The graph shows the blood glucose concentrations of two people, over an eight-hour period, after eating a meal - Edexcel - GCSE Biology - Question 5 - 2013 - Paper 1

At two hours after eating, the blood glucose concentration for the person with diabetes is 350 mg per dm³, and for the person without diabetes, it is 100 mg per dm³. The difference can be calculated as:

$ext{Difference} = 350 ext{ mg per dm}^3 - 100 ext{ mg per dm}^3 = 250 ext{ mg per dm}^3$

B 2 – 4 hours

The pancreas.

Growth hormones, particularly auxins, play a crucial role in plant responses to environmental stimuli such as light and gravity.

Phototropism

When a plant is exposed to light, auxins are produced at the shoot tip. These hormones move to the shaded side of the shoot, causing cells there to elongate more than those on the light-exposed side. This uneven growth causes the shoot to bend towards the light source, facilitating more efficient photosynthesis.

Gravitropism

In roots, auxins cause a differential response to gravity. When a root grows, auxins accumulate on the lower side, promoting cell elongation there. Consequently, the root bends downwards, allowing it to anchor firmly and access more water and nutrients from the soil. This adaptive growth is vital for the survival of the plant.