Plants in Action.

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Presentation transcript:

Plants in Action

PHOTOSYNTHESIS Autotrophic Process: Plants and plant-like organisms make their energy (glucose) from sunlight. Stored as carbohydrate in their bodies. 6CO2 + 6H2O + sunlight  C6H12O6 + 6O2

Photosynthesis-start of ecological food webs!

How do we know that plants make carbohydrates from just carbon dioxide water and light energy? Experiments! For example: Jan Baptisa van Helmont (1648) planted a willow branch weighing 5 pounds into 200 pounds of soil and then after 4 years the tree weighed 169 lbs. and the soil was still nearly 200 lbs.

Photosynthesis 6CO2 + 6H2O + energy  C6H12O6 + 6O2 Carbon dioxide + water Enzymes glucose + oxygen sunlight absorbed by chlorophyll 6CO2 + 6H2O + energy  C6H12O6 + 6O2 As can be seen from the equation for photosynthesis, the wood, bark, and root came from water and carbon dioxide.

Plant leaves have many types of cells!

Plant Cell  Chloroplast  Stroma  Thylakoid  Chlorophyll

Light is a beam of photons [or a wave] than can cause electrons to move

Chlorophyll is at the “heart” of photosynthesis

How interesting!!!

Visible light is only a small part of the electromagnetic spectrum (all forms of light).

The wavelength of light determines its color.

Stage 1 produces ATP , NADPH, and O2

Stage 2 (light independent reactions)

Light-independent reaction Calvin Cycle (aka Dark Reaction) Does not require light Occurs in stroma of chloroplast Requires CO2 Uses ATP and NADPH as fuel to run Makes glucose sugar from CO2 and Hydrogen

Oxygen and Sugar!

Lets tests our comprehension

EQUATION FOR PHOTOSYNTHESIS WATER OXYGEN 6CO2 + 6H2O + ENERGY C6H12O6 + 6O2 CARBON DIOXIDE GLUCOSE

PHOTOSYNTHESIS What affects photosynthesis? Light intensity: as light increases, rate of photosynthesis increases. Why does it level off?

PHOTOSYNTHESIS What else affects photosynthesis? Carbon Dioxide: As CO2 increases, rate of photosynthesis increases. Why does it level off?

What affects photosynthesis? Temperature: Temperature Low = Rate of photosynthesis low Temperature Increases = Rate of photosynthesis increases If temperature too hot, rate drops

Check it! What are some difference between the light and dark reactions?