THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL

033/1              BIOLOGY 1

(For Both School and Private Candidates)

Time: 3 Hours                          Wednesday, 01^stNovember 2017 a.m.

Instructions

1. This paper consists of sections A, B and C with a total of thirteen (13) questions.
2. Answer all questions in sections A and B and one (1) question from section C.
3. Except for diagrams that must be drawn in pencil, all writing should be in blue or black ink.
4. Calculators, cellular phones and any unauthorised materials are not allowed in the examination room.
5. Write your Examination Number on every page of your answer booklet(s).

SECTION A (20 Marks) 

Answer all questions in this section.

1. For each of the items (i) - (x), choose the correct answer among the given alternatives and write its letter beside the item number in the answer booklet provided.

(i)  Goitre is a deficiency disease caused by lack of which element in the diet?

1.  Carbohydrate 
2. Iodine 
3. Vitamin E 
4. Vitamin C
5.  Protein.

(ii) Tongue rollers in genetics is an example of

1.  gametogenesis 
2. continuous variation 
3. swallowing 
4. lubricating food 
5. discontinuous variation.

(iii)Which food substance is investigated in the biuret test procedur?

1.  Carbohydrate 
2. Lipids 
3. Protein 
4. Starch 
5. Reducing sugar.

(iv) The product of anaerobic respiration process in animals is

1.  lactic acid   
2. carbondioxide  
3. alcohol
4. water  
5.  oxygen.

(v)  A phylum consisting of species with jointed appendages and exoskeleton is known as

1.  Chordata 
2. Anelida 
3. Arthropoda
4. Platyhelminthesis 
5. Nematoda.

(vi) Which part of the flower receives pollen grain during pollination?

1.  Petal 
2. Stigma 
3. Stamen 
4. Style 
5. Ovary.

(vii) A rapid growth in plants is mainly taking place in

1. leaves 
2. cambium
3. roots
4. shoots and root tips 
5. stem. 

(viii) Which of the following is NOT a component of First Aid Kit?

1. Razor blade 
2. Panadol 
3. Bandage 
4. Soap 
5. Microscope. 

(ix) Which disease spread rapidly as a result of poor waste disposal?

1. Anemia
2. AIDS
3. Cholera
4. Leukemia
5. Small pox.

(x) A voluntary muscle that is capable of relaxing continuously and do not fatigue easily is known as

1.  skeletal muscle
2. biceps
3. triceps
4. cardiac muscle
5. smooth muscle. 

2.  Match the phrases in List A with the responses in ListB by writing the letter of the correct response from List B beside the item number of List A in your answer booklet provided.

 SECTION B (60 Marks)

Answer all questions in this section.

All questions carry 8 marks except question eight (8) and nine (9) which carry 6 marks each.

 3.  (a) Why schools should have a Biology laboratory? Give a reason.

      (b)  State six laboratory rules.

4.  (a) State two principles of waste disposal.

(b)  Suggest three proper ways of waste disposal in the community.

5. (a) (i) What do you understand by the term respiration?

    (ii) Name the two types of respiration.

(b) Explain how gaseous exchange occurs across the aveolus.

6.  (a) Differentiate complete dominance from incomplete dominance.

(b) In a laboratory experiment, tall pea plants were crossed wiht dwarf pea plants. F1 plants    were then selfed to produce F2 generation.

(i) Using appropriate symbols, work out a genetic cross for F 1 generation.   

(ii) Give the phenotypic and genotypic ratio of F1 generation.

7.(a) Explain the process of fertilization in flowering plants.

(b) Briefly explain how you would identify an insect pollinated flower.

8. (a) Name three type of muscles found in mammals.

  (b) Briefly explain how muscles are adapted to their role. Give three points.

9. (a) List any two types of blood cells.

(b) Give two differences between arteries and vein. 

10. (a) With examples, state the meaning of “abiotic” and “biotic” factors of the environment.

(b) (i) Differentiate the terms “food chain” from a “trophic level”.

(ii) Construct a food chain by using organisms named in the following list: Grass, Bacteria, Lions and Zebra.

SECTION C (20 Marks) 

Answer one (1) question from this section.

11. Describe the types of macronutrients needed in human body. In each type identify the source and function of food substances in human body.

12. With the aid of illustrations, discuss the stages of mitosis.

13. With the aid of a well labelled diagram, describe the structure of bacteria and give three advantages and disadvantages of bacteria in daily life.