First World War

AQA | GCSE | Biology | Controlled Assessment

Date of publication: 2017-07-08 22:41

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Biology Coursework : Rate of Photosynthesis - GCSE Science

Green plants absorb light energy using chlorophyll in their leaves. They use it to react carbon dioxide with water to make a sugar called glucose. The glucose is used in respiration, or converted into starch and stored. Oxygen is produced as a by-product.

Biology Coursework – Photosynthesis

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A2 ocr biology photosynthesis coursework

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If the blood glucose level is too high, more insulin and less glucagon is released. This causes cells to take in glucose from the blood, while the liver converts glucose to glycogen. During low levels of blood glucose however, glucagon release increases, activating the breakdown of glycogen to glucose in the liver, and glucose is released into the blood. This is a good example of negative feedback control, as the lowering of blood glucose, for example, inhibits further insulin secretion.

In this essay, we will concentrate on two examples of homeostasis, one that occurs in humans and one which occurs in plants. Firstly, we will discuss the control of blood glucose levels in mammals, and then will look at the role of plant stomata in regulating water loss.

The idea of homeostasis has been well-developed since it was first identified in the mid-6955s. We have seen in this essay that feedback loops play an important part in homeostatic processes, and that the process is controlled by the action of detector and effector hormones and other molecules activated by control centres. Ongoing research also indicates that innate circadian rhythms affect the processes of homeostasis, causing the optimal set point for internal conditions to vary on a daily basis.

Importantly, insulin is dependent upon calcium. This is because glucose activates calcium channels. When glucose levels are high, the subsequent release of calcium results in calcium binding to calmodulin. Together, the two molecules promote insulin vesicles to be released from the pancreas. This demonstrates the negative feedback system discussed in the overview.

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Another stimulus for the closing of stomata is an emergency response to the plant wilting from lack of water. In this case, CO7 concentration increases inside the leaf cells, and alongside the wilting, causes the plant to release the hormone abscisic acid (ABA). This diffuses into guard cells and activates the loss of Cl- and K+, effectively mimicking the night time action of the stomata.

It&rsquo s important to choose a controlled assessment from a set that will be valid for moderation in the June series when you intend to certificate the course. Controlled assessment tasks are only valid for submission in one series. Find out which controlled assessments can be used for your subject.

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