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DO NOW(1)
1. Design an experiment that shows the movement of starch and iodine through a semipermeable membrane
How can we tell where starch is present?
2. Why does a potato lose weight when placed in a saltwater solution?
Photosynthesis
DO NOW(2)
1. Why does water move into cells when cells are placed in distilled water?
2. What is the difference between active transport and passive transport (diffusion)?
DO NOW (3)
1. Plant and animal cells are different. Which organelle belongs to a plant cell, animal cell or both (mitochondria, chloroplast, cell wall, cell membrane).
2. How do organisms obtain/get nutrition?
• Quiz Friday on Photosynthesis
• Test next Wednesday (photosynthesis & Respiration)
How do organisms obtain nutrition?There are 2 ways:1. Heterotrophs• Unable to synthesize own food. • Ingests food (nutrients) produced by, or available in, other
organisms.
2. Autotrophs • Autotrophs make their own food. Also called producers• Plants do not need to ingest food. Sugar (nutrients) synthesized
during photosynthesis (some organisms)
Why do living things need nutrition?
For energy!
Energy is needed for:– Growth– Maintaining homeostasis• All life Functions• GRRRNETS
– Reproduction
Everything
What are some types of autotrophs? Mostly green plants and some single-celled organisms – Trees, grass, bushes, photosynthetic bacteria, algae
How do autotrophs make food?PhotosynthesisPhoto I Synthesis = Light I Creates
Many autotrophs are plants. How are plants different from animals? (Think cellular)
Photosynthesis Equations
Carbon dioxide + water + light glucose+ oxygen
6C02 + 6H2O + Light C6H12O6 + 6O2
Inorganic molecules Organic molecule + O2
Sun’s Energy Stored chemical energy (bonds)
Photosynthesis in a StoryPhotosynthesis takes place in the chloroplasts of green plants. Chloroplasts contain the pigment chlorophyll which traps radiant energy from the sun!The Sun’s energy splits water into Oxygen (waste product) and HydrogenThe hydrogen is then combined with Carbon Dioxide to create glucose Glucose stores the Sun’s energy and Oxygen is used by plants and animals to get the energy from glucose (respiration)
http://www.teachersdomain.org/asset/tdc02_vid_photosynth/
Hmmm…
Is the Sun the Ultimate source of energy in most living organisms?
If photosynthesis did not take place, would we have oxygen to breath?
DO NOW (4)
1. What is needed (reactants) for photosynthesis?
2. What are the products of photosynthesis?
3. Why does photosynthesis take place? Why is it important?
Photosynthesis Photosynthesis - Process where the Sun’s energy is used
to synthesize organic compounds. Sun’s energy is converted into chemical energy stored in the bonds of glucose (organic compound produced).
Is the Sun the Ultimate source of energy in most living organisms?
If photosynthesis did not take place, would we have oxygen to breath? Would we have food to eat?
Where does photosynthesis take place?
In chloroplasts found inside the mesophyll cells of leaves– Does photosynthesis take place in leaf stems or a tree trunk?
Why are chloroplasts important for photosynthesis?
Chloroplasts contain chlorophyll– Chlorophyll
– Why are plants green?
– What colors are absorbed best?
Does the color of light affect photosynthesis?What is your conclusion (Why):
Fri Sat Sun Mon Tues Wed Thurs
Green 0 - - 4 mm 9 mm 17 mm 20 mm
Blue 6 mm - - 43 mm 50 mm 67 mm 67 mm**
Red 2 mm - - 59 mm 64 mm 84 mm 87 mm
Yellow - - - - - - -
Clear 0 - - 37 mm 49 mm 70 mm 75 mm
No light filter - - - - 54 mm 66 mm 75 mm
There are two parts to photosynthesis
How does photosynthesis make glucose?
• Take place in chloroplasts In leaves
• Only occurs in Light
• Sun’s light energy captured by chlorophyll – Light energy is used to split H2O into H2 and O2
• Oxygen is given off as a waste product
1 - Light-dependent reactions:
2 - Light-independent reactions:
• Takes place in chloroplastin leaves
• Can take place with or without light
• CO2 is combined with H2 to create GLUCOSE– Glucose = stores the energy of the Sun in bonds.
This is chemical potential energy
Exit question:• How is glucose synthesized?
Do Now (5)
1. Finish the formula:
______________ + ________ + light __________+ __________
2. Questions:– #2, 6, 24 in packet
What is going on here?The “thing” in the beaker is a green elodea plant. What are those little bubbles in the test tube?
How can we measure the rate of photosynthesis?
Measure the amount of product produced!– How?
What could speed-up or slow-down the rate of photosynthesis?
6C02 + 6H2O + Light C6H12O6 + 6O2
http://www.saddleworth.oldham.sch.uk/science/simulations/waterweed.htm
Conclusions:Light intensity:
Amount of CO2:
Color of light :
How do plants get materials needed for photosynthesis?
Roots
Stems
Leaves
Roots• Many active transport proteins – Mineral ions and nutrients are actively transported into
the roots
• This creates low water concentration in the roots…• So, how does water get into the roots?
Roots• Water diffuses (osmosis) into the roots and is trapped
by a special membrane surrounding the roots. • This creates pressure and the only place to go is up! • Why does the water have to go up to the leaves?
Test yourself…
Write 2 of the 4 equations of photosynthesis without looking. Show reactants and products.