enough food (e.g., fish for bears), not all bears survive (e.g., 15 bears need 150 fish, only 100 available).
4. Lack of sunlight, water, or carbon dioxide.
5. Algae decomposition depletes oxygen; fish need oxygen.
6. Water, sunlight, nutrients, space.