Primary and secondary education past papers.
FORM 6-BIOLOGY3A-2018-NATIONAL EXAM-TANZANIA
THE UNITED REPUBLIC OF TANZANIA
NATIONAL EXAMINATIONS COUNCIL OF TANZANIA
ADVANCED CERTIFICATE OF SECONDARY EDUCATION
EXAMINATION
133/3A BIOLOGY 3A
(ACTUAL PRACTICAL A)
(For Both School and Private Candidates)
Time: 3:20 Hours Wednesday, 09th May 2018 a.m.
Instructions
1. This paper consists of three (3) questions.
2. Answer all questions.
3. Question one (1) carries 20 marks and the other two (2) , carry 15 marks each.
4. Except diagrams which must be drawn in pencil, all writing should be in blue or black ink.
5. Calculators, cellular phones and any unauthorised materials are not allowed in the examination room.
6. Write your Examination Number on every page of your answer booklet(s).
- You have been provided with specimen K1. Dissect the specimen K1 in a usual way to fully display the digestive system and excretory system.Pin the ileum to your right side.
(a) Draw a large , neat and well labelled diagram of your dissection.
Leave your dissection properly displayed for assessment.
(b) (i) Name the structure in the specimen K1 Which is responsible for re-absorption of water molecules from undigested food materials.
(ii) How does the structure named in 1(b)(i) adapted to its function?
(c ) Explain how the centrally location of the gizzard in specimen K1 help it to adapt its environment.
- You have been provided with solution A and B.
(a) Using the chemicals and the reagents provided, carry out the biochemical experiment toidentify the food substances contained in each solution A and B. Tabulate your results as shown in the following table.
| Food Tested | Procedure | Observation | Inference |
(b) (i) What is the role of the food substance(s) identified in solution A and B?
(ii) Briefly explain how the alimentary canal is adapted for absorption of the food substances identified in solution A and B.
- You have been provided with specimen G2,G3,G4 and G5.
(a) (i) Give two reasons to why you agree or disagree that specimen G2,G3,G4 and G5 are members of the same Kingdom.
(ii) What are the observable differences between specimens G2 and G5 at Class level?
(b)State three adaptations of specimen G4 to its life.
(c ) In what ways are specimens G4 and G5 important in the ecosystem?
(d) (i) Classify the specimen G4 to class level.
(ii) Where can we find the specimen G5?.
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