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ZLY520S - ZOOLOGY 1 - 1ST OPP -NOV 2022 |
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nAmlBIA unlVERSITY
OF SCIEnCE AnD TECHn OLOGY
FACULTYOF HEALTH,APPLIEDSCIENCESAND NATURALRESOURCES
DEPARTMENTOF AGRICULTUREAND NATURALRESOURCESSCIENCES
QUALIFICATION: BACHELOROF NATURALRESOURCESMANAGEMENT
QUALIFICATION CODE: 07BNRS
LEVEL: 7
COURSECODE: ZLY520S
COURSENAME: ZOOLOGY 1
DATE: NOVEMBER 2022
DURATION: 3 HOURS
MARKS: 150
FIRSTOPPORTUNITY EXAMINATION QUESTION PAPER
EXAMINER(S) Mrs. L Theron
MODERATOR: Mr. Helmuth Tjikurunda
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 4 PAGES(Excluding this front page)
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SECTION A
QUESTION 1
Provide the correct term for each of the following.
[10]
1.1 Exterior opening of the water vascular system of echinoderms.
1.2 Excretory structures of earthworms (2/segment).
1.3 The blood-like fluid of animals with open circulatory systems.
1.4 Chemical produced by leeches to prevent blood clotting.
1.5 Most primitive phylum with a complete digestive system.
1.6 The pre-oral segment in annelids.
1.7 Producing eggs that are incubated and hatched within the parent's body, as
with some fishes and reptiles.
1.8 The plate covering the gills of a bony fish.
1.9 Opening on segment 14 of earthworms, where eggs are released
1.10 Integument of molluscs that is covered by and secretes the shell.
QUESTION 2
One word in each of the following lists does not belong with the rest of the words in
that list. Write down the number (only) and the word/term that doesn't fit.
[10]
2.1 Sole; hake; shark; eel; anchovy; pilchard; sea horse
2.2 Parapodia; clitellum; setae; marine; tentacles
2.3 Planaria; bilharzias; leech; tapeworm, liver fluke
2.4 Sea cucumber; five arms; tentacles; leathery texture; anus; tube feet
2.5 Sun spider; poison fangs; powerful chelcerae; leg-like pedipalps; Solpugida
2.6 Polyp; medusa; triploblastic; gastro-vascular cavity
2.7 Nematoda; triploblastic; segments; anus
2.8 Tapeworm; scolex; strobila; ephyra
2.9 Cycloid scales; swimbladder; gills; spiral valve
2.10 Tentacles; jet propulsion; suckers; mantle; muscular foot
QUESTION 3
Eachof the following sets of characteristics describes a Class. Write down the number
(only) and the Class that particular set refers to.
[10]
3.1 Dorso-ventrally flattened; about 34 somites; clitellum; suckers
3.2 Dorso-ventrally flattened; mid-ventral mouth; bilateral symmetry; incomplete
digestive system
3.3 Triploblastic; hooks and suckers; no body cavity; no true segmentation Cestoda
3.4 Tubefeet; anus on oral surface; ambulacral groove; radial symmetry
3.5 Diploblastic; nematocysts; polyp stage; "flower animals"
3.6 Jointed appendages; head+ trunk; poison claws; predacious
3.7 Chelicerae; external fertilization; telson; carapace
3.8 Muscular foot; radula; head reduced; dorso-ventrally flattened
3.9 Prostomium; segments; setae; separate sexes
3.10 "Hedgehog skin"; radial symmetry; external fertilization; no anus
SUB-TOTAL [30]
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SECTION B
QUESTION 4 (Cell division}
4.1 Complete the following table to compare Mitosis and Meiosis. Write down only
the numbers 4.1.1 to 4.1.18 and the answer to each.
(9}
Mitosis
Meiosis
Purpose of the process
4.1.1
4.1.2
# of daughter cells produced
4.1.3
4.1.4
# of divisions
4.1.5
4.1.6
Are the daughter cells genetically 4.1.7
4.1.8
identical OR different to each
other?
Contains homologous
4.1.9
4.1.10
chromosomes? Yes OR No
Types of cells produced (end
4.1.11
4.1.12
product}?
Daughter - cells compared to
4.1.13
4.1.14
parent cells - identical OR
different
Haploid OR Diploid daughter cells 4.1.15
4.1.16
Crossing over occurs - Yes OR No 4.1.17
4.1.18
4.2 Provide the correct term for each of the following.
(3}
4.2.1 The process where the cell begin to split the cytoplasm and the daughter cells
become visible.
4.2.2 The structure that connects the two sister chromatids
4.2.3 IYQg of cells where mitosis takes place
[12]
QUESTION 5. (Genetics}
In Koi fish, black scales (B} are dominant over orange scales (b} and long whiskers (A}
are dominant over short whiskers (a}. A heterozygous black male with long whiskers
mates with an orange female with short whiskers.
5.1 What is the genotype of each parent fish?
(2}
5.2 Using a Punnett square, determine the expected genotypes and phenotypes of
the F2 generation. Summarize your answers!
(8}
[10]
QUESTION 6
6.1 Explain the term "gastro-vascular cavity". Provide one example of an animal
with a gastro-vascular cavity.
(2}
6.2 Use Coelenterata as an example to explain the term "Polymorphism".
(2}
6.3 Explain three primitive characteristics of Coelenterata - as compared to higher
animals.
(6}
6.4 Differentiate between the Porifera, Coelenterata and Platyhelminthes in the
way they "perceive" their environment (sensory/nervous "systems"}.
(6}
[16]
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QUESTION 7
7.1 Tabulate 3 ways in which the Platyhelminthes are more advanced than the
Coelenterata
(3)
7.2 In tabular form, explain 4 difference between the reproductive strategies of the (8)
Polychaeta and the Oligochaeta.
[11]
QUESTION 8
8.1 What are the advantages and disadvantages of having an exoskeleton?
8.2 To what insect order does the mopane worm belong?
8.3 What are the functions of the ovigorous legs, found in Pycnogonida?
8.4 In tabular form, provide 5 differences between the Chilopoda and the
Diplopoda.
(5)
(1)
(2)
(10)
[18]
QUESTION 9
A
B
Questions 9.1, 9.2 and 9.3 refer to the pictures above.
9.1 Does the organism in picture A belong to the same mollusc class as the
organism in picture B? If yes, state the class they both belong to. If no, state
the class each one belong to.
(2)
9.2 Provide TWO characteristics that A and B share with each other, but NOT with
other members of the phylum.
(2)
9.3 Provide TWO differences between A and B
(2)
9.4 In tabular form, provide 4 differences between the Polyplacophora and the
(8)
Bivalvia.
[14]
QUESTION 10
10.1 Name two distinguishing characteristics of the Echinodermata.
(2)
10.2 What are the functions (2) of the pedicellariae found in some echinoderms?
(2)
10.3 Re-draw the following table to compare the Asteroidea and the Ophiuroidea
based on the following: Central disc; Ambulacral groove; Type of feeder and
Opening for egestion.
(8)
Asteroid ea
Ophiuroidea
Central disc
Ambulacral groove
Type of feeder
Opening used for
egestion
[12]
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QUESTION 11
11.1 Name 3 reasons why a sea squirt, a cephalochordate and a sea cow all belong
to the same phylum. Also name the phylum they belong to.
(4)
11.2 Explain the functions of the following features in fish.
(6)
(a) Nose
(b) Lateral line
(c) Swim-bladder
(d) Caudal fins
(e) Pectoral fins
11.3 What type of scales do you find in Chondrichtyes?
(1)
11.4 Briefly explain how each of the following teleosts is adapted to its specific way
of life.
(4)
(a) Angler fish (2)
(b) Sole (2)
[15]
QUESTION 12
12.1 What is the distinguishing characteristic of the ClassAmphibia?
(1)
12.2 Why does one not find many amphibians in the desert?
(3)
12.3 Discuss4 major adaptations that allowed amphibians to move from water to
land. Use proper explanatory sentences.
(8)
[12]
SUB-TOTAL [120]
TOTAL [150]
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