Standard Grade Biology Aerobic Respiration Investigating Cells Revision Exercise

G Respiration Definition Respiration is the __________ of food to release its ________ breakdownenergy Living cells need energy for : 1._____________ 2._____________ 3.____________________ 4.____________________ 5. __________________________________ 6. ______________________ Cell growth Cell division Synthesis of chemicals Movement ( animals) Maintaining body temperature (animals) Photosynthesis ( plants)

C The energy for these processes (metabolism) comes from ____ where it is stored as ________ _________. ____ and _____ contain ________ as much __________ energy per gram as ________ or _____________ foodchemical energy Fatsoilstwicechemical proteinscarbohydrates G Cells need ________ to release _______ from food during ________respiration. Definition of Respiration Respiration is the __________ of ______ to release its ________ breakdownfoodenergy oxygenenergy aerobic

Word equation for aerobic respiration _________ ( food) + _________ __________ + _________ + _________ __________ glucoseoxygen carbon dioxide water energy Some of the energy from respiration is released as _____. The ______________ released during respiration comes from the _____ that the animal eats or the food that the plant makes in ______________. heat G carbon dioxide food photosynthesis

C Metabolism Definition : Metabolism is the sum total of ____ the _________ _________ taking place inside the _____ or ___________. allchemical reactionscellorganism The reactions in cells need energy e.g. a cell needs energy to _______, ________ and __________ special chemicals such as proteins (e.g. _________). ____________ is the metabolic process which ________ the energy which is _______ for ___________ to take place. growdividesynthesise enzymesRespiration releasesneeded metabolism

Experiments that demonstrate aerobic respiration Experiment 1 The Uptake of Oxygen burning splint gas jar germinating peas damp cotton wool Result The burning splint goes out ____________. Reason This happens because the living peas have used up _______ gas quickly oxygen

Experiment 2 The Release of CO 2 live animal red bicarbonate indicator yellow Reason the animal releases _____________ gas in ____________.carbon dioxiderespiration

Experiment 3 The Release of Energy Result : The temperature _____ showing the release of ____ Reason : This happens because ___________ is the __________ of ______ to release its ________. risesheat respirationbreakdown energyfood thermometer germinating seeds vacuum flask

Experiment 4 The release of water dry gas jar burning food Result : ____________ appears on the side of the gas jar Reason : ______ is produced as a product of ____________ condensation waterrespiration

Experiment 5 The Respirometer

At side B the coloured water moves ___ the tube _________the germinating peas because the peas are using up _________ gas during ___________. This causes a _________ in the air pressure (volume) inside tube allowing the level of the coloured water to rise. respiration up towards oxygen reduction

At side A the level of the coloured liquid does not _______. This is because the peas are _____ and not _________ and therefore do not remove _______ gas from the air. The gas inside tube A does not change ________ or _________. Question: When the apparatus was set up as shown, after a few days the level at side A did start to rise. Explain why this happened and how you would prevent it. Answer: on the next slide The _________ the rate of respiration, the_______ the liquid will move up and along towards the organism. The Respirometer ( continued) greaterquicker change deadrespiring oxygen pressurevolume

The dead peas were being ____________ by microbes such as bacteria and fungi ( decomposers). These organisms used up ________ in their _________ causing the level to rise. To prevent this happening the peas should be soaked in __________ before being added to side A. The disinfectant _____ any microbes. decomposed oxygen respiration disinfectant kills Answer: