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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 cuticle (... 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
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 attributed to the palisade mesophyll being located closer to the upper side of the leaf, where it can efficiently absorb sunlight for photosynthesis. In contrast, the spongy mesophyll, while still producing glucose, benefits less from direct light exposure.
Step 3
Use information in Figure 14 to explain why oxygen moved out of the leaf between 9 am and midday.
Answer
Between 9 am and midday, the light intensity increases, which enhances the rate of photosynthesis. During this process, oxygen is produced as a by-product. The excess oxygen causes it to diffuse out of the leaf, especially when its concentration inside the leaf exceeds that in the surrounding environment.
Step 4
Step 5
Describe a test for glucose.
Answer
To test for glucose, the Benedict's test can be used. The sample solution is mixed with an equal volume of Benedict's reagent and then heated in a water bath. A color change from blue to brick red indicates the presence of glucose, due to the reduction of copper (II) ions to copper (I) oxide.
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