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BNS511S - BIOLOGY FOR NATURAL SCIENCES - 2ND OPP - JULY 2023 |
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nAm I BI A u n IVERSITY
OF SCIEn CE TECHn OLOGY
FACULTYOF HEALTH,NATURALRESOURCESAND APPLIEDSCIENCES
DEPARTMENTOF NATURALRESOURCESCIENCES
QUALIFICATION:BACHELOROF NATURALRESOURCEMANAGEMENT
QUALIFICATION CODE: 07BNRS
LEVEL: 7
COURSECODE: BNS511S
COURSENAME: BIOLOGYFORNATURALSCIENCES
DATE:JULY 2023
DURATION: 3 HOURS
MARKS: 150
SECONDOPPORTUNITY/SUPPLEMENTARYEXAMINATION 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.
PERMISSIBLEMATERIALS
1. Examination question paper
2. Answering book
THIS QUESTION PAPERCONSISTSOF 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 Type of mixture where the particles are blended completely.
1.2 Processwhereby a gas changes directly into a solid.
1.3 Type of change that takes place when a banana ripens.
1.4 Elements in group 7 of the Periodic table.
1.5 The organelle/structure that cells use to store slats, ions and sugars.
1.6 The cell organelles that make proteins.
1.7 A deadly virus that brings along rapid lysis of the host cell.
1.8 Special, dehydrated cell formed by bacteria when conditions are unfavourable.
1.9 The opening where food enters the body of Paramecium.
1.10 Hyphae that lack cross walls completely.
QUESTION 2
Explain the difference between the following pairs of terms.
[10]
2.1 Antheridium and Archegonium
2.2
Phenetic classification and phylogenetic classification
2.3
Rough ERand Smooth ER
2.4
Monokaryotic hyphae and Dikaryotic hyphae
2.5
Lysosomes and Vacuoles
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 Solids have more intermolecular force than liquids.
3.2 The horizontal above-ground hyphae found in some fungi is known as a stolon.
3.3 Yeast cells belong to the phylum Deuteromycota and are used in the production of beer.
3.4 The tsetse fly is the causal agent for African Sleeping sickness.
3.5
Mycota have chitin in their cell walls.
3.6
Foraminifera is responsible for RedTide in Namibia.
3.7
Members of the phylum Apicomplexa have an infectious stage known as sporozoit.
SUB-TOTAL (30}
SECTION B
QUESTION 4
4.1
Which is smaller- an electron or a Helium atom?
(1)
4.2
What is the name of the protein found in the human body that helps to transport
Oxygen?
(1)
4.3
Explain the difference between the Atomic number and the Mass number of an atom.
(2)
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4.4
Explain the difference between Locomotion and Movement and provide a good example
for each.
(4)
4.5
Explain the difference between Classification and Nomenclature.
(2)
[10]
QUESTION 5
5.1
For each statement - indicates whether it describes the Lytic OR the Lysogenic cycle of
viral reproduction.
(4)
(a) Viral genes are expressed immediately after the virus infects the host cell.
(b) Many new viruses are assembled.
(c) Viral DNA is integrated into the host cell's chromosomes.
(d) Viruses are released from the host cell by lysis.
5.2
Provide the correct term for each of the following statements:
(3)
(a) The stage in viral reproduction where the host cell actively produces viral genomes.
(b) Structures used by viruses to attach themselves to their hosts.
(c) The stage in viral reproduction where viral genomes and proteins are being put
together to form new viruses.
5.3
Name FOUR (4) ways in which we as humans benefit from bacteria.
(4)
5.4
Explain the difference between saprophytic and parasitic bacteria.
(2)
5.5
Bacteria cannot survive in an environment with less than 15-20% moisture. Explain how
we can use this to our advantage.
(2)
[15]
QUESTION 6
6.1
Name the FOUR (4) Protozoan Phyla discussed in class and provide TWO (2)
unique/identifying characteristics for each.
(12)
6.2
Explain (in detail) how, and on what, Paramecium feeds. Make use of FULLsentences!
(8)
[20]
QUESTION 7
7.1
In your own words - explain what happens during Red tide along the Namibian coast.
Begin by stating which organisms are responsible for RedTide.
(8)
7.2 Although diatoms primarily make use of asexual reproduction, every now and then they
have to go through a cycle of sexual reproduction. Explain why this is necessary.
(2)
[10]
QUESTION 8
8.1
Explain the difference between "Alternation of Isomorphic generations" and
"Alternation of Heteromorphic generations" as found in the life-cycles of seaweed. Also
provide an algal example (Genus names only) for each.
(4)
8.2
Red algae are harvested for two commercially important products. Name these two
products, explain where in the algal bodies the products are found and provide ONE (1)
use that we have for these products.
(4)
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8.3
Explain the ecological importance of kelp forests (Phaeophyta).
(3)
8.4
Write short notes on the ecological and economic importance of green algae.
(4)
[15]
QUESTION 9
9.1
Compare the fruiting bodies of the Ascomycota and the Basidiomycota.
(6)
9.2
In your OWN WORDS- explain the difference between Plasmogamy and Karyogamy.
(Also indicates which process occurs first).
(5)
9.3
Explain the difference between dikaryotic and monokaryotic hyphae.
(2)
9.4
Write a report on the economic importance of the Deuteromycota.
(10)
9.5
Name and compare the different morphological types of lichens found in Namibia.
(12)
[35]
QUESTION 10
10.1 Define diffusion.
10.2 Where do the carbon fixation reactions take place during photosynthesis?
10.3 List the products and waste products produced during the light dependent phase of
photosynthesis.
10.4 Explain how each of the following influence the rate of transpiration:
(a) number of leaves
(b) number of stomata
(c) thickness of the cuticle
(d) relative humidity
(3)
(1)
(3)
(8)
[15]
SUB-TOTAL (120)
TOTAL [150]
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