B7 Ecology - Decay & RPA10

Quiz
•
Biology
•
9th - 10th Grade
•
Hard
Leah Fowler-Roberts
Used 1+ times
FREE Resource
9 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Students investigated the effect of temperature on the decay of milk. The decay was caused by bacteria in the milk. Figure 1 shows the apparatus used.
This is the method used.
1. Set up the apparatus as shown in Figure 1 with the milk at 20 °C.
2. Record the pH each day for 7 days.3. Repeat with more samples of milk at 5 °C and at 30 °C. What was the dependent variable in the investigation?
The pH of the milk
The type of milk
The volume of the milk
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Students investigated the effect of temperature on the decay of milk. The decay was caused by bacteria in the milk. Figure 1 shows the apparatus used.
This is the method used.
1. Set up the apparatus as shown in Figure 1 with the milk at 20 °C.
2. Record the pH each day for 7 days.3. Repeat with more samples of milk at 5 °C and at 30 °C. How could the students keep the milk at 30 °C for 7 days?
Put a lid on the beaker.
Put the beaker in a water bath.
Stir the milk continuously.
Wrap cloth around the beaker.
3.
FILL IN THE BLANK QUESTION
1 min • 1 pt
Students investigated the effect of temperature on the decay of milk. The decay was caused by bacteria in the milk. Figure 1 shows the apparatus used.
This is the method used.
1. Set up the apparatus as shown in Figure 1 with the milk at 20 °C.
2. Record the pH each day for 7 days.3. Repeat with more samples of milk at 5 °C and at 30 °C. As the milk decays, the bacteria digest fats in the milk. What type of acid is produced by digestion of fats in the milk?
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why did the pH not fall below pH 4.5 at 20 °C?
All the fat had been digested
The reaction was too fast.
The temperature was too low
5.
MATH RESPONSE QUESTION
2 mins • 1 pt
Calculate the rate of digestion at 30 °C from day 2 to day 3 in pH units / day.
Mathematical Equivalence
ON
6.
MATH RESPONSE QUESTION
2 mins • 1 pt
The rate of digestion at 5°C from day 2 to day 3 is 0.1 pH units/day. How many times faster is the rate of digestion at 30°C than the rate of digestion at 5°C from day 2 to day 3?
Mathematical Equivalence
ON
7.
GRAPHING QUESTION
3 mins • 1 pt
Plot the points for the above data.
8.
FILL IN THE BLANK QUESTION
1 min • 1 pt
Which type of milk stays fresh the longest at 10 °C?
9.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A student said: ‘The temperature milk is stored at affects how likely the milk is to cause food poisoning.’ How can the investigation be developed to find out if the student is correct?
Determine the types of bacteria present in the milk
Record the pH every 12 hours
Use more than three different types of milk
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