Bioenergetics- Photosynthesis Flashcards
Photosynthesis transfers _____ energy into ________ energy inside plants.
Photosynthesis transfers light energy into chemical energy inside plants.
Photosynthesis is an ____________ reaction.
Photosynthesis is an endothermic reaction.
The reactants in photosynthesis are ______ _______ and _____.
The reactants in photosynthesis are carbon dioxide and water.
The products of photosynthesis are _______ and ______.
The products of photosynthesis are glucose and oxygen.
What is the chemical symbol for Carbon Dioxide?
Carbon dioxide - CO2
What is the chemical symbol for Water?
Water - H2O
What is the chemical symbol for Oxygen?
Oxygen - O2
What is the chemical symbol for Glucose?
Glucose - C6H12O6
Glucose made in photosynthesis is used for: production of c_______ c___ w____, producing a____ a____, producing f___ and o___ and can be stored as i_________ s_____.
Glucose made in photosynthesis is used for: production of cellulose cell walls, producing amino acids, producing fats and oils and can be stored as insoluble starch.
The rate of photosynthesis can be affected by: c_____ d______ concentration, _____ intensity, t__________ and the amount of c_________.
The rate of photosynthesis can be affected by: carbon dioxide concentration, light intensity, temperature and the amount of chlorophyll.
Limiting factors for photo synthesis are important to the _________ of growing in greenhouses.
Limiting factors for photo synthesis are important to the economics of growing in greenhouses.
Limiting factors interact to gain maximum ______ ____ and ______.
Limiting factors interact to gain maximum growth rate and profit.
where does photosynthesis take place
inside the leaves of the plant where the chloroplasts are found
required practical - photosynthesis
- take a boiling tube and place it 10cm away from an LED light source
- fill the boiling tube with sodium hydrogen carbonate solution.
- place a piece of pond weed into the boiling tube and cut the top off
- leave for 5 minutes to allow pond weed to acclimatize
- start a stop watch and count the number of bubbles produced in one minute
- repeat two more times and calculate the mean number of bubbles
- repeat experiment from the start but do it at 20cm, then 30, then 40
why is an LED light source used
it doesn’t change the temperature of the experiment
what are the two main problems with this practical
bubbles can be too fast to count accurately
bubbles are not always the same size meaning a large bubble would be the same as a small
How can you overcome these problems
by measuring the volume of oxygen produced
explain the practical again whilst improving the problems
place the pondweed under a funnel and catch the bubbles in a measuring cylinder filled with water
when producing a graph after this experiment what’s the key point and what is it called
if we double the distance, then the number of bubbles per minutes falls by a factor of 4. This is known as the inverse - square law
what’s the reason for the inverse - square law
If we double the distance, the light intensity falls by four times and because we need light for photosynthesis that also causes the number of oxygen bubbles to fall by four times