Photosynthesis Flashcards
What is the chemical formula for photosynthesis
6CO2 + 6H2O + sunlight = C6H12O6 + 6O2
Why is photosynthesis important?
It starts all food chains/webs
Makes oxygen
Makes food for a plant
How do we know that plants make carbohydrates from just carbon dioxide, water, and light energy? Give an example
Experiments
Ex: Jan baptista planted a willow branch weighing 5 pounds in 200 pounds and 4 years later it weighed 169 pounds and the soul was still 200 pounds. The additional mass came from the air.
What is the function of the stomata? Why are they on the underside of the leaves?
To allow gas exchange, it is shaded so water will not be released
What type of light can we see?
Visible light
What determines the color of light?
The wavelength
What is the green pigment molecule
Chlorophyll
Why do leaves change colors in the fall?
They want to produce more chlorophyll in the summer, but it stops making that much in the fall due to the lack of light and you stop being able to see chlorophyll
Where do light reactions occur?
Thylakoids
What are the reactants of the light reactions?
Water, light, ADP, Pi, NADP+
What are the products of the light reactions?
ATP, NADPH, OXYGEN
What’s the purpose of the light reaction products?
ATP- energy
NADPH - electrons
Where does the Calvin cycle occur?
Stroma
What are the reactants of the Calvin Cycle?
ATP, NADPH, CARBON DIOXIDE
What are the products of the Calvin cycle?
Glucose, ADP, Pi, NADP+
What is the purpose of the Calvin cycle products?
Glucose- food for the plant
ADP, Pi, NADP+- used to carry out light reactions
Explain the relations ship of photosynthesis and light intensity?
As light intensity increases photosynthesis increases u too it has reached its maximum
Explain the relationship between carbon dioxide and photosynthesis
As carbon dioxide increases photosynthesis increases until it has reached a maximum
Explain the relationship between temperature and photosynthesis
Low temp- decrease of photosynthesis
High temp - increase in photosynthesis
Too hot - decrease in photosynthesis
Why does the rate of photosynthesis decrease and ultimately stop when temperature increases?
The plant begins losing a needed substance, water. The molecules are also becoming denatured.
How many phosphate groups are in one molecule of ATP
3
How many phosphate groups are in one molecule of ADP
2
What are the three parts of an ATP molecule?
Adenine, sugar, and 3 phosphate groups
What happens when ADP gains phosphate?
ATP is made and energy is stored
What happens when ATP splits into ADP and phosphate?
Energy is released
