JAMB - Biology (1979 - No. 23)
Alkaline pyrogallol was used in an experiment. That experiment must have been connected with
Excretion
Germination
Transpiration
Digestion
Photosynthesis
Forklaring
Alkaline pyrogallol absorbs water and oxygen. So it is used in photosynthesis to test for the importance of water as one of the materials necessary for photosynthesis to take place.