Biology · 2015 · May · Paper 3 · HL · TZ2 · Question paper

M15/4/BIOLO/HP3/ENG/TZ2/XX Instructions to candidates • Write your session number in the boxes above. • Do not open this examination paper until instructed to do so. • Answer all of the questions from two of the Options. • Write your answers in the boxes provided. • A calculator is required for this paper. • The maximum mark for this examination paper is [40 marks]. Option Questions Option D — Evolution 1 – 3 Option E — Neurobiology and behaviour 4 – 6 Option F — Microbes and biotechnology 7 – 9 Option G — Ecology and conservation 10 – 12 Option H — Further human physiology 13 – 15 26 pages © International Baccalaureate Organization 2015 Biology Higher level Paper 3 Thursday 7 May 2015 (afternoon) 1 hour 15 minutes [Personal identifier removed] 28EP01 – 2 – M15/4/BIOLO/HP3/ENG/TZ2/XX 28EP02 Option D — Evolution 1. The evolution of increased body size in mammals has been accompanied by an increase in life span. Another variable that could affect life span is brain size. Data was analysed from 47 mammalian species.Maximum life span / yr 102 101 100 Key: Homo sapiens other primates insect eaters carnivores hoofed mammals rodents other placental mammals marsupials 10–1 10 0 10 1 10 2 10 3 10 4 Brain mass / g [Source: Hofman, M. A. (1993), Encephalization and the evolution of longevity in mammals. Journal of Evolutionary Biology, 6: 209–227. doi: 10.1046/j.1420-9101.1993.6020209.x] (a) State the relationship between brain mass and maximum life span. [1] ..................................................................... ..................................................................... (Option D continues on the following page)