FORM FOUR BIOLOGY NECTA 2012

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL

CERTIFICATE  OF SECONDARY  EDUCATION   EXAMINATION 033/1 BIOLOGY   1

TIME: 3     HOURS Thursday,   11   th    October     2012a.m.

INSTRUCTIONS

  1. This paper consists of three sections A, B and C.

  2. Answer all questions from sections A and B and one (1) question from section C.

  3. Read each question carefully before you start answering it.

  4. Except for diagrams that must be drawn in pencil, all writing should be done using a blue or black pen.

  5. Calculators are not allowed in the examination room.

  6. Cellular phones are not allowed in the examination room.

  7. Write your Examination Number on every page of your answer booklet(s).

SECTION A (20 MARKS)

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

(i)The joint in the human body which allows movement in all directions is known as

  1.  pivot
  2.  hinge
  3.  double hinge
  4.  ball
  5.  peg and socket and socket
Choose Answer :


(ii)Which of the following is a metabolic waste product?

  1.  Tears
  2.  Saliva
  3.  Mucus
  4.  Faeces
  5.  Urine
Choose Answer :


(iii) The following are examples of water-borne diseases:

  1.  malaria and bilharzia
  2.  yellow fever and typhoid
  3.  diarrhoea and malaria
  4.  cholera and plaque
  5.  cholera and typhoid
Choose Answer :


(iv)One of the distinctive features of kingdom Fungi is possession of:

  1.  plasma membrane
  2.  cytoplasm
  3.  chitin materials
  4.  cell membrane
  5.  cellulose material
Choose Answer :


(v)The regions of most active growth in plants are found mainly in the

  1.  axillary buds and flowered
  2.  stems and leaves
  3.  stems and root hairs
  4.  leaves and flowers
  5.  stem and root apices
Choose Answer :


(vi) A grasshopper ventilates its gaseous exchange surfaces by

  1.  moving the diaphragm
  2.  beating of cilia
  3.  rhythmic body movement
  4.  opening of spiracles
  5.  moving its rib cage
Choose Answer :


(vii) The taxonomic category of organisms belonging to the same class but not the same family is:

  1.  Species
  2.  Genus
  3.  Order
  4.  Phylum
  5.  Kingdom
Choose Answer :


(viii) The breakdown of glycogen into glucose in the body is due to the action of:

  1.  insulin
  2.  adrenaline
  3.  secretion
  4.  glucagon
  5.  gastric
Choose Answer :


(ix) The function of sunlight energy in the human skin is the stimulate the synthesis of

  1.  vitamin A
  2.  vitamin C
  3.  vitamin D
  4.  vitamin K
  5.  vitamin B
Choose Answer :


(x)A rise in the temperature of a human body is corrected by

  1.  construction of the skin arteries and sweating
  2.  construction of the skin arteries and shivering
  3.  dilation of the skin arteries and sweating
  4.  dilation of the skin arteries and shivering
  5.  shivering and sweating
Choose Answer :


2. Match the responses in List B with the phrases in List A by writing the letter of the correct response from List B beside the item number of List   in your answer booklet. Each choice in column B may be used once, more than once or not at all.

LIST A LIST B
  1. The layer of cells sensitive to light

  2. Lacks light intensity cells

  3. Cells sensitive to light of low intensity

  4. Cell sensitive to coloured light intensity

  5. Control the intensity of the light entering the eye

  6. Control the shape of the lens

  7. Correct short sight

  8. Reduce reflection of the light within the eye

  9. Helps to refract the light into the eye

  10. Cause refraction of the light in the eye


  1. Aqueous humour

  2. Cornea

  3. Iris

  4. Eyebrow

  5. Retina

  6. Rods

  7. Blind spot

  8. Cones

  9. Eyelash

  10. Choroids

  11. Ciliary body

  12. Diverging lens

  13. Fovea

  14. Pupil

  15. Eyelids


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SECTION B (60 Marks)

Answer all questions in this section.

All questions carry 8 marks except for question five and six which carry 6 marks each.

3. (a) Outline four features which distinguish a Biology Laboratory from other school facilities.

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(b) Outline four steps involved in using a microscope.

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4. (a) Define the following terms as used in Biology:

  1. First Aid kit

  2. Risks

  3. An accident

  4. Poisoning

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(b) Outline four procedures of giving First Aid to a person who has been stung by a bee.

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5(a) Describe the following ecological terms:

  1. Decomposers

  2. Producers

  3. Parasites

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(b) With example, briefly explain how comparative embryology supports the idea of organic evolution.

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6. (a) Outline three factors affecting transpiration.

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(b) State three significance of transpiration.

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7. (a) The laboratory technician at Mtakuja secondary school performed an experiment with the aim of proving the Mendelian experiment on single factor inheritance for a coat colour in mice. In the experiment, pure-breed (homozygous) black fur mouse (male) was mated with a pure-breed brown fur mouse (female). The gene for black fur colour was dominant over the gene for brown fur colour. Use crosses to show the possibilities of the results in the first filial generation.

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(b) Explain the meaning of the following:

  1. Gene

  2. Recessive

  3. Phenotype

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8. (a) Define the following terms:

  1. Growth

  2. Intercalary growth

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(b) Briefly explain three factors that affect growth and development in humans.

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9. The diagram in Figure 1 is the alimentary canal of a human being. Study the diagram and answer the questions that follow:

(a) Name the parts labelled A – K.

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(b)(i) Name the digestive juice which is produced in organ labelled B.

(ii) Mention the substances contained in the digestive juice named in (b) (i) above.

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10. (a) Briefly explain three importance of movement in plants and animals.

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(b) State any five functions of the skeleton.

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SECTION C (20 Marks)

Answer one (1) question from this section.

11. Describe the mechanism of breathing in human beings. Diagrams are not necessary.

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12. Elaborate the causes of drug abuse to young people and advise the Tanzanian Government on the ways of combating drug abuse in the country.

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13. Explain five factors which contribute to irresponsible sexual behavior among young people and their effect in the community.

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