FACUL TV OF EDUCATIONEdgewood Campus

SCHOOL OF SCIENCE, MATHEMATICS ANDTECHNOLOGY EDUCATION

BACHELOR OF EDUCATIONEXAMINATIONS - JUNE 2011

Year of Study: 1st and 2nd Phase/Group: FET/Senior

Module: Biological Science forEducators 210

Code: EDBS210E1

Duration: 2.5 hours Marks: 150

Internal Examiner: Dr A. James Internal Moderator: Dr R. Mudaly

INSTRUCTIONS

• Answer all questions in the answer book provided.

• Candidates are requested, in their own interests,

to write LEGIBLY.

• You may start with any question. Do ensure that

you number a" questions correctly.

• This paper consists of SIX pages and FOUR

questions.

QUESTION 1

1.1. During unit 1 you read an article on Maggot Debridement Therapy.

The following is a quote from the reading. Read the quote and answer the

questions that follow:

"Maggots were feeding off the wounds of soldiers"

(Williams, 2006, p. 4).

1.1.1. Use the quote to distinguish between an invention and a discovery. (6)

1.1.2. Describe the impact of this therapy today. (4)

1.1.3. Maggots were used in many Biological investigations in the past.

1.1.3.1. Name an investigation from the past where maggots were used. (1)

1.1.3.2. Explain the implications of this investigation in the history of Biology. (6)

1.2. At the beginning of the module students were asked to write down

their understanding of Biology. Read and critique the following

sentence written by a student:

" Biology helps us to understand the animals around us". (6)

[23]

QUESTION 2

2.1. Levels of Organisation of matter are organized as a hierarchy.

Explain, using suitable examples, why it is organized in this way. (6)

2.2. Earth is the only planet, to our present knowledge, that has life on it.

2.2.1. Briefly describe THREE conditions of the earth that makes it suitable for

living organisms to exist today. (6)

2.2.2. The conditions of the earth when life originated were different to the

conditions today. Describe, giving evidence, TWO conditions that were

present then. (4)

2.2.3. Spontaneous Generation is one of the theories used to explain the

origin of life on earth. Aristotle and von Helmont supported this theory.

Explain the contribution that each person made to this theory. (6)

2.2.4. Pasteur claimed that 'Life could only come from life (living)'.

Study the investigation set-up below to explain the claim

that he made. (5)

2.3. During the module we worked with elements and compounds. Use the

periodic table in Appendix A to answer the following questions:

2.3.1. Name two elements and state the: (a) atomic mass number;

(b) atomic number of each (4)

2.3.2 The compound HCI is formed from two elements.

(a) Illustrate the structural (chemical) formula for this compound. (5)

(b) Explain the bonding type that is present in this compound. (3)

(c) Explain what pH of HCI means. (3)

2.4. The following structural formula represents a protein. Study the

representation and answer the questions that follow:

2.4.1. Give ONE reason why this is an organic compound.

2.4.2. Give TWO reasons why this is a protein compound.

(1)

(2)

[45]

QUESTION 3

3.1.1. Tabulate TWO differences between an electron microscope and a light

microscope. (5)

3.1.2. Explain why these differences are important for the working of each of

these microscopes. (2)

3.2. Study the information in the table below and answer the questions that

follow:

Cell type Cell length or diameter (micrometres)

Human egg 100

Sea urchin egg 70

Bacillus bacterium 3

Paramecium 50

yeast 8

3.2.1. What is the size of the sea urchin egg in millimetres? (2)

3.2.2. How many times larger is the human egg than a Bacillus cell? (2)

3.2.3. Which of the organisms above have prokaryotic cells? (2)

3.2.4. Write a short description of prokaryotic cells. (2)

3.3. You made a model of a particular cell organelle.

3.3.1. State why you chose to make a model of this cell organelle? (2)

3.3.2. Briefly describe the structural and functional features that this organelle

has. (8)

3.4. If you were asked to make a stained wet mount of a moss leaf and to

observe it, using a stereoscopic compound light microscope then:3.4.1 Briefly describe how you could use the microscope to observe the wet

mount. (4)

3.4.2. Describe the procedure that you could follow to calculate the

magnification of:

a. the observed specimen and 2

b. your drawing. 2 (4)

3.5. Study the structure of the fluid mosaic model of a membrane below and

answer the questions that follow:

1

3.5.1.

3.5.2.

(3)

membrane? (6)

[42]

QUESTION 4

4.1. Linnaeus' system of Classification and Binomial nomenclature were

important developments in Biology. Discuss this statement using

examples and experiences of its importance today. (7)

4.2. Study the cladogram below and answer the questions that follow:

c

Rodents& rabbits Crocodiles Biros

4.2.1. Briefly describe how this cladogram was constructed. (3)

4.2.2. Describe the relationships that are evident among the organisms labeled

A, B, C and D. (6)

4.3. Study the diagrams of organism below that are labelled E, F, G, H.

E F

1-3cm

145-152cm

G H

4.3.1. Name each organism. (4)

4.3.2. (a) Classify each organism according to its Phylum and

Division/Class. (8)

(b) Give a reason for each response. (4)

4.3.3. Draw a linear dichotomous key that could be used to classify these

organisms. (8)

[40]

TOTAL - 150 MARKS

Representative elements

HalogensAlkali Alkalinemetals earth

~ metals

1 jPeriod Groupnumber lA

Noblegases

~18

Group8A

2

13 14 15 16 17Group Group Group Group Group

3A 4A SA 6A 7A7, 8

N···O]6.00

9 10

F Ne19.00.' . 20.18

'2

He4.003

Transition elements ----------,

.~, 17 18

CI,Ar35.45~.· 39.95

3

4. 35'-- 36

Br' Kr83.80

S54Xe

6

7

[Actinides

! 7!?·~'.- Metals :.:,-c:", Metalloids Nonmetals

Name Atomic(Symbol) Number, -- ---.-' ..~-.-~

Actinium (Ac) 89 Cobalt (Co) 27 Iodine (I) 53 Osmium (Os) 76 Silicon (Si) 14Aluminum (AI) 13 Copper (Cu) 29 Iridium (Ir) 77 Oxygen (0) 8 Silver (Ag) 47Americium (Am) 95 Curium (Cm) 96 Iron (Fe) 26 Palladium (Pd) 46 Sodium (Na) 11Antimony (Sb) 51 Darmstadtium (Ds) 110 Krypton (Kr) 36 Phosphorus (P) 15 Strontium (Sr) 38Argon (Ar) 18 Dubnium (Db) 105 Lanthanum (La) 57 Platinum CPt) 78 Sulfur is) 16Arsenic (As) 33 Dysprosium (Dy) 66 Lawrencium (Lr) 103 Plutonium (Pu) 94 Tantalum (Ta) 73Astatine (At) 85 Einsteinium (Es) 99 Lead (Pb) 82 Polonium (Po) 84 Technetium (Tc) 43Barium (Ba) 56 Erbium (Er) 68 Lithium (Li) 3 Potassium (K) 19 Tellurium (Te) 52Berkelium (Bk) 97 Europium (Eu) 63 Lutetium (Lu) 71 Praseodymium (Pr) 59 Terbium (Tb) 65Beryllium (Be) 4 Fermium (Fm) 100 Magnesium (Mg) 12 Promethium (Pm) 61 Thallium (Tl) 81Bismuth (Bi) 83 Fluorine (F) 9 Manganese (Mn) 25 Protactinium (Pal 91 Thorium (Th) 90Bohrium (Bh) 107 Francium (Fr) 87 Meitnerium (Mt) 109 Radium (Ra) 88 Thulium (Tm) 69Boron (B) 5 Gadolinium (Gd) 64 Mendelevium (Md) 101 Radon (Rn) 86 Tin (Sn) 50Bromine (Br) 35 Gallium (Ga) 31 Mercury (Hg) 80 Rhenium (Re) 75 Titanium (Ti) 22Cadmium (Cd) 48 Germanium (Ge) 32 Molybdenum (Mo) 42 Rhodium (Rh) 45 Tungsten (W) 74Calcium (Ca) 20 Gold (Au) 79 Neodymium (Nd) 60 Rubidium (Rb) 37 Uranium (U) 92Californium (Cf) 98 Hafnium (Hf) 72 Neon (Ne) 10 Ruthenium (Ru) 44 Vanadium (V) 23Carbon (C) 6 Hassium (Hs) 108 Neptunium (Np) 93 Rutherfordium (Rf) 104 Xenon (Xe) 54Cerium iCe) 58 Helium (He) 2 Nickel (Ni) 28 Samarium (Sm) 62 Ytterbium (Yb) 70Cesium (Cs) 55 Holmium (Ho) 67 Niobium (Nb) 41 Scandium (Sc) 21 Yttrium (Y) 39Chlorine (CI) 17 Hydrogen (H) 1 Nitrogen (N) 7 Seaborgium (Sg) 106 Zinc (Zn) 30Chromium (Cr) 24 Indium (In) 49 Nobelium (No) 102 Selenium (Se) 34 Zirconium (Zr) 40

-'. ",-,- ..... "~~,~,.-.~ .-- - ~~.-~