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.