nam I 8 I A UnIVERSITY OF SCIEnCE AnD TECHnOLOGY

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1 nam I 8 I A UnIVERSITY OF SCIEnCE AnD TECHnOLOGY FACULTY OF HEALTH AND APPLIED SCIENCES DEPARTMENT OF NATURAL AND APPLIED SCIENCES QUALIFICATION: BACHELOR OF SCIENCE (MAJOR AND MINOR) QUALIFICATION CODE: 07BOSC LEVEL: 6 COURSE: EVOLUTION OF BIOLOGICAL DIVERSITY DATE: JULY 2016 DURATION: 3 Hours COURSE CODE: EBD601S SESSION: MARKS: 110 SECOND OPPORTUNITY EXAMINATION QUESTION PAPER EXAMINER(S) Dr. Jeya Kennedy MODERATOR: Mr. Munyaradzi Zivuku INSTRUCTIONS 1. Write clearly and neatly 2. Number the answers clearly 3. All written work MUST be done in blue or black ink 4. No books, notes and other additional aids are allowed 5. Mark all answers clearly with their respective question numbers THIS QUESTION PAPER CONSISTS OF 6 PAGES (Including this front page) 1

2 QUESTION 1: MULTIPLE CHOICES QUESTIONS [10] 1.1 The movement of reproductive individuals from one population to another result in; a) infertile offspring b) spontaneous mutation c) genetic drift d) gene flow 1.2 Fish populations that do not interbreed because they live in different ponds may evolve into separate species due to; a) ecological isolation b) geographic isolation c) prezygotic isolation d) postzygotic isolation 1.3 The coelacanth is an example of a; a) primitive, fishlike amphibian b) jawless fish c) lobe-finned fish d) ray-finned fish 1.4 Which statement is not true of the basidiomycetes? a) they produce a secondary mycelium with n + n hyphae b) their sexual spores are called basidiospores c) they have a diploid thallus that produces zoospores d) reproduction is ma inly sexual (e they have microscopic basidia 1.5 Choanocytes perform all of the following functions except; a) pumping water into the interior of the sponge b) engulfing and digesting food that is filtered from the water c) passing nutrients to amebocytes d) distributing nutrients throughout the rest of the body 2

3 1.6 An example of a cnidarian in the class Hydrozoa is a; a) coral b) sea anemone c) jellyfish d) Portuguese man-of-war 1.7 Flatworms are the simplest animals with; a) a backbone b) a coelom c) bilateral symmetry d) radial symmetry 1.8 Crustaceans are the only arthropods that have; {1) a) three pairs of legs b) two pairs of feeling appendages on their head c) chitin in their exoskeleton d) chelicerae 1.9 The hairs that project from the exoskeleton of a crayfish are used to; a) create water currents over the surface of the crayfish b) sense vibrations and chemicals in the water c) retain body heat within the crayfish d) protect the crayfish from predators 1.10 An amphibian's mucous glands; a) filter nitrogenous wastes from the blood b) produce enzymes that help break down food c) secrete poisonous substances that repel predators d) supply a lubricant that keeps the skin moist in air 3

4 QUESTION 2: DEFINE THE FOLLOWING TERMS [8] 2.1 Geographic isolation- 2.2 Sporangiophore- 2.3 Amoebocyte- 2.4 Mastax- 2.5 Seta- 2.6 Spiracle- 2.7 Visceral mass- 2.8 Pelage- QUESTION 3: DISTINGUISH BETWEEN THE TERMS IN EACH OF THE FOLLOWING PAIRS OF TERMS. [14) 3.1 Stabilizing selection, directional selection- 3.2 Radiolarians, Foraminiferans- 3.3 Ascocarp, ascus- 3.4 Polyp, medusa- 3.5 Pulmonary respiration, cutaneous respiration- 3.6 Colloblast, apical organ- 3.7 Ganglia, eyespots- 4

5 QUESTION 4: SHORT ANSWER [17] 4.1 What is Plasmogamy and Karyogamy? 4.2 What structure on a rotifer looks like a pair of rotating wheels? What is the function ofthis structure? 4.3 List four examples of arthropod appendages. 4.4 What structural features distinguish dinoflagellates from other algae? 4.5 What two important evolutionary events occurred in fishes about 450 million years ago? 4.6 Identify the two main regions of a typical mollusk's body. Which region contains most of the internal organs? Which region is directly involved with locomotion? (3) 4.7 Identify the function of each of the following parts of the amphibian nervous system: cerebrum, cerebellum, optic lobes, and medulla oblongata. (4) QUESTION 5: ANSWER THE QUESTIONS [16] 5.1 Identify the structures labeled A-Fin the diagram of a tapeworm shown below. (6) 5

6 . ' 5.2 Explain the life cycle of a Zygomycota with the diagram. (10) QUESTIONS 6: EASSY QUESTIONS [45] ANSWER ONLY THREE QUESTIONS FROM THIS SECTION 6.1 Discuss how each of the following microevolutinary forces alters allele frequencies in populations: non-random mating, mutation, genetic drift and gene flow. 6.2 Sketch and describe the unique structure of paramecium. 6.3 Describe the Structure & Function of Starfish. 6.4 Describe the key characteristics of agnatha, chondrichthyes and osteichthyes with two examples each. THE END 6