K.C.S.E Biology Q & A - MODEL 2015PP1QN18
The diagram below shows an experimental set-up to investigate the conditions necessary for germination. Test tube P was placed in a refrigerator while Q was left at room temperature. The set-ups were observed regularly for two weeks but no germination occurred.
Explain the observations in P and Q.
P - the low temperature/freezing temperature inactivated enzymes;
Q - Boiling eliminated oxygen; oil layer prevented entry of oxygen necessary for respiration during growth;
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