38. State the amount of digestion (in mathrm(mm) ) that might be expected after 48 hours in a test tube that is identical to the other 5 test tubes, but at a temperature of 15^circ mathrm(C) . (1) less than 2.5 mathrm(~mm) (2) between 2.5 and 4 mathrm(~mm) (3) between 4.0 and 7.5 mathrm(~mm) (4) more than 7.5 mathrm(~mm) 39. The best graph of the results of this investigation would be made by plotting the data on which set of axes? (1) (2) (3) (4) 40. The student repeated this same experiment using a glass tube containing potato instead of egg white. After 48 hours, he found no evidence of any digestion. Explain why no digestion occurred. [1] 41. During the winter, many fish eat very little. Some students thought this might be because less oxygen is dissolved in the cold winter wat than in the same water during the warm sum mer months. The students tested the water a found that cold water holds more dissolved oxygen than warm water. They also discover that the fish have nearly as much food avail during the winter as in the summer. Explain why the fish eat very little during winter. [1]

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38. State the amount of digestion (in mathrm(mm) ) that might be expected after 48 hours in a test tube that is identical to the other 5 test tubes, but at a temperature of 15^circ mathrm(C) . (1) less than 2.5 mathrm(~mm) (2) between 2.5 and 4 mathrm(~mm) (3) between 4.0 and 7.5 mathrm(~mm) (4) more than 7.5 mathrm(~mm) 39. The best graph of the results of this investigation would be made by plotting the data on which set of axes? (1) (2) (3) (4) 40. The student repeated this same experiment using a glass tube containing potato instead of egg white. After 48 hours, he found no evidence of any digestion. Explain why no digestion occurred. [1] 41. During the winter, many fish eat very little. Some students thought this might be because less oxygen is dissolved in the cold winter wat than in the same water during the warm sum mer months. The students tested the water a found that cold water holds more dissolved oxygen than warm water. They also discover that the fish have nearly as much food avail during the winter as in the summer. Explain why the fish eat very little during winter. [1]

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38. To answer this question, we need to consider the effect of temperature on the rate of digestion. Typically, enzymatic reactions, including digestion, occur more slowly at lower temperatures. Since the temperature in the question is given as \(15^{\circ} \mathrm{C}\), which is lower than the optimal temperature for most digestive enzymes, we can expect the amount of digestion to be less than what would be observed at higher temperatures.Without specific data from the other test tubes, we can only make a general prediction based on the principle that lower temperatures result in slower reaction rates. Therefore, we would expect the amount of digestion after 48 hours at \(15^{\circ} \mathrm{C}\) to be less than what would be observed at the optimal temperature for the enzyme involved in the digestion process.Given the options provided:(1) less than \(2.5 \mathrm{~mm}\)(2) between 2.5 and \(4 \mathrm{~mm}\)(3) between 4.0 and \(7.5 \mathrm{~mm}\)(4) more than \(7.5 \mathrm{~mm}\)The most likely answer would be:(1) less than \(2.5 \mathrm{~mm}\)This is because the temperature of \(15^{\circ} \mathrm{C}\) is relatively low and would significantly slow down the enzymatic reaction of digestion.Answer: (1) less than \(2.5 \mathrm{~mm}\)39. To create the best graph of the results of this investigation, we would need to plot variables that show the relationship between the rate of digestion and another factor, such as temperature or time. Since the question does not provide specific variables, a common approach would be to plot the amount of digestion (in \(\mathrm{mm}\)) on the y-axis and the temperature (in \(^{\circ} \mathrm{C}\)) on the x-axis. This would allow us to see how the rate of digestion changes with temperature.Answer: The best graph would plot the amount of digestion on the y-axis and temperature on the x-axis.40. If no digestion occurred in the glass tube containing potato after 48 hours, it could be due to the absence of the appropriate enzyme that is capable of breaking down the substances in the potato. Potatoes are rich in starch, and the enzyme required for starch digestion is amylase. If the solution in the tube did not contain amylase or if the conditions were not suitable for amylase activity (such as incorrect pH or temperature), then no digestion would be observed.Answer: No digestion occurred because the appropriate enzyme for digesting potato starch (amylase) was not present or the conditions were not suitable for its activity.41. Fish may eat very little during the winter despite the availability of food and higher levels of dissolved oxygen in cold water because their metabolism slows down in colder temperatures. A slower metabolism means that fish require less energy and therefore need less food. This is a common survival strategy for many animals during colder months when it is more challenging to maintain body temperature and energy levels.Answer: Fish eat very little during winter because their metabolism slows down due to the cold temperatures, reducing their energy requirements.

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