I'IFIITII BIR UI'IIVERSITY

OF SCIENCE RI'IDTECHI'IULOGY

Department of Agriculture and Natural Resources Sciences

QUALIFICATION: Bachelor of Natural Resource Management (Nature Conservation)

QUALIFICATION CODE: O7BNTC LEVEL: NQF Level 5

COURSE: Nature Conservation Biology COURSE CODE: NCB5IOS

DATE: 8 June 2017

DURATION: 3Hours MARKS: 150

FIRST OPPORTUNITY EXAMINATION QUESTION PAPER

EXAMINER: Mrs. G.L. Theron

MODERATOR: Mrs C Ntesa

THIS QUESTION PAPER CONSISTS OF 3 PAGES

(EXCLUDING THIS FRONT PAGE)

INSTRUCTIONS

1. Answer ALL the questions.

2. Write clearly and neatly.

3. Number the answers clearly.

PERMISSIBLE MATERIALS

1. Examination paper.

Examination script.

QUESTION 1

Give one word for each of the following terms:

1.1 Cell organelle that prevents wilting.

1.2 Phylum of Protozoa with tw_o_ nuclei.

1.3 Feeding on whole or living food, for example Amoeba.

1.4 Cell organelles that are responsible for modifying and packaging proteins.

1.5 Motile structure used by Trypanosoma.

1.6 Cell wall component of brown algae used in paints.

1.7 Gametes of same shape and mobility but differ in size.

1.8 Haploid (n) and diploid (2n) bodies in the life-cycle differ in appearance.1.9 A small thick-walled resting cell that forms inside a bacterial cell.

1.10 A medication that can kill bacteria without harming a person’s own cells.

QUESTION 2

Distinguish between the following sets of terms:

2.1 Movement and Locomotion

2.2 Zoospores and Aplanospores

2.3 Lysosomes and Vacuoles

2.4 Halophiles and Thermophiles

2.5 Phenotype and Genotype of an organism.

2.6 Crustose and Fruticose lichen types

QUESTION 3

3.1 Distinguish between a virulent phage and a temperate phage.3.2 Name the different steps in the reproduction of viruses and explain exactly (fully) what

happen in each step.

QUESTION 4

Although only unicellular, prokaryotic organisms, bacteria are very important to us as well as to the

environment. Discuss 8 ways in which bacteria are useful to us or the environment and 2 ways in

which they are harmful.

QUESTION 5

Enter the letter of the description in column B which corresponds best to the word in column A.

Write down only the number and the corresponding letter e.g. 1. z

Column A Column B

1 Metaphase A DNA replication takes place.

2 Synapsis B A single nuclear division to form two genetically identical

daughter cells that are identical to the parent cell.

3 Antheridium C Chromatids move towards opposite poles.

4 Mitosis D Two successive nuclear divisions to form four genetically

different, haploid daughter cells.

5 Archegonium E Gametes that looks alike. They are the same shape, size

and mobility.

6 Interphase F Gametes differ in shape, size and mobility.

7 lsogametes G Duplicated chromosomes line up on the midplane.

8 Anaphase H Gametangium producing eggs.

9 Meiosis | Gametangium producing sperm.

10 Oogametes J Connecting of homologous chromosomes to form a tetrad.

[10]

[12]

(2)

(13)

[15]

[10]

[10]

QUESTION 6

6.1 Name the four "Protozoa” phyla found in the Kingdom Protoctista.

6.2 Explain the difference between the ectoplasma and endoplasma of Amoeba. Also refer to

the function of each.

6.3 Distinguish between the feeding methods of Eugleno and Tryponosoma.6.4 Briefly explain the importance of Dinoflagellates for us as Namibians.

6.5 Provided is a drawing of the life cycle of Laminaria (Phylum Phaeophyta). Provide the

correct labels by writing down only the letters A-J and the correct answer for each.

D Typeof cell

division

J Type of cellA division

I Process

QUESTION 7

7.1 Provide four (4) different examples of how humans make use of fungi to enhance their lives.

7.2 Explain the negative effects of bracket fungi, ecologically as well as economically.7.3 Provided is a drawing of the life cycle of a member from the phylum Ascomycota. Provide

the correct labels by writing down only the letters A-H and the correct answer for each.

B‘

80I 00 0

Annual

nproducllg’nu

«r.

‘—/

AI

0"iv.

H Eight of them

.0\

e /.- g!I Q 0/ “56/

GTVpe 0f hyphag

. were; ,r %:L V" ' "'§’,}

QUESTION 8

8.1 Name and explain Mendel’s second law using a suitable example.8.2 In Guinea pigs straight hair is recessive to curly hair, but a black coat colour is dominant

over a white coat colour. (Use the letter “B" for coat colour and the letter ”T" for

straight vs curly hair).

lfa pure black, straight-haired female is mated with a white, curly-haired (pure) male,what will be the genotype and phenotype of the F1 offspring? Also provide the genotypesof both parents.

(4)

(2)

(5)

(10)

[25]

(4)

(3)

(8)

[15]

(3)

(2)

8.3 If two of the F1 offspring in question 8.2 mate, what is the chance that a straight-haired,white guinea pig will be produced in the F2 generation?

First show the genotypes of both parents (F2 generation) and use a Punnett square to

determine the phenotypes of the F2 generation. Then indicate the chance that a straight-

haired, white guinea pig will be produced.

QUESTION 9

Write a sentence to define the following:9.1 Photosynthesis

9.2 Aerobic respiration

9.3 Diffusion

9.4 Osmosis

QUESTION 10

10.1 Give the chemical formula to describe the process of photosynthesis.10.2 The photosynthesis process takes place in two main sets of reactions. Name these reactions

and also state in which part of the chloroplasts each takes place.10.3 What is the Calvin Cycle and where does it take place?

QUESTION 11

Aerobic respiration takes place in four main stages. Briefly discuss the first two stages: 1) glycolysisand 2) Formation of Acetyl Coenzyme A. Make reference to what the process entails i.e. where it

takes place, the products at the end of the process.

QUESTION 12

12.1 Briefly describe the water pathway/movement in a plant during the process of transpiration.12.2 Briefly discuss five (5) factors that influence the process of transpiration. Stating how each

affects the process of transpiration in plants.

TOTAL [150]

(8)

[13]

(2)

(2)

(2)

(2)

[8]

(3)

(2)

(2)

[7]

[10]

(5)

(10)

[15]