Question

Bicarbonate indicator (sodium hydrogen carbonate) is a red
coloured solution which is used to check the rise and fall of carbon
dioxide with respiration and photosynthesis respectively. The indicator:
remains red if there is no change in level of carbon dioxide
turns yellow if there is a rise in level of carbon dioxide
turns purple if there is a fall in level of carbon dioxide
Now observe the setup of test tubes A, B, C and D. Draw your conclusions for each case



Pls tell no spam answers
The one who will give correct and first will receive as follows
Brainliest + thanks + follow

Answer 1

Answer:

hydrogencarbonate indicator (hydrogencarbonate indicator) is a type of pH indicator that is sensitive enough to show a color change as the concentration of carbon dioxide gas in an aqueous solution increases. The indicator is used in photosynthesis and respiration experiments to find out whether carbon dioxide is being liberated.[1] It is also used to test the carbon dioxide content during gaseous exchange of organisms. When the carbon dioxide content is higher than 0.04%, the initial red colour changes to yellow as the pH becomes more acidic. If the carbon dioxide content is lower than 0.04%, it changes from red to magenta and, in relatively very low carbon dioxide concentrations, to purple.Carbon dioxide, even in the concentrations found in exhaled air, will dissolve in the indicator to form carbonic acid, a weak acid, which will lower the pH and give the characteristic colour change.[1] A colour change to purple during photosynthesis shows a reduction in the percentage of carbon dioxide and is sometimes inferred as production of oxygen, but there is not actually any direct evidence for it.

Explanation:

hope this is the correct answer

and tq Di for making me brainlist