Question

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. The diagram shows the appearance of the Petri dish.

Answer 1

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Answer 2

Answer:

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