Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Nitrogen Cycle Game Questions • When does nitrogen leave the air? ▫ Through lighting strikes or fire ▫ Bacteria • When does water carry nitrogen? ▫ Dissolved water • When do animals lose nitrogen? ▫ Waste ▫ Die • How do animals get nitrogen? ▫ Eat other animals and plants that contain nitrogen. Nitrogen Cycle 2013 Nitrogen Cycle bioh.wikispaces.com Importance of Nitrogen • Allows plants and animals to make amino acids, proteins and DNA ▫ Amino acids: use to make proteins ▫ Proteins: made of C, H, N, and other elements, involved in almost all cell functions Forms: antibodies, contractile-movement, enzymes, storage, structural support ▫ DNA: genetic coding to direct the development and functions of cells. How Nitrogen Moves • Move from atmosphere to Plants ▫ Fire, lightning, and nitrogen-fixing bacteria ▫ Changes it from N2 to the form which plants can use: ammonium ion (NH4+) and nitrate (NO3-) ▫ Bacteria live in the soil and on the roots of plants, which then provides nitrogen to the plants • Plants to Animals ▫ Food Chain: Producers to consumers • Plants and animals to soil ▫ Animal waste ▫ Decay of organisms • Plants and animals to atmosphere ▫ Decay of organisms Human impact on the Nitrogen Cycle • Humans add too much nitrogen which off balances the cycle ▫ Nitrogen-rich fertilizer and livestock waste • Affect: ▫ Increase nitrate (form of nitrogen) causes plants to grow fast until they use up the supply and die ▫ Increase in plants = increase in consumers and when the plants all die so do the consumers Nitrogen Cycle Question • Which letters on the cycle shows where nitrogen is being “fixed” into a useable form for plants? ▫ ▫ ▫ ▫ A. B. C. D. A, D B, C C, D A, B Nitrogen Cycle Question • How do plants get the nitrogen they require for growth? ▫ A. the process of photosynthesis creates nitrogen from sugar ▫ B. by absorbing it from holes in their leaves and combining it with oxygen ▫ C. a symbiotic relationship with bacteria that “fixes” nitrogen in the roots ▫ D. nitrogen from the air attaches itself to the stem and leaves of plants. Nitrogen Cycle Question • Which of the following best explains why animal manure can be used as a fertilizer for crops and gardens? The plant uses the ▫ A. carbon from the dead plant matter to make sugar ▫ B. nitrogen to make proteins and DNA ▫ C. oxygen for cellular respiration ▫ D. hydrogen to form sugars Carbon Cycle Question • Which place on the nitrogen cycle shows nitrogen in its LEAST useable form? ▫ ▫ ▫ ▫ A. B. C. D. A B C D