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1. General. The mark scheme for each question shows: the marks available for each part of the question. the total marks available for the question. the typical answer or answers which are expected.
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MARK SCHEME – AS BIOLOGY – 7401/1 – JUNE 2017 3 Mark scheme instructions to examiners 1. General The mark scheme for each question shows: the marks available for each part of the question the typical answer or answers that are expected extra information to help the examiner make his or her judgement and help to delineate
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General marking principles for National 5 Biology This information is provided to help you understand the general principles you must apply when marking candidate responses to questions in this Paper. These principles must be read in conjunction with the detailed marking instructions, which identify the key features required in candidate responses.
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BIOLOGY 2017 ANSWER SHEET - Free download as PDF File (.pdf) or view presentation slides online.
- Indicative content AO1 (6 marks)
- Causes and treatments: Cataracts:
- Long-sightedness:
- Short-sightedness:
- Indicative grade boundaries
- Indicative content AO2 (3 marks)
An explanation making use of the following points and key terms:
Protein build-up causes cloudy lens. Lens replaced surgically with a plastic one.
eyeball too short or insufficient curvature of cornea Image focused behind retina and corrected using converging lens. Lens bends rays before they reach the eye. contact lenses/spectacles laser surgery
eyeball too long or cornea too curved Image focused in front of retina and corrected using diverging lens. Lens spreads out rays before they reach the eye. contact lenses/spectacles laser surgery
Cancer in the brain can be diagnosed using CT scans. Cancer in the brain can be diagnosed using PET scans. Brain tumours can be treated with radiotherapy. Brain tumours can be treated with chemotherapy.
Link the development of the tumour to difficulties in the brain and each technique to its advantages: A tumour could damage brain function/other cells. A tumour could also reduce blood flow to cells in the brain. Damage could lead to reduced brain function in some areas. The brain is difficult to access. This problem with access makes both treatmen...
Oxford Revise AQA GCSE Biology Answers. Here you’ll find all the answers to the activities and exam-style practice questions featured in Oxford Revise: AQA GCSE Biology Higher. Chapter 1: Cell biology. Chapter 2: Cell transport.
Questions and model answers on 2.5 Cell Recognition & the Immune System for the AQA A Level Biology syllabus, written by the Biology experts at Save My Exams.
