Respiration Flashcards
What solution are the peas soaked in and why?
Milton solution.
For preservation as well as to kill bacteria. This is needed as bacteria would also respire and release heat therefor affecting our results.
Why are the thermos flasks insulated?
So heat isn’t transferred to the surroundings (lost) so we can measure the correct change in temperature.
Why do the peas (alive ones so not boiled) produce heat?
Fom respiring
What else could we measure in the germinating peas experiment, how could we measure this and what would the results look like?
We could use delivery tubes to collect any gas produced to measure any carbon dioxide produced. This gas can then be bubbled through limewater and only the gas from flask A (alive peas) would turn cloudy - this shows that carbon dioxide is produced.
What is aerobic respiration?
Aerobic respiration uses oxygen to break down glucose and release energy. Some energy is released as heat, but most is trapped in a useable form of ATP.
It produces a lot of ATP because it completely oxidises the glucose.
What is the word equation and chemical symbol equation for aerobic respiration?
Glucose + oxygen -> carbon dioxide + water
C6H12O6 + 6O2 -> 6CO2 + 6H2O
What are the differences between aerobic and anaerobic respiration?
Anaerobic respiration is without oxygen.
Anaerobic produces less ATP because glucose is not completely broken down.
Anaerobic produces toxic waste products as a result (must either be broken down or excreted or it will begin to kill cells.
What are 5 examples of uses of energy from respiration?
-Cell division
-Muscle contraction
-Building larger molecules (eg proteins)
-Transporting molecules (eg active transport)
-Maintaining body temperature (birds and mammals)
What is the difference in anaerobic respiration between fungi/plants and animals?
Fungi and plants:
Glucose -> ethanol + carbon dioxide
Animals:
Glucose -> lactic acid
