Kakakaty
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I really need help with biology question it's down below the question if anyone can guide me towards the answer i'd really appreciate it, i thought it wrote notes on this topic but i completely forgott

Test Tube A has a leaf and hydrogencarbonate to test CO2 levels – the hydrogencarbonate turns purple
Test Tube B has a leaf and hydrogencarbonate to test CO2 levels – the hydrogencarbonate turns red
Test Tube C has a leaf and to test CO2 levels – the hydrogencarbonate turns yellow

In tube A, did photosynthesis, respiration or both occur?
In tube B, did photosynthesis, respiration or both occur?
In tube C, did photosynthesis, respiration or both occur?
Explain your answers
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Sumi Shanks
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(Original post by Kakakaty)
I really need help with biology question it's down below the question if anyone can guide me towards the answer i'd really appreciate it, i thought it wrote notes on this topic but i completely forgott

Test Tube A has a leaf and hydrogencarbonate to test CO2 levels – the hydrogencarbonate turns purple
Test Tube B has a leaf and hydrogencarbonate to test CO2 levels – the hydrogencarbonate turns red
Test Tube C has a leaf and to test CO2 levels – the hydrogencarbonate turns yellow

In tube A, did photosynthesis, respiration or both occur?
In tube B, did photosynthesis, respiration or both occur?
In tube C, did photosynthesis, respiration or both occur?
Explain your answers
Tube A: Photosynthesis occurred as the hydrogen carbonate turns from redd to purple when there is lack of CO2 which is used for photosynthesis.
Tube B: Both occurs and is in equilibrium so the rate of removal of CO2= rate of production of co2. Photosynthesis=respiration
Tube C: Respiration. Red to yellow indicates an excess of CO2 which is an acidic gas so turns yellow

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