mr. cruz photosynthesis 8-1 and 8-2

1 Mr. Cruz

Photosynthesis CIDEB

PHOTOSYNTHESIS

M. C. Alejandro Cruz

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• 1) Where do autotrophs get energy to produce food?

• 2) How do living things use ATP?• 3) How is one molecule of ATP formed from one

molecule of ADP?• 4) How does a change from ATP to ADP provide

an organism with energy?• 5) What are two ways in which cells use the

energy provided by ATP?• 6) What are the similarities between autotrophs

and heterotrophs?• 7) What are the differences between autotrophs

and heterotrophs?

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ENERGY

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Energy and Life

• Energy:

• The ability to do work

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Energy and Life• Autotrophs:

• Organisms able to use light energy from the sun to produce food.

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Energy and Life

• Heterotrophs:

• They obtain energy from the foods they consume.

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Energy and Life

• Chemical energy and ATP

• Forms of energy:• Light• Heat• Electricity• Chemical compounds

What are chemoautotrophs?

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Energy and Life

• ATP• Adenosine

Triphosphate• Adenine• Ribose• Three phosphate

groups

THE BASIC ENERGY SOURCE OF CELLS

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Energy and Life

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Energy and Life

ATP online activity

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• By eating (they get energy from foods they consume)

• By making their own food

• To store energy and release it for cell work

• The sun

Energy and Life

• What is the ultimate source of energy for plants?

• What is the role of ATP in the cell?

• How do autotrophs obtain energy?

• How do heterotrophs obtain energy?

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Energy and Life

The End

Section 8-1

Mr. Cruz

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• 1) What is the role of light in photosynthesis?

• 2) What is the role of chlorophyll in photosynthesis?

REACTANTS PRODUCTS

CO2

Carbohydrates

O2

Sun light

Chlorophyll

Water

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Photosynthesisan overview

• What do you know about photosynthesis?

• Where does the tree´s increase in mass come from?

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• Plants grow because they take materials out of the soil

• Van Helmont´s Experiment:

• 90.9 Kg of dry soil in a pot• 2.3 Kg willow shoot planted• Watered • 5 years weighted• 77 Kg (tree)• 90.8 soil

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• 90.9 Kg of dry soil in a pot• 2.3 Kg willow shoot planted• Watered • 5 years weighted• 77 Kg (tree)• 90.8 soil

How much weight had the plant gained?

How much weight had the soil lost?

How long did the experiment go on for?

What did van Helmont do to the plant during the experiment?

74.7 Kg

0.1 Kg

5 years

Add water

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What was van Helmont´s conclusion?The gain in mass comes from water

The experiment account for the “hydrate”

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• What do we know about plants?

• Plants grow without eating food

• Plants need water

• Joseph Priestley observed that a candle burning in a sealed jar soon went out.

• If a mouse was put into the jar it soon suffocated

Burning uses up oxygen in the airAnimals need to breathe in oxygen

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Priestley: “Something in the air keeps the flame burning

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• What do we know about photosynthesis so far?

• Plants grow without eating

• Plants need water

• Plants give out oxygen

• Animals need the oxygen that plants produce

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• Jan Ingen-Housz

• Discovered that plants only gave out oxygen when they were in light

• Only the green parts of plants give out oxygen

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• Plants make their own _________• Plants need ________• Plants give out ________• Animals need the oxygen that plants ___• Photosynthesis occurs when plants are in ___• During photosynthesis plants take in ____

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• Pigments: light absorbing molecules

• Chlrophyll: absorbs light in the blue-violet and red regions of the visible spectrum

• Green light is reflected by leaves

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• Write a paragraph in your own words that explains how plants produce high-energy sugars through the process of photosynthesis.

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Name What he discovered

van Helmont

Priestley

Ingenhousz

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Energy and Life

The End

Section 8-2

Mr. Cruz

mr. cruz photosynthesis 8-1 and 8-2

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