Photosynthesis

Autotrophs vs. Heterotrophs Autotrophs “self-feeders” – make own food from inorganic nutrients

Autotrophs vs. Heterotrophs

Heterotrophs “other-feeders” – cannot make food from inorganic nutrients

How Cells Gain Energy From Food

Animal & Plant Cells

The Importance of PhotosynthesisOnly three plants stand between humanity and starvation.

Photosynthesis

Process that transforms simple molecules (CO2) into more complex molecules (carbs) using H2O, minerals & sunlight

Watch Amoeba Sisters Photosynthesis and the Teeny Tiny Pigment Pancakes

Photosynthesis

CO2 and H2O are the end products of what process?

Where did the hydrogens (electrons) in water go?

How is energy being transformed?

What is the fate of glucose?

What do plants need in order to photosynthesize?

Photosynthesis is driven by visible light

What colors are absorbed?

What color is reflected?

Why are plants green?

Chloroplasts – where photosynthesis occurs

Contain pigments that absorb light

Chloroplasts – where photosynthesis occurs

Thylakoids –inner network of membranes

Stroma – liquid material inside chloroplast

What part of a plant contains the most chloroplasts?

Leaves!

LeafStomata – pores on leaf that let CO2 in & oxygen and water vapor out

Where are stomata located? On the top or underside of the leaf? Why?

2 Stages of Photosynthesis

Light Reactions

Where does this step occur in a chloroplast?

INPUTS?

OUTPUTS?

H2O + light energy O2 + NADPH + ATP

Solar energy to chemical energy!

Calvin Cycle

Where does this step occur in a chloroplast?

INPUTS?

OUTPUTS?

Does this step need light?

NADPH + ATP + CO2 glucose

What happens to glucose now?

Cellular resp.

Starch

Cellulose

Fate of Glucose?

Photosynthesis produces our planet’s oxygen as well as 155 billion tons of biomass each year (about 25 tons for every person on earth)!

View this Bioflix animation on Photosynthesis

Variations of Photosynthesis (C3, C4, and CAM) in Different Climates

Plants must open their stomata in order to take in _____________ for photosynthesis.

When plants do this, _____________ escapes.

If a plant lives in a hot, dry environment, it must conserve its water by_______________________.

So how will it take in carbon dioxide?

Variations of Photosynthesis (C3, C4, and CAM) in Different Climates

Visit the website http://wc.pima.edu/~bfiero/tucsonecology/plants/plants_photosynthesis.htm

Using Photosynthesis to Fight Climate Change?

http://instruction2.mtsac.edu/jkido/Biology%201/Lec%20Handouts%20&%20Articles/Exam%202/The%20Ocean's%20Invisible%20Forest.pdf

Watch the video “Capturing Carbon”(After clicking on the “play” button, scroll forward to time stamp 27:53 in order to watch this video)

An 8th-grader's science project prompts her scientist dad to develop a new way to pull excess CO2 out of the atmosphere.

Watch the video “Algae Fuel”

In the search for alternatives to gasoline, are algae the answer?

How is Climate Change Affecting Life?

https://www.arborday.org/media/zones.cfm

Read the online article “Spring Forward”

The Big Picture: Energy flow in living things