Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
13 Cards in this Set
- Front
- Back
|
What is the key to cellular process identified with energy production? |
Photosynthesis |
|
|
What is photosynthesis? |
The process in which green plants use the energy of sunlight to convert water & carbon dioxide into high-energy carbohydrates & oxygen |
|
|
Explain Van Helmonts experiment |
He wanted to know if plants grew by taking material out of soil. He determined the mass of the dry soil & a small seedling, plated the seedling in the pot & watered it regularly. After 5 years, the seedling was a small tree & had gained 75kg, but the soils mass was almost unchanged. He concluded that the gain in the mass came from the water cause the water was the only thing he added. |
|
|
What does Van Helmonts experiment account for? |
The "hydrate" or water portion of the carbohydrate produced my photosynthesis. |
|
|
What did Van Helmont not realize in his experiment? |
The air had a major contribution to the mass of the tree |
|
|
In photosynthesis, what is the carbon in carbon dioxide used for? |
Sugars & other carbohydrates |
|
|
Explain Priestley's experiment |
He took a candle & put a jar over it & the flame went out. He then put a sprig of mint in, (which contributed the oxygen the flame needed) & the candle stayed lit for a while. |
|
|
What did Jan Igenhousz do? |
Determined that what Priestly determined was only possible when the plant was exposed to light |
|
|
How do plants capture the energy of sunlight? |
Plants gather the suns energy with light-absorbing molecules called pigments |
|
|
What is the main pigment in plants? |
Chlorophyll |
|
|
What are the two main types of chlorophyll? |
-chlorophyll a -chlorophyll b |
|
|
Any compound that absorbs light also compounds what? |
Energy, because light is a form of energy |
|
|
What happens when chlorophyll absorbs light? |
A lot of the energy is transferred directly to electrons in the chlorophyll molecule, raising the energy levels of these electrons. These high electrons are what make photosynthesis work |
