Bioenegetics Flashcards
What is photosynthesis?
An endothermic reaction where a light energy is transferred by chloroplasts to produce glucose
What is the word equation for photosynthesis?
Carbon dioxide + water —> glucose +oxygen
What is the symbol equation for photosynthesis?
6 CO2 + 6 H2O→C6H12O6 + 6 O2
Where in a plant does photosynthesis take place?
Inside chloroplasts in plant cells
Do all cells have chloroplasts
No, only the ones that receive light
Which plant cells have the most chloroplasts?
The cells that receive the most light…the palisade mesophyll cells in leaves
What factors affect the rate of photosynthesis?
- Light intensity
-Carbon dioxide concentration
-Temperature
-Amount of chlorophyll
Why does temperature affect photosynthesis?
Photosynthesis is a process that uses enzymes. If the enzymes get warmer photosynthesis happens at a faster rate, but if the enzymes get too hot they will denature and the photosynthesis will stop
What other the organisms photosynthesise?
Algae pondweed and seaweed, as well as some bacteria. If there is a chloroplast, it will absorb light energy and photosynthesise.
What is the inverse square law?
The light energy, reaching a certain point is equal to the inverse square of the direction. To that point, we can tear distance into light intensity by using one/d squared
Why does anyone care about the rate of photosynthesis?
Anyone producing food crops will want to maximise profit. Adding in lighting, carbon dioxide or heat into a greenhouse/glasshouse will give faster growth, but may cost more so may not be worth doing.
What is glucose produced in photosynthesis used for?
Respiration by all living cells.
Also, some is converted into starch, fat/oils Celulose, an amnio acids.
Why do plants store glucose as starch?
Starch is insoluble so doesn’t affect osmosis.
Also it is more compact so it’s easier to store large amounts.
The starch is used by cells as a source of glucose for respiration when it is dark
Why do plants convert some glucose into oils?
Seeds have oils stored in them as the energy supply for the new plants start to grow germinate
Why do plants convert glucose into Celulose?
Cell walls are made of Celulose is a strong and help support the plant. all plant cells have cell walls