Ecosystems Homework Practice
| # | Answer |
|---|---|
| 1 | An ecosystem is a community of living things and the nonliving environment they interact with. |
| 2 | A living part of an ecosystem is called a biotic factor, such as a plant or animal. |
| 3 | A nonliving part of an ecosystem is called an abiotic factor, such as water, sunlight, or soil. |
| 4 | A tree is a biotic factor. |
| 5 | Sunlight is an abiotic factor. |
| 6 | A habitat is the place where an organism lives. |
| 7 | A niche is the role an organism plays in its ecosystem. |
| 8 | A producer example is grass, algae, or a tree. |
| 9 | A consumer example is a rabbit, deer, or hawk. |
| 10 | A decomposer example is a fungus or bacteria. |
| 11 | Producers make their own food, usually through photosynthesis. |
| 12 | Plants take in carbon dioxide during photosynthesis. |
| 13 | Plants release oxygen during photosynthesis. |
| 14 | A food chain is a sequence that shows how energy moves from one organism to another. |
| 15 | The Sun is the first source of energy for most ecosystems. |
| 16 | Producers are at the base of most food chains. |
| 17 | Herbivores eat plants. |
| 18 | Carnivores eat other animals. |
| 19 | Omnivores eat both plants and animals. |
| 20 | A food web is a network of connected food chains in an ecosystem. |
| 21 | Food webs are more realistic because most organisms have more than one food source and more than one predator. |
| 22 | Less energy is available at each higher level. |
| 23 | A trophic level is a feeding level in a food chain or food web. |
| 24 | The producer level usually has the most energy available. |
| 25 | Ecological succession is the gradual change in an ecosystem over time. |
| 26 | A population is one species in an area, while a community includes all the different populations living together. |
| 27 | A limiting factor is anything that restricts the size of a population. |
| 28 | Examples include food, water, space, predators, or disease. |
| 29 | Carrying capacity is the largest population an environment can support over time. |
| 30 | A drought can reduce water availability and lower the survival of plants and animals. |
| 31 | Decomposers break down dead organisms and return nutrients to the soil or water. |
| 32 | Nutrients help organisms grow and support the cycling of matter in ecosystems. |
| 33 | The carbon cycle is the movement of carbon through living things, the atmosphere, water, and soil. |
| 34 | The water cycle is the movement of water through evaporation, condensation, precipitation, and collection. |
| 35 | Biodiversity is the variety of living organisms in an ecosystem or on Earth. |
| 36 | Biodiversity helps ecosystems stay healthy, stable, and resilient to change. |
| 37 | An invasive species is a nonnative organism that spreads quickly and can harm an ecosystem. |
| 38 | Pollution can damage habitats, harm organisms, and reduce ecosystem health. |
| 39 | Wetlands provide habitat, filter water, and help reduce flooding. |
| 40 | Energy flows one way through ecosystems, while matter is recycled through cycles. |