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GCE May 2006 : (A2 3A) Synoptic Paper

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Centre Number 71 Candidate Number ADVANCED General Certificate of Education 2006 Biology assessing Module 6A: Synoptic Paper A2B31 Assessment Unit A2 3A [A2B31] TUESDAY 30 MAY, AFTERNOON TIME 1 hour. INSTRUCTIONS TO CANDIDATES Write your Centre Number and Candidate Number in the spaces provided at the top of this page. Write your answers in the spaces provided in this question paper. Answer all four questions. 1 29.6.05BP 2 8.8.05ES 3 24.9.05PEG INFORMATION FOR CANDIDATES The total mark for this paper is 50. Section A carries 35 marks. Section B carries 15 marks. You should spend approximately 20 minutes on Section B. You are expected to answer Section B in continuous prose. Quality of written communication will be assessed in Section B. Figures in brackets printed down the right-hand side of pages indicate the marks awarded to each question or part question. A data sheet is provided for use with this paper. For Examiner s use only Question Number 1 2 3 4 Total Marks A2B3AS6 1636 Marks Section A Examiner Only Marks 1 Remark (a) The diagram below shows the production of nitrate ions from organic matter entering the soil. A B Organic compounds ammonium ions nitrate ions Identify the processes represented by A and B in the diagram. A __________________________ B __________________________ [2] (b) In an experiment on the uptake of nitrate ions in plants, barley roots were placed in a dilute solution containing nitrate ions. Air containing different concentrations of oxygen was bubbled through the solution and the rate of respiration of the barley roots, as well as nitrate ion uptake, was measured. The results are shown in the graph below. 100 Nitrate ion uptake and rate of respiration/arbitrary units nitrate uptake respiration 75 50 25 0 10 20 30 Oxygen concentration/% 40 50 1 29.6.05BP 2 8.8.05ES 3 24.9.05PEG 0 A2B3AS6 1636 2 [Turn over (i) Describe the trends shown in the graph opposite. Examiner Only Marks Remark ______________________________________________________ ______________________________________________________ ______________________________________________________ ______________________________________________________ ___________________________________________________ [3] (ii) Explain, precisely, how oxygen availability influences the rate of respiration. Your explanation should refer to the biochemistry of respiration. ______________________________________________________ ______________________________________________________ ______________________________________________________ ___________________________________________________ [2] (iii) Explain how oxygen availability influences the rate of nitrate ion uptake. ______________________________________________________ ______________________________________________________ ______________________________________________________ ___________________________________________________ [2] 3 24.9.05PEG (c) Give one function, in plants, for each of the following ions. Magnesium _______________________________________________ 2 8.8.05ES _________________________________________________________ Nitrate ___________________________________________________ 1 29.6.05BP _________________________________________________________ Phosphate _________________________________________________ ______________________________________________________ [3] A2B3AS6 1636 3 [Turn over 2 In an experiment on the effect of grazing by rabbits on different species of grasses, an area of pasture was fenced, in springtime, to prevent the entry of rabbits. The fenced area was 20 20 metres in a pasture fifty times that dimension. At the end of the summer, the open pasture (grazed area) and the fenced area (ungrazed area) were sampled using 20 random quadrats in each area. In each quadrat, the grass was cut, sorted into different species and the dry mass of three species recorded. The mean mass of each species and 95% confidence intervals, for each area, is shown in the table below. Dry mass of grass in the grazed area/g m 2 Dry mass of grass in the ungrazed area/g m 2 Grass species Mean 95% confidence intervals Mean 95% confidence intervals Lolium perenne 20.2 4.8 30.9 5.9 Poa annua 15.5 3.5 7.6 3.4 8.3 3.2 5.0 2.8 Phleum pratense (a) A t-test was undertaken to compare the mean dry mass of Lolium perenne in the grazed area with the ungrazed area. The calculated t value was 2.94. Examiner Only Marks Remark State the null hypothesis for this test. _________________________ _________________________________________________________ State the degrees of freedom. ________________________________ State the probability value for the calculated t. __________________ State your decision about the null hypothesis. ___________________ ______________________________________________________ [4] 3 24.9.05PEG (b) Compare the means and confidence intervals for each of the other two species of grass. Do the differences in the means appear to be significant? Explain your reasoning. Poa annua ______________________________________________ 2 8.8.05ES _________________________________________________________ _________________________________________________________ 1 29.6.05BP Phleum pratense _________________________________________ _________________________________________________________ ______________________________________________________ [2] A2B3AS6 1636 4 [Turn over (c) Suggest explanations for the effect of rabbit grazing on the species of grass in the pasture. Examiner Only Marks Remark _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ ______________________________________________________ [3] (d) Suggest one criticism of the experimental design, and explain how the design might have been improved. _________________________________________________________ _________________________________________________________ _________________________________________________________ 1 29.6.05BP 2 8.8.05ES 3 24.9.05PEG ______________________________________________________ [2] A2B3AS6 1636 5 [Turn over 3 Read the passage below and then use the information in the passage, and your own understanding, to answer the questions which follow. Frogs belong to the phylum Chordata, class Amphibia and the order Anura. Like all amphibians, frogs breathe through a moist skin as well as using lungs. There are about 3500 different species of frog in the world. About half of these live in tropical forests, where conditions favour many diverse lifestyles. As a result, many species have evolved to fill a specific niche. 5 Leaf frogs belong to a group called the phyllomedusines, and are adapted to life in the forest canopy. They have long limbs and have opposable digits on their hands and feet, allowing them to grasp twigs, for which reason some members of the group are called monkey frogs. Leaf frogs are primarily nocturnal and become active at dusk when they will feed on insects. During the day they rest on the surface of leaves. They have 10 large suction pads on the ends of their digits. The red-eyed leaf frog, Agalychnis callidryas, inhabits humid lowland forests of Central America. It is light green in colour with blue-and-yellow striped sides, red feet, a flash of blue on its thighs, and big red eyes. At rest, this frog has its eyes closed and the vividly coloured sides, thighs and feet are normally concealed. But if disturbed, 15 it opens its colourful eyes and displays its bright markings. It will then jump onto another leaf, closing its eyes and concealing its vivid colours. The waxy monkey frog, Phyllomedusa sauvagii, lives in arid scrub forest in South America. Both the dorsal and ventral surfaces are a plain bluish-green with a broken white stripe running down each side of the body. It secretes wax from skin glands and then rubs this over its body. 20 3 24.9.05PEG Red-eyed leaf frog (Agalychnis callidryas) 1 29.6.05BP 2 8.8.05ES Source: http://www.v-artstudio.com/pages/ilsa_frachallidryas.html A2B3AS6 1636 6 [Turn over (a) Explain the term niche (line 5), and describe how the niche of Agalychnis callidryas differs from that of Phyllomedusa sauvagii. Examiner Only Marks Remark _________________________________________________________ _________________________________________________________ _________________________________________________________ ______________________________________________________ [2] (b) Explain why the frog s skin must be moist (line 2) to facilitate gas exchange. Suggest one other adaptation of frog s skin to increase its efficiency as a gas exchange surface. _________________________________________________________ _________________________________________________________ _________________________________________________________ ______________________________________________________ [2] (c) Suggest two ways in which leaf frogs are adapted for life in the trees. 1. _______________________________________________________ _________________________________________________________ 2. _______________________________________________________ ______________________________________________________ [2] 3 24.9.05PEG (d) Leaf frogs are nocturnal (line 9). What can you deduce about the cells which compose the retina of the eye? How is the sensitivity of the retina increased? _________________________________________________________ 2 8.8.05ES _________________________________________________________ _________________________________________________________ 1 29.6.05BP ______________________________________________________ [2] A2B3AS6 1636 7 [Turn over (e) Suggest reasons for the vivid colours of the red-eyed leaf frog, Agalychnis callidryas (lines 13 14). Examiner Only Marks Remark _________________________________________________________ _________________________________________________________ _________________________________________________________ ______________________________________________________ [2] (f) Suggest the advantage to the waxy monkey frog, Phyllomedusa sauvagii, of its wax glands (line 20). _________________________________________________________ _________________________________________________________ _________________________________________________________ 1 29.6.05BP 2 8.8.05ES 3 24.9.05PEG ______________________________________________________ [2] A2B3AS6 1636 8 [Turn over Section B Examiner Only Marks Remark You are expected to answer the following question in continuous prose. Diagrams may be used, but you should make sure that they are relevant and add extra information to your account. It will be marked for its biological content, coverage of the topic, and the quality of written communication. In this question up to two marks are awarded for the quality of written communication. 4 [2] Write an account of the role of pigments in living organisms . Your account should show understanding of at least three topics which you have studied. [13] _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 1 29.6.05BP 2 8.8.05ES 3 24.9.05PEG _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ A2B3AS6 1636 9 [Turn over Examiner Only _____________________________________________________________ Marks Remark _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 1 29.6.05BP 2 8.8.05ES 3 24.9.05PEG _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ A2B3AS6 1636 10 [Turn over Examiner Only _____________________________________________________________ Marks Remark _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 1 29.6.05BP 2 8.8.05ES 3 24.9.05PEG _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ A2B3AS6 1636 11 [Turn over Examiner Only _____________________________________________________________ Marks Remark _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 1 29.6.05BP 2 8.8.05ES 3 24.9.05PEG _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ A2B3AS6 1636 12 [Turn over 1 29.6.05BP 2 8.8.05ES 3 24.9.05PEG THIS IS THE END OF THE QUESTION PAPER A2B3AS6 1636 13 [Turn over 3 24.9.05PEG 2 8.8.05ES 1 29.6.05BP Permission to reproduce all copyright material has been applied for. In some cases, efforts to contact copyright holders may have been unsuccessful and CCEA will be happy to rectify any omissions of acknowledgement in future if notified. S 6/05 4500 302507(73) [Turn over

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Additional Info : Gce Biology May 2006 Assessment Unit A2 3A Module 6A: Synoptic Paper
Tags : General Certificate of Education, A Level and AS Level, uk, council for the curriculum examinations and assessment, gce exam papers, gce a level and as level exam papers , gce past questions and answer, gce past question papers, ccea gce past papers, gce ccea past papers

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