Starter quiz
- Where does anaeroboc respiration take place?
- mitochondria
- ribosomes
- cytoplasm ✓
- chloroplasts
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- Respiration occurs continuously in the cells of every living organism. The energy transferred is needed for life processes. Which life process does not need energy transferred from respiration?
- active transport
- building proteins from amino acids
- muscle contraction
- photosynthesis ✓
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- Whhat are the reactants in aerobic cellular respiration?
- carbon dioxide and oxygen
- carbon dioxide and glucose
- oxygen and glucose ✓
- oxygen and water
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- What is the product of anaerobic cellular respiration in animal cells?
- carbon dioxide
- ethanol
- glucose
- oxygen
- lactic acid ✓
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- Which two words complete this sentence? Anaerobic cellular respiration is a __________ process, so is a __________ way to transfer energy.
- longer
- shorter ✓
- faster ✓
- slower
-
- We make use of fermentation in yeast to make some foods and drinks. Which product of fermentation causes bread to rise?
- carbon dioxide ✓
- ethanol
- glucose
- lactic acid
- oxygen
-
Exit quiz
Look at the unbalanced equation for aerobic respiration. Which number in front of the CO and HO would balance the equation?- 2
- 4
- 6 ✓
- 8
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- The rate of cellular respiration is affected by temperature. Which is the best explanation for this?
- Chemical reactions are all affected by temperature.
- Organisms can die if they get too cold or too hot.
- Cellular respiration is exothermic.
- Cellular respiration is catalysed by enzymes. ✓
-
The diagram shows part of the apparatus used in the investigation. What is the function of the soda lime?- to absorb carbon dioxide from cellular respiration ✓
- to absorb oxygen from cellular respiration
- to provide oxygen for cellular respiration
- to provide carbon dioxide for cellular respiration
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The water bath in the apparatus is needed to keep the temperature constant because respiration is an exothermic reaction. Which statement about exothermic reactions is correct?- An exothermic reaction transfers heat to the environment. ✓
- An exothermic reaction absorbs heat from the environment.
- To start the reaction, heat is needed.
- To start the reaction, it needs to be cooled.
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- The apparatus shown can be used to measure the effect of temperature on the rate of respiration. The steps of the method to use this apparatus are in the wrong order.
- 1⇔Wait for the organisms to adjust to the temperature.
- 2⇔Mark the starting positions of the coloured liquid in the capillary tubes.
- 3⇔After 5 minutes measure the distance moved by the liquid in each capillary tube.
- 4⇔Repeat at a different temperature.
- Match the words to their correct meaning.
- aerobic cellular respiration⇔respiration that requires oxygen ✓
- anaerobic cellular respiration⇔respiration that does not require oxygen ✓
- cellular respiration⇔chemical process that transfers energy from glucose for life processes ✓
- dependent variable⇔the variable being tested or measured during an experiment ✓
- independent variable⇔the variable that is altered during an experiment ✓
- respirometer⇔apparatus used to measure the rate of respiration ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Effect of temperature on aerobic cellular respiration investigated in small living organisms (e.g. germinating peas).
- The oxygen used by the respiring organisms in a set time can be measured using a simple respirometer.
- Identifying independent and dependent variables, and variables to control to increase the validity of the results.
- The height of coloured liquid in the capillary tube of the respirometer is measured at the start & end of the set time.
- Collecting repeat measurements at each temperature, and collecting data at different temperatures.
Common misconception
That small organisms and plants don't respire (only humans and other large animals).
This lesson demonstrates experimentally that small organisms respire.
Keywords
Aerobic - A process that requires oxygen.
Cellular respiration - An exothermic chemical process that transfers energy for life processes, using glucose as fuel.
Respirometer - Apparatus used to measure the rate of respiration in small organisms.
Independent variable - The factor that we change in an experiment.
Dependent variable - The factor that we measure in an experiment.
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