Advertisements
Advertisements
Question
Given alongside is an experimental set up to demonstrate a phenomenon in a plant:
(a) What is the aim of this experiment?
(b) Why was the bell jar covered with a black cloth?
(c) What is the function of caustic soda in this experiment?
(d) Give an overall chemical equation of the process mentioned in (a) above.
(e) Mention one precaution that should be taken to ensure more accurate results. What change, if any, would you observe in the lime water in Flask A and B? In each case give a reason for your answer.
Advertisements
Solution
(a) Aim - To show that carbon dioxide is released during respiration.
(b) To prevent photosynthesis
(c) To absorb carbon dioxide from incoming air.
(d) C6H12O6 + 6O2 → 6CO2 + H2O + 673 kcal energy {38 ATP}
(e) The respiratory chamber should be covered with black cloth to prevent photosynthesis.
The lime water in Flask A turns milky as the plant respires and gives out carbon dioxide which turns the lime water milky. The lime water in Flask B remains clear as the incoming air is free from carbon dioxide.
APPEARS IN
RELATED QUESTIONS
Describe one experiment you would perform to demonstrate the following phenomena: The germinating seeds produce heat.
Describe one experiment each of you would perform to demonstrate the following phenomena: The germinating seeds can respire even in a total absence of air.
The following diagram refers to an apparatus which is used to demonstrate a physiological process:
What is the purpose of keeping potassium hydroxide solution in test tubes X and Y?
The following diagram refers to an apparatus which is used to demonstrate a physiological process:
Why has the coloured water risen in tubing 1?
Given below is a set of six experimental set-ups (A-F), kept in this state for about 24 hours.
In how many flasks, the different plant parts have been kept under observation?
Given below is a set of six experimental set-ups (A-F), kept in this state for about 24 hours.
What is the purpose of keeping a test-tube containing limewater in each flask?
In order to study and prove a particular physiological process in plants, the following experiment was set up. Study the same and then answer the question that follows:
Name the physiological process being studied.
The given fig. refers to an apparatus which is used to demonstrate a physiological process:
(a) What is the purpose of keeping potassium hydroxide solution in test tubes X and Y?
(b) What is the purpose of keeping boiled peas soaked in disinfectant in test tube Y?
(c) Why has coloured water risen in tube 1?
(d) Name the biological process which causes the above rise.
(e) Define the biological process shown in the experiment.
Name the following:
The chemicals generally used to absorb carbon dioxide in respiratory experiments.
Name the following:
The solution that turns milky when carbon dioxide is passed through that solution.
