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BNS511S - BIOLOGY FOR NATURAL SCIENCES - 1ST OPP -JUNE 2023 |
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nAmlBIA un,vERSITY
OF SCIEnCE Ano TECHnOLOGY
FACULTY OF HEALTH, NATURAL RESOURCES AND APPLIED SCIENCES
SCHOOL OF AGRICULTURE AND NATURAL RESOURCE SCIENCES
DEPARTMENT OF NATURAL RESOURCE SCIENCES
QUALIFICATION: BACHELOR OF NATURAL RESOURCE MANAGEMENT
QUALIFICATION CODE: 07BNRS
LEVEL: 7
COURSE CODE: BNS511S
COURSE NAME: BIOLOGY FOR NATURAL SCIENCES
DATE: JUNE 2023
DURATION: 3 HOURS
MARKS: 150
FIRST OPPORTUNITY EXAMINATION QUESTION PAPER
EXAMINER(S) Mrs. Louise Theron
MODERATOR: Mrs. Clarence Ntesa
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 3 PAGES (Excluding this front page).
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SECTION A
QUESTION 1
Give the scientific term for each of the following:
[10]
1.1 The process whereby a solid changes directly into a gas.
1.2 The number of protons in the nucleus of an atom is known as the ...... number.
1.3 Process used to separate milk from cream (at high speed).
1.4 Atoms of the same element, but with different masses.
1.5 Common name for the Archaebacteria that lives in salt pans.
1.6 What bacteria have in their cell walls - as compared to cellulose found in plant cells?
1.7 The two cycles found in viral reproduction are the lytic cycle and the ....... cycle.
1.8 Type (growth form) of lichens that grow as a thin crust on the surface of rocks.
1.9 Sperm producing gametangium.
1.10 Phylum that Laminaria belongs to.
QUESTION 2
Explain the difference between the following pairs of terms.
[10]
2.1 Isomorphic and heteromorphic
2.2 lsogametes and Oogametes
2.3 Plasmogamy and Karyogamy
2.4 Elements and Compounds
2.5 Isotopes and Ions
QUESTION 3
State whether each of the following statements is True OR False. If the statement is false -
then state False-AND also - re-write the statement to correct it.
[10]
3.1 Impurities lowers the freezing point of a substance and raises its boiling point.
3.2 Porphyra and Ulva are typical examples of an algae that have alternation of isomorphic
generations.
3.3 The process whereby compounds are split up to give simpler substances is known as
synthesis.
3.4 Sperm and eggs are examples of anisogametes.
3.5 The process whereby a solid turns into a gas is known as sublimation.
3.6 Agar and Carrageenan are commercially important cell wall products harvested from
Chlorophyta.
3.7 Compounds can be decomposed by ordinary chemical means.
SUB-TOTAL (30)
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SECTION B
QUESTION 4
4.1 Explain the difference between water-soluble and fat-soluble vitamins and how they
should be taken.
(4)
4.2 What are the building blocks of proteins?
(1)
4.3 In what way are elements in the same group on the periodic table similar?
(3)
4.4 Complete the following: The system for organisms scientific names was first developed
by ..(a).. and this two-word naming system is called ..(b).
(2)
[10]
QUESTION 5
5.1 Explain why viruses are NOT classified into one of the 6 Kingdoms discussed in class.
Provide FIVE (5) reasons!
5.2 Explain the term "Bacteriophage".
5.3 State THREE (3) DIFFERENTways in which viruses affects us humans negatively.
5.4 To which Kingdom do true bacteria belong?
5.5 Provide FOUR (4) characteristics of bacteria.
5.6 Where is the genetic material of a bacterium found?
(5)
(1)
(3)
(1)
(4)
(1)
[15]
QUESTION 6
6.1 Provide the correct term for each of the following statements:
(8)
(a) Motile organs of Amoeba.
(b) Phylum that Amoeba belongs to.
(c) Organelle that regulates the water content inside Amoeba.
(d) Motile organs of Trypanosoma.
(e) The firm, flexible outer layer that protects the body of Euglena.
(f) The motile organs of Paramecium.
(g) The inactive stage in which Euglena survive harsh conditions.
(h) The opening (not the groove) where food enters the body of Paramecium.
6.2 Distinguish between the ecto- and endoplasma of the Rhizopoda. Explain how they
differ and also name the function of each.
(4)
6.3 Briefly explain how Paramecium feeds.
(6)
6.4 Members of the phylum Ciliophora are unique because they are multinucleated
(having more than one nucleus). Provide the function(s) for each of the nuclei.
(2)
[20]
QUESTION 7
7.1 Name the THREE (3) "Plankton" Phyla (Kingdom: Protoctista) discussed in class and
then provide TWO (2) identifying/unique characteristics for each.
7.2 Explain the term "fossil".
(9)
(1)
[10]
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QUESTION 8
8.1 Distinguish between Red Tide and Eutrophication.
{6)
8.2 Provide proper explanations for each of the following terms:
(6)
{a) Gametophyte
{b) Sporophyte
{c) Gametangium
{d) Sporangium
{e) Antheridium
{f) Archegonium
8.3 Explain the following THREE (3) terms, as they relate to algae:
{3)
{a) holdfast
{b) Stipe
[15]
{c) fronds
QUESTION 9
9.1 Provide FOUR (4) differences between fungi {Mycota) and plants {Plantae).
{4)
9.2 Explain the basic body structure of a generic fungus {use mushroom as an example).
Discussthe different parts and refer to the functions of each.
(6)
9.3 How does the feeding of fungi differ from that of most animals and name at least
ONE (1) animal that has similar digestion to that of fungi.
{5)
9.4 What is your understanding of the term mycorrhiza? {What type of symbiosis is found
here?)
{5)
9.5 Compare the morphology of Rhizopus - as an example of Zygomycota with that of
Penicillium - as an example of Deuteromycota. Discussthe similarities AND differences (8)
between them.
9.6 Explain why it is important for us to protect the lichens that grows near Wlotzkasbaken
as well as the ones found on the rocks at Waterberg.
{7)
[35]
QUESTION 10
10.1 Where does the light reaction of photosynthesis take place?
{1)
10.2 Name FIVE (5) internal factors that influence the rate of photosynthesis in a plant.
(5)
10.3 Name the FOUR (4) stages of Respiration and state where in the cell each stages takes
place.
{8)
10.4 Define the term transpiration.
(1)
[15]
SUB -TOTAL (120)
TOTAL [150]
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