 |
ZLY520S-ZOOLOGY 1- 2ND OPP-JAN 2025 |
|
|
1 Page 1 |
▲back to top |
" nAmIBIA un IVERS ITV
0 F SCIEn CE An D TECHn OLOGY
QUALIFICATION: BACHELOR of NATURAL RESOURCESMANAGEMENT
QUALIFICATIONCODE: 07BNRS
LEVEL:7
COURSE:ZOOLOGY 1
COURSECODE: ZLY520S
DATE: JANUARY 2025
SESSION: 1
DURATION: 3 HOURS
MARKS: 150
SECOND OPPORTUNITY EXAMINATION QUESTION PAPER
EXAMINER(S) Mrs. Gertruida Louisa Theron
MODERATOR: Mr. Helmuth Tjikurunda
INSTRUCTIONS
1. Answer ALLthe questions.
2. Write clearly and neatly.
3. Number the answers clearly.
This paper consists of 5 pages including the front page
|
|
2 Page 2 |
▲back to top |
2
QUESTION 1
Provide the correct term for each of the following.
[10)
1.1 The DNA (genetic material) inside the nucleus of a cell - not yet coiled into
chromosomes.
1.2 The two versions of each gene that an individual inherited from each parent.
1.3 The genetic makeup that is inherited from the parents. EX. BB; bb; Bb
1.4 Animal with NO body cavity. For example, Platyhelminthes.
1.5 Animals where the mouth develops after the anus in the embryo (the second
opening of the blastula becomes the mouth).
1.6 Exterior opening of the water vascular system of echinoderms.
1.7 Integument of mollusks that is covered by, and secretes the shell.
1.8 Common name for the parasitic flatworms belonging to the class Trematoda.
1.9 The blood-like fluid of animals with open circulatory systems.
1.10 The respiratory pigment found in the blood of Gastropods.
QUESTION 2
In each of the following lists, ONE characteristic does not belong with the rest. Write
down the number (only) and the characteristic that doesn't fit.
[10)
2.1 Nematocysts; tentacles; mesoderm; polyp; regeneration
2.2 Fascia/a; ventral sucker; external parasites; incomplete digestive system
2.3 Nereis; hermaphroditic; parapodia; complete digestive system
2.4 Annelida; closed blood circulatory system; dorsal nerve cord; coelomates
2.5 Scorpions; book lungs; nephridia; cephalothorax
2.6 Crab; lpr of antenna; mandibles; decapods, marine crustaceans
2.7 Octopus; external fertilization; foot divided into tentacles; radula
2.8 Brittle stars; regeneration; tube feet; ambulacral groove
2.9 Homocercal tail; shark; spiral valve; internal fertilization
2.10 Frog; 2-chamber heart; respire through skin; protrusible tongue
QUESTION 3
Each of the following sets of characteristics describes a Class. Write down the number
(only) and the Classthat the set refers to.
[10)
3.1 Rows of tube feet; elongated body; tentacles around mouth
3.2 Powerful hind legs; moist skin; external fertilization; webbed feet
3.3 Prostomium; peristomium; setae; parapodia
3.4 Muscular foot; radula; shell consist of 8 plates;
3.5 Telson; carapace; compound eyes; pedipalps
3.6 Proglottids; strobili; hooks; saprozoic
3.7 Placoid scales; spiral valve; internal fertilization; fleshy fins
3.8 Dorsal pores; nephridiopores; clitellum; fertilization in cocoon
3.9 Malphigian tubules; trachea; 3prs of legs; parthenogenesis in some
3.10 Muscular foot; well-developed head; torsion; sensory tentacles
SUB-TOTAL [30)
|
|
3 Page 3 |
▲back to top |
3
SECTION B
QUESTION 4 (Cell division)
4.1 Match the terms below to the descriptions. Note that terms can be used more (3)
than once! You can only use the corresponding LETTER
A= Anaphase
I= lnterphase
M = Metaphase
P = Prophase
T = Telophase
Animal cells begin to pinch in.
Chromatids line up against the equator
Chromosomes are not visible
4.2 Provide the correct term for each of the following descriptions
(3)
The structure that connects the two sister chromatids
A group of two homologous chromosomes that come together to undergo
crossing-over.
Type of cells found in your toes, arms, legs, etc.
4.3 Explain how the daughter cells produced during Mitosis differ from the
(4)
daughter cells produced during Meiosis.
4.4 Make use of drawings to explain the difference between homozygous and
(2)
heterozygous offspring.
[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 short whiskers
mates with a female that is heterozygous black with homozygous long 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 (9)
the Fl generation. Summarize your answers!
5.3 What are the chances (in percentage) for an offspring to be orange with short
whiskers?
(1)
[12]
QUESTION 6
Explain locomotion in each of the following groups:
6.1 Briefly explain how sponges feed.
6.2 Explain the term phagocytosis, as found in sponges.
6.3 Give one UNIQUE characteristic only found in Coelenterata, and give its
function(s).
6.4 Tabulate 3 ways in which the Platyhelminthes are more advanced than the
Coelenterata
6.5 In what way are Nematoda more advanced than the Platyhelminthes?
6.6 Platyhelminthes are acoelomate animals. Explain what this means.
6.7 What characteristic (linked to the phylum name) do all Platyhelminthes share?
6.8 Describe the "head" area of Taenia solium.
(4)
(1)
(3)
(3)
(2)
(1)
(1)
(3)
[18]
|
|
4 Page 4 |
▲back to top |
4
QUESTION 7
State whether the following statements (7.1- 7.2) are True or False
7.1 Nereis is hermaphroditic
(1)
7.2 Polychaete worms have external fertilisation
(1)
7.3 As explained in the flow diagram we discussed in class, in what way are annelids
MORE advanced than nematodes?
(2)
7.4 Name the 3 classes of annelids discussed in class and explain how feeding
differs between the 3 classes.
(6)
7.5 What are the functions (TWO) of the Parapodia, found in polychaete worms?
(2)
[12]
QUESTION 8
8.1 In tabular form, explain FOURdifferences between the horseshoe crab
(Limulus) and the ordinary sea crab.
(8)
8.2 In tabular form, provide 4 differences between the Araneae and the Solpugida.
Also give the common name of each Order.
(4)
8.3 To what order of insects does the corn cricket belong?
(1)
[13]
QUESTION 9
9.1 Name the THREEdistinct body parts of the Mollusca.
(3)
9.2 What is the feeding organ of mollusks called (1), and which class does not have
this organ (1)?
(2)
9.3 Explain the term "torsion" as found in some mollusks.
(2)
9.4 In which class can torsion be seen?
(1)
9.5 The Cephalopoda can be seen as well-developed/advanced molluscs. Discuss
this statement by referring to some of the characteristics that support this
statement.
(6)
[14]
QUESTION 10
10.1 Explain how sea urchins move.
(2)
10.2 What is the feeding apparatus of the sea urchin called?
(1)
10.3 How do sea cucumbers differ from other echinoderms? (4 differences!)
(4)
10.4 To which class do the sea cucumbers belong?
(1)
10.5 Provide two functions for the pedicellariae found in starfish.
(2)
10.6 What are the four components of the water-vascular system found in
Echinoderms?
(2)
[12]
QUESTION 11
Briefly explain how each of the following Teleosts (11.1 and 11.2} is adapted to its
specific way of life.
11.1 Horse mackerel and tuna
(3)
11.2 Eel
(3)
11.3 Explain FIVE of the unique characteristics of sea horses (Hippocampus) that
make them very atypical fishes.
(5)
11.4 Explain six (6) major adaptations of fish to an aquatic lifestyle.
(6)
[17]
|
|
5 Page 5 |
▲back to top |
5
QUESTION 12
12.1 Explain the difference between the feet of frogs and toads and provide a reason
for the difference.
(2)
12.2 Explain how the hind legs of a frog are specialized for jumping.
(3)
12.3 Amphibians are ectothermic animals. What are the advantages of this?
(4)
12.4 Why are there no ovoviviparous frogs?
(1)
[10]
SUB-TOTAL [120]
TOTAL [150]