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Preview to Threats to Biodiversity Habitat Destruction Invasive Species Pollution Deforestation But before we get there, we need to know our cycles:. Carbon, hydrogen, oxygen, nitrogen are recycled throughout our planet Mr. Narez. NITROGEN CYCLE:
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Preview to Threats to Biodiversity • Habitat Destruction • Invasive Species • Pollution • Deforestation But before we get there, we need to know our cycles:
Carbon, hydrogen, oxygen, nitrogen are recycled throughout our planetMr. Narez
NITROGEN CYCLE: We need nitrogen because amino acids (proteins) are made of nitrogen. • Problem: Plants cannot use nitrogen gas (N2) found in the atmosphere. • Solution: Bacteria or lightning strikes convert or “fix” N2 gas into nitrites (NO2-) and then into nitrates(NO3-). This is called nitrogen fixation or nitrification. A nitrate is a form of nitrogen that can be used by plants. • Waste from animals and the decay of dead plants and animals leads to a increase in ammonia (NH3) in soil. Bacteria in soil or in the root nodules of plants convert ammonia to nitrite to nitrate. • Some bacteria use nitrate instead of oxygen for cell respiration (to make ATP), but they release N2 back into the atmosphere.
Wednesday, Feb 27 Objective: IWBAT understand how carbon cycles by participating in carbon passport activity. ANSWER only please: If we can’t use nitrogen gas from the atmosphere, then how do plants get the nitrogen in a form that they can use? (HINT: The process is called nitrification)
Water Cycle (Hydrologic cycle) • Water evaporates into the air when temperatures are high (evaporation). • As moist air rises and cools, water condenses forming clouds (condensation). • When too much vapor condenses, the water returns to the earth’s surface in the form of either rain, snow, or hail (precipitation). • Water runs over to lakes, rivers, oceans, and through groundwater below the soil (Runoff). • Plants can also release water in the form of vapor from their pores (transpiration).
Carbon Cycle • Plants absorb CO2 from the atmosphere during photosynthesis to make food/sugars/carbs. • Decomposers break down dead waste and consume the carbon in the waste. • Most living things even plants undergo cellular respiration to make ATP, but releases CO2 into the atmosphere. • Deforestation (cutting down trees) leads to an increase in CO2 in the atmosphere. • Burning fossil fuels like coal, oil, gasoline to make fuel means releasing more CO2 into the air. • Carbon is stored in the oceans as dissolved CO2, when temperatures rise, carbon gets released back into the air. • Volcanoes release CO2
My Carbon Cycle Passport • POOF! You are now a carbon atom. • You will follow the carbon cycle and move through the environment as a carbon atom! • You record your travels in a passport!
Write the title on the front page. (pg. 1) • Write your start point and draw a picture. • Your start point is the station closest to your seat.
At your “start” station, randomly choose a number from the cup and follow the directions. • Here is an example: • I started in the atmosphere. • I picked #1. • I am going to plant! • Go to the PLANT station. • On page 2 of your passport, write Trip # 1. • Write “I have arrived at plant.” • Draw a picture of a plant.
Read the directions of the new station. • Choose a number and follow the directions. • Here is an example: • I am at at the plant. • I choose the number 4. • Write “I am going to deer because a deer ate the plant that I am in.”
Go to the deer station. • On page 3 of your passport, write Trip #2. • Write I have arrived at deer. • You will continue to move from station to station based on the numbers you pick from the cups and the directions from each station.
