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Zool 101: Lower Inverterbrates Question Paper

Zool 101: Lower Inverterbrates

Course:Bachelor Of Education Science

Institution: Egerton University question papers

Exam Year:2012

SECTION A: ANSWER ALL QUESTIONS

1. Explain the following terms: (10 Marks)
a. Triploblastic
b. Metagenesis
c. Simultaneous hermaphrodites
d. Sarcodina
e. Chromatophores
2. Give two distinguishing features of Phytomastigophorea and Zoomastigophorea. (4 Marks)
3.(a) With an aid of a labelled diagram, briefly describe the structure of Paramecium. (5 Marks)
(b) Outline the functions of the trichocysts. (2 Marks)
4. Explain briefly the structural differences between the parazoans and the
choanoflagellate ancestors. (3 Marks)
5. Differentiate between the Skeleton of Calcarea and that of Hexactinellida. (3 Marks)
6. List the importance morphological features of higher invertebrates that were first
observed in the plytyhelminthes. (4 Marks)
7. Outline the differences between paraphyletic and polyphyletic. (2 Marks)
8. How do tapeworms feed? Give a reason for your answer. (2 Marks)
9. Giving examples, describe the structure and levels of organization in protozoans. (5 Marks)

SECTION B: ANSWER TWO QUESTIONS ONLY

10. Sporozoans are possibly the most widely occurring parasites in living organisms.
Discuss this statement using examples. (15 Marks)
11. Discuss the economic and ecological importance of Cnidarians. (15 Marks)
12. Discuss the anatomical structure of Nemerteans. (15 Marks)

Zool 101: Lower Inverterbrates Question Paper

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