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Pharmacognosy Question Paper

Pharmacognosy

Course:Bachelor Of Science In Medical Laboratory Science

Institution: Kenyatta University question papers

Exam Year:2009

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2009/2010
FIRST SEMESTER EXAMINATIONS FOR THE DEGREE OF BACHELOR OF
SCIENCE IN MEDICAL LABORATORY SCIENCE

SBC 428: PHARMACOGNOSY

DATE: Thursday, 24th December, 2009

TIME: 2.00 p.m. – 4.00 pm.
------------------------------------------------------------------------------------------------------------
SECTION A ANSWER ALL QUESTIONS 10 MARKS EACH

1
a)
Define Pharmacognosy and outline its scope including closely
associated disciplines

(3 marks)

b)
Outline the importance of natural drug substances in the modern system
of
medicine
(4
marks)

c)
List six active ingredients that may be found in medicinal plants

(3 marks)
2
a)
Outline the main natural organic sources of drugs giving an example in
each case

(3 marks)

b)
Give the inorganic sources of drugs and outline two specific examples in
each case and their medicinal use

(3 marks)

c)
Name four drugs that are synthetically prepared
(4 marks)

3
a)
Define the term antibiotics

(2 marks)

b)
Classify the various types of antibiotics base on the ingredient chemical
structure and give an example of a drug for each clan
(8 marks)
SECTION B ANSWER ANY TWO QUESTIONS (20 MARKS EACH)

4
Discuss the biological source distribution active ingredients and medicainal use of
the following
a)
Coffee
b)
Opium
c)
Yohimbine
d) Quinghaosu
e) Muarubaine
(4
marks
each)

5
a)
Define the word alkaloids and outline their general characteristics

(4 marks)
b)
Outline four different chemical tests for the detection of alkaloids

(4 marks)
c)
Give four different criteria which may be used in the classification of
alkaloids

(4 marks)

d)
Identify the skeletal structure of alkaloids found in medicinal plants and
give one example of each structure

(8 marks)

Discuss pesticides of natural origin under the following headings
Insecticides
(5
marks)
Rodenticides
(2
marks)
Molluscicides
(2
marks)

Fill in the table below
Name of plant
Part of plant
Active principle
Medicinal use
Rauwolfia

Cinchona

Digitalis

Senna

Ginger

Physostigma

Aloe

Vinca

Datura

Sandal
wood

Prunus
Africana

Tea

(11 marks)

Pharmacognosy Question Paper

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