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BNS511S - BIOLOGY FOR NATURAL SCIENCES - 2ND OPP -JULY 2022 |
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nAm I Bl A un IVERSITY
OF SCIEnCE Ano TECHnOLOGY
FACULTYOF HEALTHAND APPLIEDSCIENCESAND NATURALRESOURCES
DEPARTMENTOF AGRICULTUREAND NATURALRESOURCESSCIENCES
QUALIFICATION:BACHELOROF NATURALRESOURCEMANAGEMENT
QUALIFICATIONCODE: 07BNRS
LEVEL: 5
COURSECODE: BNSSllS
COURSENAME: BIOLOGYFORNATURALSCIENCES
SESSION:JULY2022
DURATION: 3 HOURS
PAPER:THEORY
MARKS: 150
SUPPLEMENTARY/SECONDOPPORTUNITYEXAMINATION QUESTIONPAPER
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. All written work MUST be done in blue or black ink
2. No books, notes and other additional aids are allowed
THIS QUESTION PAPERCONSISTSOF 5 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 Feeding on whole or living food, as Amoeba does.
1.3 Cell organelle that is responsible for modifying and packaging proteins.
1.4 Motile structure used by Trypanosoma.
1.5 Gametes of same shape and mobility but differ in size.
1.6 Haploid (n) and diploid (2n) bodies in the life cycle differ in appearance.
1.7 A small thick-walled resting cell that forms inside a bacterial cell.
1.8
Medication that kill bacteria without harming a person's own cells (General term!)
1.9
Lichens that grow as a thin crust on the surface of rocks.
1.10 Sperm producing gametangium.
QUESTION 2
Complete the following sentences by filling in the missing word(s). Do not re-write the
sentences; only write down the letters (a)- (j) and the correct answer for each.
[10]
...(a) ... classification is done purely on the basis of appearance. (The old approach) .
...(b) ... is the scientific study of the diversity of organisms and their evolutionary relationships .
...(c) ... is the science of describing, naming and classifying living organisms.
...(d)... is the procedure of assigning names to the different kinds and taxa of living organisms.
...(e) ... (name of scientist) simplified scientific classification by developing the ...(f)... (system) in
which each species is assigned a unique ...(g)... name.
A ...(h) ... is a group of individuals which are naturally reproductively isolated from other such
groups.
Prokaryotes lack an organized ...(i) ... and membrane bound organelles and have cell walls
containing ...(j) ....
QUESTION 3
Explain the difference between the following pairs of terms.
[10]
3.1
Lysosomes and Vacuoles
3.2
Chemosynthetic bacteria and photosynthetic bacteria
3.3
Foliose lichens and Fruticose lichens
3.4 Ascocarp and Basidiocarp
3.5
Zoospores and Aplanospores
SUB-TOTAL (30}
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SECTION B
QUESTION 4
Provide the correct term for each of the following definitions/descriptions.
[8]
4.1
The process whereby a gas is cooled, the movement of the particles slowed down and
eventually a liquid is formed.
4.2
A protein found in the human body that helps to transport Oxygen.
4.3
Fats with multiple double bonds between multiple carbons in the molecule.
4.4
A solution that contains as much solute as can be dissolved at a particular temperature.
4.5
Atoms of the same element, with the same number of protons, but different number of
neutrons.
4.6 An atom that have gained one or more electrons.
4.7 An element that consists naturally as a two-atom molecule, for example Hydrogen.
4.8
The elements in Group 7 on the periodic table.
QUESTION 5
Say whether each of the following statements is TRUEor FALSE.If false - re-write the statement
to correct it.
[12]
5.1
The kinetic theory of matter stated that the higher the temperature, the lower the
average kinetic energy of the particles.
5.2
The kinetic energy of molecules is highest in gases and least in liquids.
5.3
Melting ice cubes on the stove is an example of an exothermic reaction.
5.4
Impurities lowers the freezing point of a substance and raises its boiling point.
5.5
Compounds can be decomposed by ordinary chemical means.
5.6
The process whereby compounds are split up to give simpler substances in known as
synthesis.
5.7
The atomic number tells you how many protons and neutrons there are in the nucleus of
an atom.
QUESTION 6
6.1
Distinguish between a virulent phage and a temperate phage.
(2)
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6.2
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).
(7)
A Differ from living organisms
B Similar to living organisms
[9]
QUESTION 7
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 to us and/or the environment.
[10]
QUESTION 8
8.1
Distinguish between the feeding methods of Amoeba and Plasmodium.
Also name the !Y,Qg of feeding found in each.
8.2
Name the causal agent, as well as the vector for Ngana.
8.3
The opening (not the groove) where food enters the body of Paramecium is known as
the ........
8.4
Provide examples of the common harmful effects of HAB's (harmful algal blooms).
8.5
Briefly comment on the economic and ecological importance of the Bacillariophyta.
(4)
(2)
(1)
(4)
(4)
[15]
QUESTION 9
Without re-drawing the table below-fill in the missing answers. Only write down the letters (a)
- (n) and the correct answer for each.
[14]
Phylum
Example:
Distinguishing
characteristic
Pellicle absent
or present?
Feeding
structures
(a)
Amoeba
(e)
(h)
Pseudopodia
Euglenozoa
(c)
(f)
Present
(j)
(b)
Plasmodium
Sporozoits
(i)
(k)
Ciliophora
(d)
(g)
Present
Cilia in oral
groove
Locomotive
Pseudopodia
( I)
structures?
(m)
(n)
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QUESTION 10
10.1 Write a report on the ecological (8) and economic (4) importance of the Kingdom
Mycota.
(12)
10.2 Explain the importance of "bracket fungi"
(4)
10.3 Mushrooms e.g. Agariscus campestris, reproduce by special spores on the gills of the
fruiting body. Provide labels for D to I (only) on the diagram below.
(6)
[22]
D
E
F
G
SECTION C
QUESTION 11
11.1 List the products and waste products produced during the light dependent phase of
photosynthesis.
(3)
11.2 Where do the carbon fixation reactions take place during photosynthesis?
(1)
11.3 State one disadvantage of a plant leaving their stomata open and discuss how the plant
solves this problem.
(3)
11.4 Discuss how temperature and light intensity affect the rate of photosynthesis in plants.
(4)
[11]
QUESTION 12
12.1 The Citric acid cycle is the third stage of respiration. State where stage 3 occurs and
name the products and their quantities.
(5)
12.2 Name the three other stages of respiration.
(3)
[8]
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QUESTION 13
13.1 Define diffusion.
(3)
13.2 Explain how each of the following influence the rate of transpiration:
(8)
(a) number of leaves
(b) number of stomata
(c) thickness of the cuticle
(d) relative humidity
[11)
SUB-TOTAL [30)
TOTAL [150)
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