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Szl 101: Invertebrate Zoology Question Paper

Szl 101: Invertebrate Zoology

Course: Invertebrate Zoology

Institution: University Of Nairobi question papers

Exam Year:2013

UNIVERSITY OF NAIROBI
FIRST SEMESTER EXAMINATIONS 2013/2014
(Chiromo campus)
FIRST YEAR EXAMINATIONS FOR THE DEGREE OF BACHELOR OF SCIENCE
SZL 101: Invertebrate zoology
Date: august 29, 2013
Time: 9:00 A.M- 11:00 A.M
Instructions:
ANSWER ANY TEN (10) QUESTIONS. EACH 10 MARKS
DIAGRAMS SHOULD BE USED WHEREVER THEY SERVE TO ILLUSTRATE AN ANSWER

1. A. List 6 characteristics of living things that distinguish them from non- living things
b. name the 4 major elements found in all living things.
2. a) discuss the osmotic challenges facing invertebrates living in the following environments and explain how they cope with the challenges:
i) fresh water
ii) sea water
b) explain how terrestrial invertebrates overcome the problem of excessive water loss.
3. a) explain why it advantageous for terrestrial invertebrates to excrete urea and uric acid instead of ammonia.
b) explain why the largest invertebrates are usually found in the sea instead of fresh water and terrestrial environments.
c) marine invertebrates lay their eggs in water and fertilization is external. Explain the factors that makes it possible.
4. a) mention 4 benefits of invertebrates to mankind.
b) define the following terms.
i) taxonomy
II) systematic
III) species
5 a) explain the difference between cyclical and mechanical transmission in trypanosomes
b) explain the difference in transmission between the salivarian and stercocarian trypanosomes
c. name he disease caused by Trypanosoma cruzi
6 a) name 4 developmental stages of malaria parasites found in the mosquito vector
b) explain the meaning of the following terminologies:
i) pre- patent period
ii) incubation period
d) Mention 2 sites in the human body where malaria parasites multiply during their development cycle.
7 explain the 5 developmental stages of a trematode life cycle outside its definitive host.
8 a) discuss 4 methods of asexual reproduction in sponges
b) explain the environmental importance of sponges.
9 a) name 4 cell types found in the gastrodermis of cnidarians
b) explain what zoochlorella and zooxanthellae are and their functions.
c) mention 2 functions of the gastrovascular cavity.
10 explain 5 advantages of having a body cavity in invertebrates.
11. A) name the 6 pairs of appendages in the prosoma of the class arachnida
B) which external structure is absent in chelicerata but is present in all other arthropods?
c) Mention the morphological difference between larval and adult tick.
12. a) name 2 cow muscles that are predilection sites of cysts of Taenia saginata
b) explain 2 ways by which humans get infected by hydatid cysts of Echinococcus granulosus
c) mention 3 ways of controlling E. granulosus
13. a) explain 4 developmental patterns that occur in insects.
b) by which organs do insects perform the following function?
i) excretion
ii) respiration
14. Discuss 5 factors that have made insects the most successful members of the animal kingdom.
15. a) explain the function of the mantle in the molluscs.
b) mention 4 ways by which mollusks harm or benefit mankind.

Szl 101: Invertebrate Zoology Question Paper

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