International Advanced Level Biology - Edexcel

1 Centre NumberCandidate NumberWrite your name hereSurnameOther namesTotal MarksPaper ReferenceP48416A 2017 Pearson Education *P48416A0124*BiologyAdvanced SubsidiaryUnit 2: Development, Plants and the EnvironmentTuesday 6 June 2017 AfternoonTime: 1 hour 30 minutesWBI02/01 You must have: Calculator, HB pencil, Use black ink or ball-point pen. Fill in the boxes at the top of this page with your name, centre number and candidate number. Answer all questions. Answer the questions in the spaces provided there may be more space than you The total mark for this paper is 80.

2 The marks for each question are shown in brackets use this as a guide as to how much time to spend on each question. Questions labelled with an asterisk (*) are ones where the quality of your written communication will be assessed you should take particular care with your spelling, punctuation and grammar, as well as the clarity of expression, on these questions. Candidates may use a Read each question carefully before you start to answer it. Keep an eye on the time. Try to answer every question.

3 Check your answers if you have time at the Edexcel InternationalAdvanced LevelTurn over 2*P48416A0224* DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREAA nswer ALL questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then mark your new answer with a cross .1 The photograph below shows a plant cell as seen using an electron 20 000 (a) Place a cross in the box next to the number of structures labelled in the photograph that would also be present in an animal cell.

4 (1) A 1 B 2 C 3 D 43*P48416A0324*Turn over DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA (b) The table below shows some features of plants cells and prokaryotic cells. For each feature, place one cross in the appropriate box, in each row, to show whether it is found in plant cells only, prokaryotic cells only or in both plant cells and prokaryotic cells.

5 (3)FeaturePlant cellsProkaryotic cellsPlant cells and prokaryotic cellscellulose cell wallnucleusribosomes (c) Some plant cells contain plasmodesmata. Describe the structure of plasmodesmata.(2)..(Total for Question 1 = 6 marks)4*P48416A0424* DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA2 The diagram below shows a sperm (a) Name the structure labelled P.(1).. (b) Place a cross in the box next to the structure that contains mitochondria.

6 (1) A P B Q C R D S (c) Place a cross in the box next to the structure or structures that contain DNA.(1) A P only B P and R C Q only D Q and R (d) Describe the role of structure S.(2)..5*P48416A0524*Turn over DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA *(e) Explain the role of meiosis in the production of genetically variable sperm cells.

7 (5)..(Total for Question 2 = 10 marks)6*P48416A0624* DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA3 Plant-based plastics are being developed to replace oil-based plastics. Sugar and corn crop plants have been used to make some of these plant-based plastics. (a) Give two advantages of using plant-based plastics compared with oil-based plastics.(2)1 ..2 .. (b) Research has shown that the production of plant-based plastics may not be as environmentally friendly as the production of oil-based plastics.

8 The graphs below show the relative effects on eutrophication and on damage to the ozone layer of producing two oil-based plastics, A and B, and of producing two plant-based plastics. Eutrophication is damage caused to lakes and rivers by using too much fertiliser. The ozone layer helps to reduce ultraviolet light from the Sun reaching the Earth s surface. Key oil-based plastic A oil-based plastic B sugar-based plastic corn-based 0 Relative effect on eutrophicationType of 0 Relative effect on the ozone layerType of plasticGraph 1: effect on eutrophicationGraph 2.

9 Effect on the ozone layer7*P48416A0724*Turn over DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA Using the information in the graphs and your own knowledge, discuss whether the production of plant-based plastics is less environmentally friendly than the production of oil-based plastics.(4)..8*P48416A0824* DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA (c) Fertilisers are spread on the land to supply plants with the inorganic ions that they require for growth.

10 Explain how plants use named inorganic ions.(3).. (d) Ultraviolet light has been shown to increase the risk of skin cancer. Suggest how skin cancer is the result of an interaction between genotype and the environment.(3)..(Total for Question 3 = 12 marks)9*P48416A0924*Turn over DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREABLANK PAGE10*P48416A01024* DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA4 The diagram below shows some of the stages in the formation of an cellegg cellfertilisationzygoteseveral mitotic divisionsmorulacell division and