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Pbiol 021: Basic Biology Ii Question Paper

Pbiol 021: Basic Biology Ii

Course:Biology

Institution: Kabarak University question papers

Exam Year:2009

KABARAK UNIVERSITY EXAMINATIONS
2008/2009 ACADEMIC YEAR
FOR THE CERTIFICATE OF PRE- UNIVERSITY BIOLOGY
COURSE CODE: PBIOL 021
COURSE TITLE: BASIC BIOLOGY II
STREAM: SEMETER TWO
DAY: THURSDAY
TIME: 2.00 – 4.00 P.M.
DATE: 26/03/2009
INSTRUCTIONS:
Answer All questions in Section A and Any TWO from Section B
SECTION A. (40 MARKS)
1. (a) Distinguish between an open and a closed circulatory system. (4 Marks)
(b) Using an athropand as an example describes the circulation of haemolyhph. (6 Marks)
2. (a) Explain the differences between pulmonary and systemic circulation.
(b) How is a double circulation advantageous over single circulation.
3. (a) Define the following terms and state their functions:
(i) Breathing
(ii) Gas transport (6 Marks)
(b) How is a gastrovascular cavity used for both digestion and nutrients distribution?
(8 Marks)
4. Discuss in details the composition of a mammalian blood. (10 Marks)
SECTION B. (30 MARKS)
5. (a) Define homeostatic (2 Marks)
(b) What do you understand by internal Environment? (3 Marks)
(c) Describe how negative feedback mechanism are used to control the level of sugar
in blood. (10 Marks)
6. (a) Distinguish between autotrophic and heterotrophic modes of nutrition. (3 Marks)
(b) Describe in details the sequence of events which occur in response to acid chyne
entering the duodenum, stating the roles of
(i) Secreting
(ii) Bicarbonate
(iii)Cholecytokin
(iv)Gallbladder
(v) Pancreatic enzymes
(vi) Bile (6 Marks)
7. For any homeostatic mechanism to work, there must be Reception, control mechanism and
effections. How does these basic principle work in thermoregulation. (15 Marks)

Pbiol 021: Basic Biology Ii Question Paper

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