Science Grade 6Chapter 5: Cycles in the Biosphere : Science Grade 6Chapter 5: Cycles in the Biosphere Lesson 1: How Do Oxygen and Carbon Dioxide Cycle?
Page B6
Compare : Compare Photosynthesis It is the process in which plants use energy from the sun to change carbon dioxide and water into sugar and oxygen
CO2 + Water + Sun Energy ? Glucose + O2 Respiration It is the process in which oxygen and sugar combine to produce carbon dioxide and water, while releasing the stored energy
Glucose + O2 ?CO2 + Water + Energy Think of photosynthesis and respiration as opposite processes. Plants produce oxygen that animals need and animals produce carbon dioxide that plants need.
The relationship between photosynthesis and respiration : The relationship between photosynthesis and respiration
2 minute class work : 2 minute class work Why is respiration necessary for both plants and animals? They both use the process to release energy stored in sugar
Carbon Cycle and Oxygen Cycle : Carbon Cycle and Oxygen Cycle Both CO2 and O2 cycle between the air, the ground, and living things.
Diagram on B8 and B9
CARBON CYCLECarbon is a part of all living things and flows through the carbon cycle mainly as CO2 gas : CARBON CYCLECarbon is a part of all living things and flows through the carbon cycle mainly as CO2 gas
OXYGEN CYCLEOxygen is a must for life. Oxygen gas makes up about 21% of the air in the earth's atmosphere. Green plants are key to keeping the oxygen cycle going. : OXYGEN CYCLEOxygen is a must for life. Oxygen gas makes up about 21% of the air in the earth's atmosphere. Green plants are key to keeping the oxygen cycle going.
5 minute class workDraw the Cycles : 5 minute class workDraw the Cycles Draw on a piece of a paper the following items, an animal, a plant, ground, a car and a factory.
Draw arrows going in or out of the items to explain what gas it produces and what gas it takes in.
Example, the ground has bacteria to decompose dead living things, so it needs to take in oxygen and produces carbon dioxide. Oxygen Carbon dioxide Oxygen Carbon dioxide Tree Ground
Slide 9 : Factory burns fossil fuel CO2 O2 Tree during photosynthesis O2 CO2 Ground contains microorganisms to break down dead living things O2 CO2 CO2 O2 Animal during respiration O2 CO2 Car burns fossil fuel
Disrupting the Cycle : Disrupting the Cycle Humans disrupt the cycle by:
1)Deforestation
2)Burning of fossil fuel
Deforestation ? No trees/plants ? No photosynthesis ? Nothing to take in carbon dioxide from our atmosphere ? Increase in amount of carbon in atmosphere
More burning of fossil fuel ? More carbon dioxide produced Both ways will increase carbon dioxide in the atmosphere
What are the consequences of increasing levels of Carbon dioxide in our atmosphere? : What are the consequences of increasing levels of Carbon dioxide in our atmosphere? Greenhouse effect : Heat trapped close to Earth’s surface. Therefore, GLOBAL WARMING! HOT! HOT! HOT!
Acidity in water: alters life cycles of marine life. NO FISH TO EAT !
Homework due Sunday, Dec. 27th : Homework due Sunday, Dec. 27th Read Chapter 5 lesson 1 on B6 to B10
Study guide A sheet pages 24/25
PWB page 13