In an investigation, equal amounts of water was placed in three test tubes labeled G, H and J. pondweeds of equal length were dropped in each test tube. The test tubes were then placed in identical conditions of light and carbon (IV) oxide at different temperatures for five minutes.
After five minutes, the bubbles produced in each were counted for one minute. The results were as shown in the table below.
(i) Name one requirement for this process that is not mentioned in the investigation.
(ii) Name the gas produced in this investigation.
(iii) Account for the results in test tubes H and J.
Answer:
i)-Presence of chlorophyll
ii)Oxygen gas
iii)
H-#35^0C# is optimum for maximum enzyme activity, rate of photosynthesis is at its best or highest hence more oxygen gas is
produced i.e. more bubbles.
J-#55^0C# is temperature beyond #40^0C# which denatures photosynthesis enzymes hence rate of photosynthesis is low, hence less oxygen gas produced i.e. fewer bubbles.
ii)Oxygen gas
iii)
H-#35^0C# is optimum for maximum enzyme activity, rate of photosynthesis is at its best or highest hence more oxygen gas is
produced i.e. more bubbles.
J-#55^0C# is temperature beyond #40^0C# which denatures photosynthesis enzymes hence rate of photosynthesis is low, hence less oxygen gas produced i.e. fewer bubbles.
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Explain what would happen to red blood cells if they are placed in a concentrated salt solution. 
