The figure given below represents an experimental set up with a weighing machine to demonstrate a particular process in plants. The experimental set up was placed in bright sunlight. Study the diagram and answer the following questions :
(a) Name the process intended for study.
(b) Define the above mentioned process.
(c) When the weight of the test tubes A and B is taken before and after the experiment, what change is observed ? Justify.
(d) What is the purpose of keeping the test tube B in the experimental set up ?
Given below is the diagram of an experimental set-up.
What is the error present in this diagram?