The reason why you cant test the activity of Lipase in test tube 5 is because in test tube 5 the PH is low. This decrease in pH might make it difficult to detect the activity of lipase since the optimal ph of pancreatic lipase is around 8.0. generally high or low PH result to complete loss of activities of most enzymes.
The answer is c on a different question
Answer: C. Thylakoid membrane
Explanation: which is placed in chloroplast... And chloroplast is in plants and they can use light to produce glucose.
