2.2 Animal tissues, organs and organ systems

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

Question 26

Part 1: Crackers contain two types of carbohydrate: starch and reducing sugars (such as glucose).

Describe the chemical tests that could be used to show the presence of these two types of carbohydrate in a cracker sample.

Include a risk assessment in your answer.

[6]

Part 2: A student investigated three brands of crackers.

For each brand of cracker, the student:

placed a $g2\text{ g}$ piece of cracker on their tongue
did not chew the cracker
recorded the time taken for the cracker to taste sweet.

Their results are shown below:

Brand of cracker	Time taken for cracker to taste sweet (seconds)
Brand A	28
Brand B	42
Brand C	19

Answer the following questions based on this study:

What was the dependent variable in this investigation?

[1]

Give one control variable that the student used, or should have used, in this investigation.

[1]

Explain why the crackers began to taste sweet during the investigation.

[3]

Suggest one reason why the results of this investigation might not be valid. Do not refer to control variables in your answer.

[1]

2.2 Animal tissues, organs and organ systems

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

Question 26

Part 1: Crackers contain two types of carbohydrate: starch and reducing sugars (such as glucose).

Describe the chemical tests that could be used to show the presence of these two types of carbohydrate in a cracker sample.

Include a risk assessment in your answer.

[6]

Part 2: A student investigated three brands of crackers.

For each brand of cracker, the student:

placed a $g2\text{ g}$ piece of cracker on their tongue
did not chew the cracker
recorded the time taken for the cracker to taste sweet.

Their results are shown below:

Brand of cracker	Time taken for cracker to taste sweet (seconds)
Brand A	28
Brand B	42
Brand C	19

Answer the following questions based on this study:

What was the dependent variable in this investigation?

[1]

Give one control variable that the student used, or should have used, in this investigation.

[1]

Explain why the crackers began to taste sweet during the investigation.

[3]

Suggest one reason why the results of this investigation might not be valid. Do not refer to control variables in your answer.

[1]

2.2 Animal tissues, organs and organ systems

Question 26

Markscheme

2.2 Animal tissues, organs and organ systems

Question 26

Markscheme

2.2 Animal tissues, organs and organ systems

Question 26

2.2 Animal tissues, organs and organ systems Questions

2.2 Animal tissues, organs and organ systems

Question 26

2.2 Animal tissues, organs and organ systems Questions