KIGALI INSTITUTE OF SCIENCE AND TECHNOLOGY
INSTITUT DES SCIENCES ET TECHNOLOGIE
Avenue de l'Armée, B.P. 3900 Kigali, Rwanda
INSTITUTE EXAMINATIONS – ACADEMIC YEAR 2012 – 2013
SUPPLEMENTARY EXAMINATION
FACULTY OF SCIENCE
APPLIED BIOLOGY
FIRST YEAR SEMESTER TWO
BIO3122 – CHORDATE ZOOLOGY
DATE:
/ /2013
TIME: 2 HOURS
MAXIMUM MARKS = 60
INSTRUCTIONS
1. This paper contains FOUR (4) questions.
2. Section A: Question number ONE is compulsory.
3. Section B: Answer any TWO (2) questions.
4. No written materials are allowed.
5. Write all your answers in the answer booklet provided.
6. Do not forget to write your Registration Number.
7. Do not write any answers on this question paper.
Section – A: Compulsory section (30 Marks)
Question 1.
a) Chordates: General characters and Classification
(15 Marks)
i) What are reptiles? Briefly outline the general characters of reptiles.
(5 Marks)
ii) By using a descriptive chart, give the family tree of chordates and one
example for each class on animals.
(10 Marks)
b) Evolution of vertebrate’s Classes & Adaptability.
(15 Marks)
i) Describe the evidences of evolution in animal kingdom.
(5 Marks)
ii) What do you understand by neutral buoyancy? Compare the neutral
buoyancy mechanism of Chondrichthyes to the one of Osteichthyes.
(5 Marks)
iii) Discuss the adaptability of the unique respiratory mechanism in aquatic
and terrestrial vertebrates.
(5 Marks)
Section –B: Choose any two questions (30 Marks)
Question 2. Protochordates
(15 Marks)
a) What do you understand by the term Tornaria?
(2 Marks)
b) Describe the reproductive system and the developmental phases in
Balanoglosus.
(10 Marks)
c) Briefly outline the zoological importance of Tornaria larva.
(3 Marks)
Question 3. Lower Vertebrates
(15 Marks)
a) What are placoid scales?
(2 Marks)
b) Describe the structure of the integumentary system in amphibians.
(10 Marks)
c) Do you find any evolutionary trend when you compare the integumentary
system of reptilians to the one of amphibians? Briefly explain.
(3 Marks)
Question 4. Higher Vertebrates
(15 Marks)
a) What do you understand by a viviparous animal?
(2 Marks)
b) Give the characteristics of an avian egg.
(3 Marks)
c) Write an essay on the urinary excretory system in mammalians. (10 Marks)
End of the Question Paper