Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
How Ecosystems Work
| Question | Answer |
|---|---|
| these organisms get energy indirectly from the sun | consumers |
| consumers are sometimes called | heterotrophs |
| Which of the following is correctly arranged from the lowest trophic level to the highest trophic level? a. bacteria, frog, eagle, mushroom b. algae, deer, wolf, hawk c. grass, mouse, snake, eagle d. grass, bass, minnow, snake | grass, mouse, snake, eagle |
| Communities of bacteria have been found living thousands of feet underwater. How is this possible? | They use an energy source other than sunlight |
| Which of the following pairs of organisms probably belong to the same trophic level? a. humans and bears b. bears and deer c. humans and cows d. both (a) and (c) 14. | human and bears |
| The energy lost between trophic levels is used in the course of ___________ | normal living |
| From producer to secondary consumer, about what percentage of energy is lost? | 10% |
| Decomposers break down waste to yield _____________ which can later be converted into nitrates for plants to use. | ammonia |
| An example of a pioneer organism on an area of bare rock would be | lichens |
| Excessive use of fertilizer that contains nitrogen and phosphorus may ____________________ | cause algal blooms in waterways leading to a depletion of oxygen in the water |
| ________________ is a gradual process of change and replacement of the types of species in a community. | Ecological succession |
| ____________ is a type of succession that occurs on a surface where no ecosystem existed before. | Primary succession |
| ___________________ occurs on a surface where an ecosystem has previously existed. | Secondary succession |
| Due to volcanic activity, the plant life can be totally destroyed. What are the plants that are the first to begin to colonize the volcanic debris. | pioneer species |
| The final stage in ecological succession that produces a final and stable community is called ________________ | climax community |
| Why is primary succession much slower than secondary succession? | primary succession begins where there is no soil. It take several hundred to several thousand years to produce fertile soil naturally. |
| A ________________ is a producer that is composed of two species, a fungus and alga. | lichen |
| The process by which carbon is transferred between the atmosphere, land, water, and organisms is called ________. | carbon cycle |
| ___________________ are essentially stored carbon left over from bodies of plants and animals that died millions of years ago. | fossil fuels |
| What happens to the carbon dioxide produced by the burning of fossil fuels and forest fires? | A portion of the carbon dioxide is absorbed into the atmosphere, dissolved into the ocean and used by plants in photosynthesis. |
| The only organisms that can fix atmospheric nitrogen into chemical compounds a few species of bacteria known as ____________ | nitrogen-fixing bacteria |
| The nitrogen-fixing bacterial live on the roots of plants called __________ | legumes |
| Why are decomposers essential in the nitrogen cycle? | they break down wastes, urine, dung, leaves, and other decaying plants and animals and return the nitrogen that these wastes and dead organism contain to the soil. |
| Every time one organism eats another organism, a ___________________________ occurs | transfer of energy |
| Food chains, food webs, and trophic levels can tell us how _______________ as well how much _____________. | energy is transferred, energy is transferred. |
| A ____________________ is a sequence in which energy is transferred from one organism to the next as each organism eats another organism. | food chain |
| A ________________ shows many feeding relationships that are possible in an ecosystem. | food web |
| Each time energy is transfer trough a food chain or food web in an ecosystem is known as a ______________. | trophic level |
| Each time energy is transferred from one organism to another some of the energy is lost. What are ways in which this energy is lost? | Energy is used by the organism in cellular respiration, some is used to carry out the functions of living and in the form of heat. |
| The _________________ shows how energy is lost from one trophic level to the next. | energy pyramid |
| Why do ecosystems have rarely than four or five trophic levels? | Due to the fact that energy is decreasing in each step of energy transfer, the ecosystem does not have enough energy left to support higher levels. |
Created by:
johnwhitfield35125
Popular Biology sets