Respiration Investigations Flashcards
How is oxygen tested for in respiration experiments?
Oxygen is tested using the glowing splint test. A glowing splint is placed in a tube, and if oxygen is present, the splint will reignite or glow brighter
How is carbon dioxide tested for in respiration experiments?
Carbon dioxide is tested by using clear lime water. If carbon dioxide is present, the lime water turns milky.
How can you test if oxygen is used in cellular respiration?
Place germinating beans in a test tube. After some time, insert a glowing splint into the tube. If the splint does not reignite, oxygen has been used up during respiration.
What conclusion can be made if the glowing splint does not reignite in the test tube with germinating beans?
The oxygen has been used up by the beans during cellular respiration.
How can you show that carbon dioxide is produced during aerobic respiration
Place a small organism (like a snail) in a sealed jar with lime water. The lime water will turn milky if carbon dioxide is produced.
What is the result if the lime water turns milky in the presence of a snail?
The snail has produced carbon dioxide during aerobic respiration.
How can carbon dioxide production be demonstrated during anaerobic respiration?
Yeast is added to a sugar solution and sealed with paraffin to prevent oxygen from entering. If the lime water turns milky, carbon dioxide has been produced during anaerobic respiration.
What role does soda lime play in respiration experiments?
Soda lime absorbs carbon dioxide from the air in the experiment to ensure that any carbon dioxide measured comes from the organism being tested.
Why is paraffin used in anaerobic respiration experiments with yeast
Paraffin forms a layer that prevents oxygen from dissolving into the sugar solution, ensuring anaerobic conditions.
What conditions help yeast grow faster in anaerobic respiration experiments?
Yeast grows faster in warm conditions, so the experiment is typically conducted in a warm water bath.
