Download Grade 12 Life Sciences Assessment: Diversity and Change and more Exams Biology in PDF only on Docsity!
Grade 12 Life Sciences Assessment
Total 50 26 May 2009 Time: 50 min
Pupil’s name: ______________________ Class:____________
Examiner: Mrs. C Coetzee and Ms. N du Plooy
Topics covered : Diversity and Change
Question LO 1 (Scientific skills) LO 2 (knowledge and understanding) LO 3 (Science, technology, society and the environment) 1,2 and3 20 4 / 5 /
TOTAL /10 /20 /20 /
Achieveme nt Rating Code COMMENT: _____________________________________________________________
______________________________________________________________
KEY to Achievement ratings
Teacher’s signature ________________
Question 1: Multiple Choice: Write the most correct answer in the space provided below:
1 2 3 4 5 6 TOTA
L
1.1The animals and plants of India are completely different from the species in nearby Southeast Asia. Why might this be true? A. They have become separated by convergent evolution. B. The climates of the two regions are completely different. C. India is in the process of separating from the rest of Asia. D. India was a separate continent until relatively recently. 1.2 Bird guides once listed the myrtle warbler and Audubon’s warbler as distinct species that lived side by side in their ranges. However, recent books show then as eastern and western forms of a single species, the yellow-rumped warbler. Apparently it has been found that the two kinds of warblers... A. Live in the same area. B. Successfully interbreed. C. Are almost identical in appearance. D. Are merged to form a single species. 1.3 There is little fossil evidence of the earliest forms of life because the organisms A. decayed quickly in the oxygen-rich atmosphere. B. did not have hard parts which would fossilise easily. C. evolved so quickly that they left few remains. D. lived in water and were not preserved. 1.4 Rabbits were introduced into Australia by early European settlers, after which they rapidly increased in numbers. The viral disease, myxomatosis, was deliberately introduced into Australia in the early 1950s in an attempt to control rabbit populations. The following table shows the results from an investigation using rabbits selected each year from wild populations and injected with the original disease- causing strain of the virus. These results in the table above support the theory that A. over the years, an increasing number of genetically resistant rabbits survived. B. natural selection occurred between 1955 and 1957 with a peak in 1956. Year % population suffering from fatal symptoms 1952 1953 1954 1955 1956 1957
The different sp%cies mf Finch in dhe picture below
ire(found on t)fferent Galapagos islands qnd aredhought ti have oviginated fzom the meinland of South America.(The} resemBle each other with regard to thuir )nternal body structure, but diffdr with resrect uo the shApes and size of th%ir beaks, géving4rise to different beeding habits. 2.1 ExpLain whát is mdant by tje phbase “geograpHical isolation ov a population “. ( 2 ) 2.2 What factor caused tèe different Fijch speciesto chcnge their eatifg habits and eat dibfarent foods0to each other. ) ‰ ( 1 ) Ehplain th% circumstafces anD process by which thd $afberent species adapted and ¤)evolved to eat eafferent food tyes
foramen magnum bottom view (^) pelvis Some important anatomical differences between Homo , Australopithecus and chimpanzee lateral view Skull Homo Australopithecus Chimpanzee 4.1 A comparison of the 7 anatomical features of oreanisms has 7 helped ócieNtióts to propose evjlutionary relationshi0s. ¤
$*1. Tabu,ate TLREE observable differences between the 3ide(wiew of the skulls of Homo ajd tHe chimpanzee. (8) 4.1.2 Name TWO fossils of Australopithecus found in South Africa. (2) [10] Question 5 5.1 Critically endangered cheetah populations are found in small remote areas in South Africa, East Africa, West Africa and Asia. This leads to inbreeding with its many associated problems. 5.1.1 Explain ONE way in which outbreeding would reduce the problems associated with
inbreeding. (2) 5.1.2 State ONE advantage of inbreeding. (1) 5.2 Explain what is meant by the term 'species'. (3) The map below shows the African distribution of bush pigs and red river hogs which are similar to pigs. Use the information provided to answer the questions that follow. 5.2.1 Give THREE pieces of evidence from the map above which suggests that bush pigs and red river hogs might belong to the same species. (3) 5.2.2 There are pig fossils all over the world. What parts of a pig's body would have fossilised best? Give a reason why. (3) 5.2.3 Scientists use fossils as evidence for explaining theories of evolution. Explain three properties of fossils that allow scientists to do this. (3)
