Draw a labelled diagram of the apparatus you will use to show that heat is produced during respiration in seeds. Why are two flasks used in the experiment?
Answers
Answer:
Heat is produced during the process of cellular respiration. Seeds burn up the sugars stored in them to produce water, carbon (iv) oxide and heat. In this manner the seeds are able to convert the complex sugars into energy molecules (ATP molecules) using it to germinate and grow.
The complete formula for the cellular respiration is as follows:
Glucose + Oxygen = Carbon dioxide + Water + Energy.
Chemical equation:
C₆H₁₂O₆ + 6O₂ = 6CO₂ + 6H₂O +2900 kJ/mole.
You will need the following items to demonstrate that heat is produced during cellular respiration in germinating seeds:
i) 2 vacuum flasks
ii) Fresh bean seeds
iii) Boiled bean seeds
iv) 2 narrow range thermometers
NB: 2 Flasks are used in the experiment because 1 is used as the control and the other is used as the actual experiment.
Steps of the experiments:
1) Put the boiled seeds in one of the flask and the fresh bean seeds in the other flask.
2) Fix a thermometer in each of the flask and secure in place with cotton wool soaked in water.
3) Leave the two flasks in a well lit room and check the temperature readings regularly.
⇒ You will realize that thermometer reading on the fresh been seeds show higher readings than that of the boiled seeds.
⇒This is because the fresh bean seeds undergo respiration and produce heat energy in the form of ATP according to the respiration formula given above.
⇒The boiled seeds, on the other hand, do not show an increase in temperature reading because the seeds once boiled die. Dead seeds are unable to respire and thus do not produce heat.
⇒The flask containing the boiled seeds is used as the control of the experiment to show that indeed it is the process of respiration that produces heat.
⇒ The arrangement of apparatus can be found in the attached diagram.
Note:
- The flasks are put upside down to allow carbon (iv) oxide which is produced during the process of respiration to escape through the cotton as it is denser than the air inside the flask.
- The flasks are filled half way with seeds to allow air in the flask to support respiration.
- Narrow range thermometers are used because of the sensitivity in recording even minute temperature changes.
digram:-
Answer:
Heat is produced during the process of cellular respiration. Seeds burn up the sugars stored in them to produce water, carbon (iv) oxide and heat. In this manner the seeds are able to convert the complex sugars into energy molecules (ATP molecules) using it to germinate and grow.
The complete formula for the cellular respiration is as follows:
Glucose + Oxygen = Carbon dioxide + Water + Energy.
Chemical equation:
C₆H₁₂O₆ + 6O₂ = 6CO₂ + 6H₂O +2900 kJ/mole.
You will need the following items to demonstrate that heat is produced during cellular respiration in germinating seeds:
i) 2 vacuum flasks
ii) Fresh bean seeds
iii) Boiled bean seeds
iv) 2 narrow range thermometers
NB: 2 Flasks are used in the experiment because 1 is used as the control and the other is used as the actual experiment.
Steps of the experiments:
1) Put the boiled seeds in one of the flask and the fresh bean seeds in the other flask.
2) Fix a thermometer in each of the flask and secure in place with cotton wool soaked in water.
3) Leave the two flasks in a well lit room and check the temperature readings regularly.
⇒ You will realize that thermometer reading on the fresh been seeds show higher readings than that of the boiled seeds.
⇒This is because the fresh bean seeds undergo respiration and produce heat energy in the form of ATP according to the respiration formula given above.
⇒The boiled seeds, on the other hand, do not show an increase in temperature reading because the seeds once boiled die. Dead seeds are unable to respire and thus do not produce heat.
⇒The flask containing the boiled seeds is used as the control of the experiment to show that indeed it is the process of respiration that produces heat.
⇒ The arrangement of apparatus can be found in the attached diagram.
Note:
- The flasks are put upside down to allow carbon (iv) oxide which is produced during the process of respiration to escape through the cotton as it is denser than the air inside the flask.
- The flasks are filled half way with seeds to allow air in the flask to support respiration.
- Narrow range thermometers are used because of the sensitivity in recording even minute temperature changes.
diagram:-
Explanation:
