nAmIB lA UnIVERSITY OF SCIEnCE AnD TECH n 0 LOGY

FACULTY OF NATURAL RESOURCES AND SPATIAL SCIENCE

DEPARTMENT OF AGRICULTURE AND NATURAL RESOURCES SCIENCES

QUALIFICATION: BACHELOR OF NATURAL RESOURCES MANAGEMENT (NATURE

CONSERVATION)

QUALIFICATION CODE: 07BNTC LEVEL: 6

COURSE CODE: NCB510S COURSE NAME: NATURE CONSERVATION BIOLOGY

DATE: 1 JUNE 2016 SESSION: 08HOO- 11HOO

DURATION : 3 HOURS MARKS: 150

FIRST OPPORTUNITY EXAMINATION QUESTION PAPER

EXAMINER(S) Mrs C. Ntesa

MODERATOR: Mrs. G.L. Theron

INSTRUCTIONS 1. Answer ALL the questions.

2. Write clearly and neatly.

3. Number the answers clearly.

PERMISSIBLE MATERIALS

1. Examination question paper

2. Answering book

THIS QUESTION PAPER CONSISTS OF 5 PAGES (Including this front page}

SECTION A

QUESTION 1

Give one word for each of the following terms: [10] 1.1 Cells without a true nucleus. 1.2 A structure producing spores. 1.3 Gametes of same shape and mobility but differ in size. 1.4 A single nuclear division that forms two genetically identical daughter cells, also identical to

the parent cell. 1.5 Haploid cells (N) that fuse to form a zygote. 1.6 Asexual spores formed by Mitosis. 1.7 Two successive nuclear divisions that form four, genetically different, haploid, daughter cells

to shuffle the genetic information from both parents. 1.8 Haploid (n) and diploid (2n) bodies look alike. 1.9 Male gametangium producing sperm. 1.10 The diploid (2n) spore producing phase in organisms that have alternation of generations.

QUESTION 2

Enter the letter of the description in column B which corresponds best to the word (organelle) in column A. Write down only the number and the corresponding letter e.g. 1. z [12]

ColumnA Column B

1 Vacuole A Makes Ribosomes 2 Ribosome B Provides support+ protection to the cell 3 Chloroplast C Prevents wilting 4 Cytoplasm D Controls all activities of the cell 5 Nucleolus E Makes lipids and breaks down carbohydrates 6 Mitochondria F Keep cell organelles in suspension 7 Nucleus G Controls movement in and out of the cell 8 Endoplasmic H Modifies and package proteins

Reticulum 9 Lysosome I Traps light energy to make ATP 10 Golgi Body J Breaks down food and destroys old cells 11 Cell wall K Breaks down glucose to make ATP 12 Cell membrane L Direct traffic in the cell

QUESTION 3

3.1

3.2

In order of least inclusive to most inclusive, write down the main taxa used in the Binomial Classification system. List the 3 Domains and under each Domain list the Kingdom(s) found in that Domain.

(3) (9)

[12]

QUESTION 4

4.1 4.2

Distinguish between a virulent phage and a temperate phage. Re-draw the table below and use it to explain how viruses differ from living cells {Column A) and the similarities they share with living cells {Column B).

Column A Column B

Differ from living organisms: Similar to living organisms:

QUESTION 5

Write a report on the economic and ecological importance of the Eubacteria.

QUESTION 6

6.1

6.2 6.3 6.4

6.5 6.6

Distinguish between the ecto- and endoplasma of the Rhizopoda. Include the function of each. What are the locomotive structures of the Rhizopoda called? What is unique about them? The firm outer layer covering the bodies of Euglena and Trypanosoma is known as the ... ... . . Trypanosoma is the causal agent for ... {a) ... while the ... {b) ... is the vector. On the other hand, ... {c) ... is the causal agent for Malaria and uses the ... {d) ... as transmission agent. Briefly explain how Paramecium feeds. Name the three "plankton" phyla found in the Kingdom Protoctista.

QUESTION 7

Provided is the drawing ofthe life cycle of Ulva with the relevant labels. Write down only the letters

{2)

{7)

[9]

[10]

{4) {2) {1)

{4) {6) {3)

[20]

A-G and the correct answer for each. [7]

-- ' Zygote(;;- "-...... '

I c I ".

Gametangia

I B I ( Ulva Life Cycle) Game=-t::::op=-h::-::yt.-::e-=-s "( 1r::n') ---'

" ~ j-< ,- 1

Zoo•pore• (1o)

~' Ill~~---..::. ,. G

(Type of cell division)

~~,.-~ E

(Type of cell division)

QUESTION 8

Explain Red Tide and comment on the importance thereof.

QUESTION 9

9.1

9.2

9.3

Name and explain Mendel's second law using a suitable example.

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). If a 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 genotypes of both parents. If two of the F1 offspring in question 9.2 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 straight­haired, white guinea pig will be produced.

SUB- TOTAL [100]

SECTION B

QUESTION 10

10.1 Complete the table below comparing these four phyla of Mycota . No need to redraw the

[5]

(3)

(4)

(8)

[15]

table, only number your answers correctly A- J. (10)

Phylum Example Reproduction Ecologicai/Econom i c value

A Bread moulds Asexual by .... (B) and Decomposers Sexual by ... (C)

D Yeasts Asexual by budding and E and F sexual by Ascospores

G Mushrooms Sexual by .. .... (H) Edible, parasitic smuts/rust

Deuteromycota Moulds e.g. Asexual by ...... (1) Penicillum - J Imperfect fungi Penicillum

Aspergillus

10.2 Why are the Deuteromycota referred to as "imperfect fungi"? (1) 10.3 Briefly discuss the ecological role of lichens. (6)

[17)

QUESTION 11

11.1 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. (2)

11.2 Which colours of the spectrum does chlorophyll absorb the most? (1) [3]

QUESTION 12

12.1 Define aerobic respiration. (2) 12.2 Name the three stages of respiration that take place in the mitochondrion of the cell. State

exactly where these stages take place in the mitochondrion and also indicate which ones release C02 and which produces H20 . (9)

12.3 Complete the table below to compare the processes of photosynthesis and respiration. (Redraw the table on your answer sheet). (11)

Photosynthesis Aerobic respiration Type of metabolic reaction Raw materials

End products

Sites involved in the process

Principal electron transfer molecules

QUESTION 13

Explain how the number of leaves; number of stomata, presence of a thick cuticle and relative humidity respectively influence the rate of transpiration.

SUB- TOTAL [SO]

TOTAL [150]

[22]

[8]