6 (a) Figure 12 shows a cross section through a leaf - Edexcel - GCSE Biology - Question 6 - 2018 - Paper 1
Question 6
6 (a) Figure 12 shows a cross section through a leaf.
(i) What is the name of the part labelled R in Figure 12?
A cell wall
B cytoplasm
C stomata
D waxy cuticl... show full transcript
Worked Solution & Example Answer:6 (a) Figure 12 shows a cross section through a leaf - Edexcel - GCSE Biology - Question 6 - 2018 - Paper 1
Step 1
What is the name of the part labelled R in Figure 12?
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Answer
The part labelled R in Figure 12 is the 'stomata', which are openings that allow for gas exchange.
Step 2
Describe the difference in the mass of glucose produced per hour in the palisade mesophyll and the mass of glucose produced in the spongy mesophyll shown in Figure 13.
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Answer
The palisade mesophyll produces significantly more glucose per hour compared to the spongy mesophyll. This difference can be attributed to the palisade layer's proximity to the sunlight and its structure, which contains more chloroplasts, enhancing photosynthesis.
Step 3
Use information in Figure 14 to explain why oxygen moved out of the leaf between 9 am and midday.
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Between 9 am and midday, light intensity increases, leading to heightened rates of photosynthesis. As photosynthesis produces oxygen, there is an increased concentration of oxygen inside the leaf compared to the outside environment, facilitating diffusion out of the leaf.
Step 4
Glucose is a
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Answer
Glucose is a D carbohydrate.
Step 5
Describe a test for glucose.
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A test for glucose can be performed using Benedict's test. When Benedict's reagent is added to a solution containing glucose and then heated, it will change color from blue to green, yellow, or red, depending on the concentration of glucose.
Step 6
State the name of this enzyme.
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Answer
The enzyme is likely 'amylase', which specifically breaks down starch into glucose.
