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Basic Zoology I Question Paper

Basic Zoology I

Course:Bachelor Of Science

Institution: Moi University question papers

Exam Year:2002

UNIVERSITY EXAMINATIONS 2001/2002

FIRST YEAR FIRST SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE

BASIC ZOOLOGY 1

INSTRUCTIONS

Answer any 10 questions and illustrate your answers with diagrams whenever possible.

1. a) Define the following terms; scolex, microtriches, proglottids and strobila.( 4 mks)

b) Give three ways in which nemertines differ from platyhelminths.(3 mks)

2. Describe three ways to avoid fouling that evolved in gastropods.(7 mks)

3. Briefly discuss the factors that have led to the success of arthropods.(7 mks)

4. a) Explain why a protozoan maybe very complex even though it is composed of only one cell.(4mks)

b) Explain the difference between mictic and amictic eggs of rotifers and tell the adaptive value of each.(3mks)

5. Briefly describe asconoid, syconoid body types in sponges.(7mks)

6. Describe the major characteristic features of the class insecta.(7mks)

7. Briefly define the following terms.

a) Fertilization

b) Zygote

c) Cleavage

d) Blastula

e) Glastrulation

f) Tripoloblastic

g) Pseudocoelomate.(7mks)

8. a) Define the term gastrulation (1mk)

b) Name the three embryonic germ layers and give an example of one organ system that will develop from each.(6 mks)

9. Name the five levels of organization in the animal complexity. Give an explanation why the metazoan cell is not the equivalent of a protozoan cell.(7 mks each)

10. Discuss the following hypotheses.

a) Colonial hypothesis

b) Plasmodial hypothesis.(7 mks)

11. Name any three hallmarks shared by all chordates, and explain the function of each.(7 mks)

12. Briefly discuss the two kinds of cleavage recognized among different groups of animals.

Basic Zoology I Question Paper

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