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Biology · 2005 · November · Paper 2 · HL · Question paper

BiologyQuestion paper2005HLNovember

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This question paper is listed under Biology in the 2005 examination archive. Its catalogue level is HL. The catalogue session is November. The information below helps you identify the document before opening the complete PDF. Subject, year and session labels come from the archive catalogue; the original cover remains the reference if a label differs. A file is not automatically suitable for your current syllabus simply because its subject name matches.

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8805-6002 8 pages N05/4/BIOLO/HP2/ENG/TZ0/XX+ Thursday 10 November 2005 (afternoon) BIOLOGY HIGHER LEVEL PAPER 2  IB DIPLOMA PROGRAMME PROGRAMME DU DIPLÔME DU BI PROGRAMA DEL DIPLOMA DEL BI INSTRUCTIONS TO CANDIDATES • Write your session number in the boxes above. • Do not open this examination paper until instructed to do so. • Section A: answer all of Section A in the spaces provided. • Section B: answer two questions from Section B. Write your answers on answer sheets. Write your session number on each answer sheet, and attach them to this examination paper and your cover sheet using the tag provided. • At the end of the examination, indicate the numbers of the questions answered in the candidate box on your cover sheet and indicate the number of sheets used in the appropriate box on your cover sheet. 2 hours 15 minutes [Personal identifier removed] [Personal identifier removed] 0108 8805-6002 – 2 – N05/4/BIOLO/HP2/ENG/TZ0/XX+ SECTION A Answer all the questions in the spaces provided. 1. In order to prevent transfer of pollen from an anther of one plant to the stigma of the same plant (self-pollination), the sunflower ( Helianthus spp) anther sheds its pollen before the stigma is mature enough to receive it. Early in the morning the anther is exposed by elongation of the filaments. The anthers open at this time to release their pollen (anthesis). The stigma appears above the anthers by late afternoon, and by the following morning it is fully receptive. To see how the filament (F) and the style (S) are affected by light, their lengths were measured at time intervals starting 12 hours before anthesis (–12). Some plants were grown in continuous white light (L24) and some plants grown under cycles of 16 hours white light followed by 8 hours dark (L16/D8). The results are shown in the graph. Light L24 Light Dark Light Dark Light L16/D8 Style length / mm 11 10 9 8 7 6 5 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 Filament length / mm -12 -10 -8 -6 -4 -2 0 2 4 6 8 10 12 14 16 18 20 22 24 26
File information
Subject
Biology
Document type
Question paper
Year
2005
Session
November
Level
HL
Paper
2
Examination zone
Not labelled in the archive
Language
Not labelled in the archive
File size
549 KB
Pages
8
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