6 (a) (i) What is the name of the part labelled R in Figure 12? A cell wall B cytoplasm C stomata D waxy cuticle (ii) Figure 13 shows the mass of glucose produced in each layer of a leaf per hour - Edexcel - GCSE Biology - Question 6 - 2018 - Paper 1

In Figure 13, the palisade mesophyll produces a significantly higher mass of glucose compared to the spongy mesophyll. The palisade mesophyll, which is located just beneath the upper epidermis, is more densely packed with chloroplasts and is more exposed to light, thus enhancing its ability to perform photosynthesis more effectively.

Between 9 am and midday, the light intensity increases, which boosts the rate of photosynthesis. During this process, oxygen is produced as a byproduct. As photosynthesis outpaces respiratory consumption, the excess oxygen diffuses out of the leaf through the stomata.

Glucose is a carbohydrate (D).

A common test for glucose is the Benedict's test. To perform this test, add Benedict's reagent to a sample and heat it in a water bath. A color change from blue to green, yellow, or red indicates the presence of reducing sugars like glucose.

The enzyme that will only break down the chain of glucose molecules is called 'amylase'.