Question 8
Five nutrient-agar Petri dishes are labelled 1 Control (not opened), 2 Inside of mouth, 3 Unwashed fingertip, 4 Clean fingertip and 5 A chosen surface. Observe through the closed lids; do not reopen growing cultures. Your teacher handles safe disposal.
Results are reliable if you can be sure that they are correct. Look at the order in which you ranked the Petri dishes in question 5. Outline and explain one way in which you could improve the investigation to make this ranking more reliable.
Results are reliable if you can be sure that they are correct. Look at the order in which you ranked the Petri dishes in question 5. Outline and explain one way in which you could improve the investigation to make this ranking more reliable.
