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Topic 9 Lesson 3
| Question | Answer |
|---|---|
| In Virginia, every 17 years a ________ emerges from the ground to feed and mate. | Cicada |
| ___________REFERS TO A SERIES OF CHANGES IN AN ECOSYSTEM | Succession |
| When plants and animals start living on ______ land, the process is called primary succession. | new |
| When plants/animals return to disturbed/damaged land, the process is called _______________ succession. | secondary |
| Within 1-4 years after a fire producers such as weeds, __________, and flowering plants grow back because they are producers that can make their own food | grasses |
| - When plants and animals start living on new land, the process is called ____________ succession. | primary |
| Within 1-4 years after a fire producers such as weeds, grasses, and flowering plants _______ back because they are producers that can make their own food | grow |
| REMINDER: PLANTS ARE _________________ & ALL ORGANISMS NEED A SUFFICIENT AMOUNT OF PRODUCERS TO SURVIVE | producers |
| A __________ecosystem meets the needs of multiple kinds of species/organisms from year to year, where conditions (like # of species) only changes | slightly |
| Competition occurs when organisms in an ecosystem need the same _______________ to survive | resources |
| A __________ecosystem meets the needs of multiple kinds of species/organisms from year to year, where conditions (like # of species) only slightly changes | stable |
| ______________ ecosystems might occur if there is a new plant or animal species introduced to an ecosystem. | unstable |
| Healthy ecosystems have good shelters/nesting sites, a balance of ___________, & enough air/water/nutrients. | species |
| Threats include habitat _____, new species’, a growing human population, overfishing, pollution, & drought. | loss |
| Threats include habitat loss, new species’, a growing human population, overfishing, __________, & drought. | pollution |
| The number of individuals of each species in a stable ecosystem may __________a bit over time as conditions change slightly. | change |
| In summer, the number of water plants in a lake may be much ____________than the number of individuals of a fish species that eats them. | larger |
| In winter, the number of water plants may ____________, but the number of fish species may remain about the same. | decrease |
| In any __________________, organisms compete. | ecosystem |
| If an ecosystem changes, is it unhealthy? ( Must know full answer- Discussion question) | No, an ecosystem can change and remain healthy if it can still meet the needs of the species living there. |
| List two characteristics of a healthy ecosystem? | 1. adequate shelter and nesting sites 2. balance of decomposers, producers, and consumers 3. a variety of species 4. adequate supply of clean air, water, and nutrients |
| List two threats to a healthy ecosystem? | 1. habitat loss due to human action and natural events such as forest fires 2. introduced species that crowd out other species 3. rapidly growing human population 4. overfishing or overharvesting 5. pollution 6. drought |
| movement | transfer |
| a series of changes in a community of an ecosystem | succession |
| when two or more organisms need the same limited resource to survive | competition |
| steady or unchanging | stable |
| a series of events or processes that repeats over and over | cycle |
Created by:
freelandjamie
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