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

Two hours after eating, the blood glucose concentration for the person with diabetes is 350 mg per dm³, while for the person without diabetes, it is 100 mg per dm³. Therefore, the difference is:

$350 - 100 = 250$

Thus, the answer is 250 mg per dm³.

The blood glucose concentration changed the most in the period from 0 – 2 hours, as this is where the steep increase occurs.

The pancreas is the organ that releases insulin to regulate blood glucose concentrations.

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

Phototropism

• Phototropism refers to the plant's growth in response to light. When a plant detects light, auxins are produced in the shoot tip.
• These auxins migrate to the shaded side of the shoot, promoting cell elongation in that area.
• As a result, the shoot bends toward the light, facilitating more efficient photosynthesis.

Gravitropism

• Gravitropism (or geotropism) refers to how plants respond to gravity. Auxins are also involved in this response, directing growth in roots and shoots differently.
• In roots, auxins are concentrated on the lower side, causing those cells to elongate less than the upper side, leading the root to bend downwards toward gravity.
• In shoots, auxins have the opposite effect, promoting growth on the downside, which makes the shoot bend upwards, away from gravity.

This coordinated action enables plants to orient themselves optimally in their environment.