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35 Cards in this Set
- Front
- Back
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What is the formula for photosynthesis |
water + carbon dioxide light glucose + oxygen |
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What is microflora? |
Trillions of bacteria and tiny organisms that live in our digestive systems |
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What are the three main types of flora (micro) |
Beneficial flora, oppurtunistic flora and transitional flora |
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What are decomposers? |
Organisms that break down dead or decaying organisms |
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What is nitrogen used for in the nitrogen cycle? |
To make proteins and DNA |
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How does the greenhouse effect keep our planet warm? |
The greenhouse gases trap the heat in the atmosphere |
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What is the main cause of enhanced greenhouse effect? |
the increased amount of carbon dioxide and gases released |
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Why is enhanced greenhouse gas a concern? |
melting the antarctic ice caps and removing habitats |
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Describe the role of nitrogen-fixing bacteria |
they convert unreactive nitrogen into the air or soil to be absorbed by plants |
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What are pathogenic microbes? |
Microbes that cause disease |
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What do the arrows in food chains and food webs represent? |
the flow of energy through the web/chain |
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How do decomposers return energy to the ecosystem? |
By turning them into chemical nutrients eg. carbon and nitrogen. This is released back into the soil, air and water |
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Some examples of beneficial and harmful bacteria |
beneficial- decomposes dead/decaying organisms (fungi) harmful- they can cause disease (pathogenic) |
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What is a resource? |
anything you use in your everyday life |
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What important resource does Australia lack? |
water |
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What is renewable? |
something that can be restored eg. timber |
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What is non-renewable |
something that can't be restored eg. coal |
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Define food chain |
the sequence of who eats who in a biological community |
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Define food web |
the network of all the interrelated food chains in a biological community |
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Define autotroph |
An organism that makes its food from light or chemical energy without eating |
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Define heterotroph |
An organism that gets its energy by eating other organisms |
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Define primary consumer |
an organism that eats autotrophs |
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Define Secondary Consumers |
an organism that eats primary consumers |
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Define Tertiary consumers |
an organism that eats secondary consumers |
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Define quaternary consumer |
an organism that eats tertiary consumers |
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What is the ultimate energy for all life on earth |
Sun |
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What are two types of food making processes? |
photosynthesis and chemosynthetic bacteria |
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Where do chemosynthetic bacteria get their energy? |
hypothermic vents |
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What is trophic level |
the position an organism holds in a food chain/web |
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what is the second trophic level |
primary consumers/herbivores |
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example of 3 detrivores |
worms , vultures and crabs |
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Dependent variable |
a variable that is expected to change when the independent variable is changed. The dependent variable is observed or measured during the experiment. |
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Inderpendent Variable |
the variable that the scientist changes to observe its effect on another variable |
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Controled Variable |
the conditions that must be kept the same throughout the experiment |
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Green House Gasses |
The primary greenhouse gases in Earth's atmosphere are water vapor, carbon dioxide,methane, nitrous oxide, and ozone. |
