Worksheets and lesson ideas to challenge students aged 11 to 16 to think hard about respiration, anaerobic respiration and fermentation (GCSE and Key Stage 3)
Where to start?
Ask students what would happen to a worm if it was placed inside a sealed jar with plenty of food and water. Try to illicit the idea it would die because it would run out of oxygen. Then probe deeper. Would it come back to life if we gave it oxygen? What is the oxygen used for?
Comparing combustion with respiration
The screaming jelly baby is a great demonstration to use when teaching respiration. You have a fuel, oxygen and a huge amount of energy being transferred. What are the similarities and differences of this reaction compared to cellular respiration?
GCSE activity and worksheet comparing respiration with combustion. Students use a simple Venn diagram to consider the similarities and differences between combustion and respiration. This open-style activity is an excellent platform to challenge students and assess their understanding of this fundamental process. (PDF)
Breathing and respiration are not the same
GCSE activity on respiration and breathing. Do plants get a temperature when they are sick? This activity looks at research that shows infected leaves have higher temperatures than healthy leaves. Students use this research to think about the process of respiration and consider how it differs from breathing. By looking at respiration in plants first, many misconceptions linking breathing to respiration can be avoided. (PDF)
How much energy is in food?
How much energy is transferred when we burn food? Follow this link to a scientific investigation that asks students to determine the amount of energy present in Quavers and rice cakes. The practical can be used to help students make the link between respiration and combustion.
Experiencing anaerobic respiration
Ask students to hold one arm above their head and then open and close the attached hand quickly. Repeat this process until the muscles in the arm start to burn. Ask students what is happening and relate the position of the hand to oxygen availability. You can then introduce the concept of anaerobic respiration and lactic acid.
Anaerobic respiration and fermentation
GCSE worksheet on anaerobic respiration and fermentation. Students work in groups of four to silently review what they already know about anaerobic respiration and fermentation in yeast. They then answer a longer answer question comparing and contrasting these two important cellular processes. (PDF)
Do they really get respiration? Erroneous ideas
GCSE worksheet looking at common student errors about respiration. This activity is a great way to correct erroneous ideas that students may have about photosynthesis and respiration. It is probably best used at the end of a teaching sequence on photosynthesis and respiration to check that students have arrived at the scientific way of thinking! The questions could provide a good stimulus for paired discussion or be used for an individual task. (PDF)
- Why don’t you get wine with an alcohol content of above 15%?
- What evidence suggests that mitochondria were once free-living bacteria?
- Aerobic respiration is exothermic. What are the endothermic reactions that can happen because of respiration?
- What is brown fat and why do new born babies have quite a lot of it?
- Sanders, M. (1993). Erroneous ideas about respiration: The teacher factor. Journal of Research in Science Teaching, 30(8), 919-934.