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PHOTOSYNTHESIS AND CELLULAR RESPIRATION. We will examine the exchange of oxygen and carbon dioxide between living things and the environment. Key Elements. Chloroplasts - Organelles found only in plant cells that carry out photosynthesis . - PowerPoint PPT Presentation
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PHOTOSYNTHESIS AND CELLULAR RESPIRATIONPHOTOSYNTHESIS AND CELLULAR RESPIRATION
We will examine the exchange of oxygen and carbon dioxide between living things and the environment.
Key ElementsKey Elements
Chloroplasts - Organelles found only in plant cells that carry out photosynthesis.
Mitochondria - Organelles found in plant and animal cells that carry out cellular respiration.
What is Photosynthesis?The process by
which chloroplasts capture sunlight energy and make food for a plant.
The sun is the source of energy for photosynthesis.
Why is Photosynthesis Important?
It is important because it is the only thing that produces oxygen
absorbs CO2
Structural Components:1. Chlorophyll only found in chloroplasts
(leaves) absorb sunlight
2. Stomata tiny pores (holes) under the
leaves of plants where CO2 enters and oxygen
exits
3. Roots: absorbs water
EQUATIONEQUATION FORFOR PHOTOSYNTHESISPHOTOSYNTHESIS
6CO6CO22 + + 6H6H22OO + +ENERGYENERGY produces CC66HH1212OO66 + + 6O6O22
CARBON CARBON DIOXIDEDIOXIDE
WATERWATER
GLUCOSEGLUCOSE
OXYGENOXYGEN
Reactants Products
Photosynthesis Process1: Chlorophyll in chloroplasts absorbs sunlight
2: From sunlight, green plants combine with CO2 from the air, and water from the roots to make sugar and oxygen.
3: Oxygen exits the plant through stomata into the air
4: Plants use sugar to make starch, fats, proteins (food)
5: Food is spread throughout the plants by the stem
“oxygen is released from plants everyday…while carbon dioxide is taken away”
What is Cellular Respiration? A process by which both
plants AND animals cells turns food molecules into usable energy (ATP)
Breathing in and out is often referred to as “respiration” and it is connected to, though not the same as, cellular respiration. Breathing provides the oxygen needed for cellular respiration to occur.
Plants –vs- Animals
Plants are autotrophs and produce their own glucose to be used in the respiration reaction.
Animal are heterotrophs, meaning that they cannot produce their own food and need to get their glucose from a plant OR a plant eating animal.
The energy molecule formed in both plants and animals is called ATP (adenosine triphosphate)
2 stages of Cellular Respiration
Step 1: Glycolysis In the Cytoplasm, glucose is
broken down into 2 smaller molecules (Pyruvic Acid) and a small amount of energy is release (ATP).
Step 2: In the Mitochondria, these 2
smaller molecules are combined with oxygen to produce carbon dioxide and water and a great deal of energy (ATP) is produced.
EQUATION FOREQUATION FOR RESPIRATIONRESPIRATION
CC66HH1212OO66 + +GLUCOSEGLUCOSE
6O6O22
OXYGENOXYGEN
produces 6CO6CO22 + +
CARBON CARBON DIOXIDEDIOXIDE
6H6H22OO + + ENERGYENERGYWATERWATER ATPATP
Reactants Products
Released into the atmosphere by breathing.
Used by the cells to grow and reproduce.
Used by the cells or released by osmosis and excretion.
Absorbed from the atmosphere by breathing .
Produced in plants by photosynthesis or eaten by animals as food.
HOW IT RELATES!
Overview of photosynthesis Overview of photosynthesis and respirationand respiration
PHOTOSYNTHESISPHOTOSYNTHESIS CELLCELLACTIVITIESACTIVITIES
RESPIRATIONRESPIRATION
SUNSUN
RADIANT RADIANT ENERGYENERGY
GLUCOSEGLUCOSE ATP(ENERGY)ATP(ENERGY)
Photosynthesis and Cellular Respiration
equations are essentially opposites of each
other!
Lesson Summary Photosynthesis and cellular
respiration are related. How? Photosynthesis occurs in the
chloroplast of plant cells. Cellular respiration occurs in
the mitochondria of plant and animal cells.
Whenever you see an arrow in our equations, think “produces”.
Reactants produce products. Remember, what one produces the other one needs. It is a cycle.