respiration Flashcards
2.34 - 2.39
2.34 how does the process of respiration produce ATP
energy is released from glucose either in the presence of oxygen (aerobic) or no oxygen (anaerobic)
resulting in the production of carbon dioxide and water as waste products
energy is transferred in the form of ATP
2.35 what does ATP provide for cells
ATP provides energy for cells
(muscle contractions & keeping warm - painting a constant temperature)
2.36 differences between aerobic & anaerobic respiration with oxygen
aerobic needs oxygen
anaerobic doesn’t need oxygen
2.36 differences between aerobic & anaerobic respiration with the breakdown of glucose
breakdown is complete in aerobic
breakdown is incomplete in anaerobic
2.36 differences between aerobic & anaerobic respiration with the products
aerobic = carbon dioxide & water
anaerobic =
anima cells: lactic acid
yeast: carbon dioxide & ethanol
2.36 differences between aerobic & anaerobic respiration with the energy released
aerobic releases a lot of energy
anaerobic releases a little
2.37 word equation for aerobic respiration
glucose + oxygen → carbon dioxide + water
2.37 the balanced chemical symbol equation for aerobic respiration
C6H12O6 + 6O2 → 6CO2 + 6H20
2.38 the word equation for anaerobic respiration in animals
glucose —> lactic acid
2.38 the word equation for anaerobic respiration in plants
glucose —> ethanol + carbon dioxide
2.39 practical: evolution of carbon dioxide from respiring seeds
measure out 10 cm3 of hydrogencarbonate indicator into 3 boiling tubes
put in a layer of cotton wool
place 10 germinating seeds in tube A
place 10 boiled/dead seeds in tube B
place 10 glass beads in tubeC
seal each tube with a rubber bung
after 3 hours, observe the colour of the indicator
high CO2 = yellow
atmospheric CO2 = orange
low CO2 = purple
2.39 practical: demonstrating the production of heat from respiring seeds
flask A with the dead seeds
flask B with the germinating seeds
make sure the cotton wool is plugging the top of each flask
hold the thermometer in place with the cotton wool
invert the flask
record the initial temperature
after 4 days, record the final temperature
2.39 practical: analysis
the thermometer in the flask with the germinating seeds (Flask B) should show an increase in temperature
- the seeds in flask B are respiring and producing heat energy in the process
flask A should remain at room temperature
the seeds in flask A are not respiring because they are dead, so the temperature remains the same
this shows that respiration is an exothermic reaction
2.39 practical: CORMS evaluation evolution of carbon dioxide
change - we will change the content of the boiling tube (germinating seeds, dead seeds or glass beads)
organisms - the seeds used should all be of the same age, size and species
repeat - we will repeat the investigation several times to ensure our results are reliable
measurement 1 - we will observe the change in the hydrogen carbonate indicator
measurement 2 - …after 3 hours
same - we will control the volume of hydrogen carbonate indicator, the number of seeds/beads, the temperature of the environment
2.39 practical: CORMS evaluation evolution of heat
change - we will change the content of the flasks (germinating seeds or dead seeds)
organisms - the seeds used should all be of the same age, size and species
repeat - repeat the investigation several times to ensure our results are reliable
measurement 1 - change in the temperature on the thermometer
measurement 2 - …after 4 days
same - control the number of seeds, the starting temperature of the flasks, the material and size of the flasks
