Subject :NSO Class : Class 7
Some pieces of French fries are placed each on three petri dishes as shown below. In petri dish (a), water is added and mixed thoroughly with the fries. In petri dish (b), saliva is added and mixed thoroughly with the fries. Nothing is done to the fries in petri dish (c). The dishes are kept in an incubator at 37°C for 12 hours. After that a few drops of iodine are added to each of the petri dishes. In which petri dish will the iodine remain brown?
(A) (b) only
(B) Both (a) & (b)
(C) (c) only
(D) Both (b) & (c)
Ans 1:
Class : Class 7
A