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Figure 12 shows a cross section through a leaf - Edexcel - GCSE Biology - Question 6 - 2018 - Paper 1
Question 6
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 cuticle (ii) Fi... show full transcript
Worked Solution & Example Answer:Figure 12 shows a cross section through a leaf - Edexcel - GCSE Biology - Question 6 - 2018 - Paper 1
Step 1
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.
Answer
The palisade mesophyll produces significantly more glucose per hour compared to the spongy mesophyll. This is due to its higher density of chloroplasts, which are responsible for photosynthesis, making it more efficient in capturing light energy.
Step 3
Use information in Figure 14 to explain why oxygen moved out of the leaf between 9 am and midday.
Answer
Oxygen moved out of the leaf between 9 am and midday because photosynthesis was taking place at a higher rate due to increased light intensity. During this time, the amount of oxygen produced by photosynthesis exceeded the amount consumed by respiration, causing a net loss of oxygen from the leaf.
Step 4
Step 5
Describe a test for glucose.
Answer
To test for glucose, you can use Benedict's test. Add Benedict’s solution to the sample and heat it in a water bath. If glucose is present, the solution will change color from blue to green, yellow, or brick-red, depending on the concentration of glucose.
Step 6