A student is given a Petri dish containing starch mixed with agar jelly (jelly like medium).
The student makes five wells each of diameter 10 mm in the agar. She fills the wells with solutions of amylase, each with a different pH.
After 24 hours, she pours iodine solution on to the agar jelly.
The iodine solution turns the starch in the agar jelly a dark blue colour.
a. Based on the information given, explain a testable hypothesis using scientific reasoning
b. Identify the independent variable in this investigation. Outline how will you change the variable?
c. Identify two variables that the student controls in his investigation.
d. Suggest one safety precaution for this investigation.
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