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Szl 201 Question Paper

Szl 201

Course:Bachelor Of Science

Institution: Kenyatta University question papers

Exam Year:2010

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2009/2010
INSITUTIONAL SCHOOL BASED PROGRAMME (IBP)
EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE

SZL 201: INVERTEBRATE ZOOLOGY

DATE:
Friday 30th April 2010

TIME: 4.30p.m – 6.30p.m

INSTRUCTIONS:
Answer ALL questions in section A and any other ONE question in section B.
Within a section in section all questions carry equal marks. Illustrate your answers
with diagrams and give examples wherever appropriate.

Section A: (40 marks) Answer ALL questions

1.
Differentiate between a trichocyst and a nematocyst.

2.
Describe the stages involved during formation of a pseudocoelom from zygote.

3.
Explain briefly sexual reproduction in protozoans

4.
a)
Name the two types of holoblastic cleavage styles found in invertebrates

b)
Draw an illustration to show the 8-cell stage of any one of the two.

5.
Explain the relationship between choanoflagellates and choanocytes.

6.
Outline the classification system based on the studies on ribosomal RNA and
protein
synthesis.

7.
Describe how annelids burrow into the ground.

8.
a)
State the role played by clitellum in oligochaetes

b)
Outline three ways in which oligochaetes modify the environment where
they
are
found

Section B: (30 marks) Answer ONE question

9.
Discuss the importance of invertebrates in human life.

10.
Write an essay on any named simple metazoan invertebrate that bridges the gap

between protozoan and true metazoa.

11.
“Marine invertebrates float on the water surface or live at the bottom” Discuss
this
statement.