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8 Cards in this Set
- Front
- Back
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What happens in the carbon cycle?
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1. Carbon is absorbed by plants through photosynthesis, it becomes carbon compounds in plant tissues.
2. Carbon is passed on to primary consumers when they eat plants, passed on to secondary and tertiary consumers when they eat other consumers. 3. When the organisms die, carbon compounds are digested by decomposers. 4. Carbon is returned to the air when decomposers respire. 5. Carbon compounds that aren't digested by decomposers turn into fossil fuels by heat and pressure over millions of years. 6. Carbon in fossil fuels is released when burnt. |
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Effects of global warming on crop yield?
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CO2 is a limiting factor for photosynthesis, therefore increasing CO2 concentration might make crops grow faster, increasing crop yields.
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Effect of global warming on Insect pests?
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1.May effect life cycle of insects, increasing the temperature may mean ones ta go through their larval stage quicker and emerge as adults earlier.
2. •Some species may become more abundant, for example warmer wetter summers have led to an increase in the number of mosquitoes. •less tropic insect species, too hot cannot reproduce successfully. |
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How does global warming effect wild animals and plants? |
1. Could affect distribution of many wild animal and plant species: • Species that need warmer temperatures may spread further because they thrive in exist over a wide area. Vice versa. 2. Could affect number of wild animals and plants: • Some species are more abundant. Boar fish are increasing where temp is rising. • Sea ice is melting, polar bears need sea ice to hunt, low food source, become less abundant |
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Explain the Nitrogen cycle.
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1. Nitrogen fixation
•Gas in the atmosphere is turned into ammonia by bacteria. Ammonia can then be used by plants. •Bacteria found inside root nodules. •Form mutualising relationship with the plant, they provide nitrogen compounds, plant provides carbohydrates. 2. Ammonification: •Nitrogen compounds from dead organisms turned into ammonium compounds by decomposers. •Animal waste contains nitrogen compounds too, these are also turned into ammonium compounds by decomposers. 3. Nitrification •Ammonium compounds in the soil changed into nitrogen. •Nitrifying bacteria changes ammonium compounds into nitrites. •Other bacteria change nitrites into nitrates. 4. Denitrification: •Converted into nitrogen gas by denitrifying bacteria. •Happens under anaerobic conditions. |
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What are the effects of nitrogen fertilisers?
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Reduced species diversity - plants that grow in trogon rich soils outcompete other plants for minerals.
Leaching - lead to pollution of water courses. Eutrophication - caused by leaching fertiliser into watercourses. |
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What are the effects of nitrogen fertilisers?
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Reduced species diversity - plants that grow in trogon rich soils outcompete other plants for minerals.
Leaching - lead to pollution of water courses. Eutrophication - caused by leaching fertiliser into watercourses. |
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How leaching causes eutrophication?
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1.Nitrates leached from fertilised fields stimulate the growth of algae in ponds and rivers.
2. Large amounts of algae block light from reaching the plants below. 3. Plants underneath are unable to photosynthesis and they die. 4. Bacteria feed on dead plant matter. 5. Increased number of bacteria reduce oxygen concentration, aerobic respiration. 6. Fish and other organisms die because there isn't enough dissolved oxygen. |
