FORM FOUR BIOLOGY NECTA 2021

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL OF TANZANIA 
CERTIFICATE OF SECONDARY EDUCATION EXAMINATION

033/1 BIOLOGY 1

(For Both School and Private Candidates)

Time: 3 Hours Year: 2021

Instructions

  1. This paper consists of sections A, B and C with a total of fifteen (15) questions.
  2. Answer all the questions in sections A and B and two (2) questions from section C of which question number 13 is compulsory.
  3. Section A carries fifteen (15) marks, section B sixty (60) marks and section C carries twenty five (25) marks.
  4. All writing should be in blue or black pen, except for diagrams that must be drawn in pencil.
  5. 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).

SECTION A (15 Marks)

Answer all questions in this section.

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

(i) Which respiratory surface is used for gaseous exchange in tadpoles?

  1. Spiracles
  2. Gills
  3. Lungs 
  4. Skin
  5. Book lung
Choose Answer :


(ii) Which of the following apparatuses are used for magnifying specimens?

  1. Hand lens and petri dish 
  2. Hand lens and watch glass
  3. Microscope and watch glass
  4. Microscope and hand lens
  5. Measuring cylinder and beaker
Choose Answer :


(iii) Which safety precaution should be taken when administering First Aid to a wounded person?

  1. Washing hands with soap 
  2. Wearing protective gloves
  3. Calling the ambulance for pick-up 
  4. Washing the wound with soap
  5. Drying the wound with clean cloth
Choose Answer :


(iv) The following are the characteristics of prokaryotes except

  1. have nuclear materials. 
  2. they are microscopic.
  3. have nuclear membrane. 
  4. have cell wall.
  5. they are single celled organisms.
Choose Answer :


(v) Which of the following are the end products of digestion when lipids are digested completely?

  1. Glucose and fructose 
  2. Fatty acids and glucose
  3. Amino acids and fructose 
  4. Glucose and glycerol
  5. Fatty acids and glycerol
Choose Answer :


(vi) What happens when a person moves from a bright lighted to a dim lighted room?

  1. Pupil becomes large 
  2. Pupil becomes small
  3. Circular muscles contract
  4. Radial muscles relax
  5. Radial and circular muscles relax
Choose Answer :


(vii) Which of the following set of conditions is necessary for seed germination?

  1. Temperature, soil and water
  2. Water and carbon dioxide
  3. Water, temperature and oxygen
  4. Water, temperature and food
  5. Soil, oxygen and water
Choose Answer :


(viii) The laboratory technician investigated the faeces of a patient and found organisms with flattened segmented bodies. What is the name of the organisms?

  1. Tapeworms 
  2. Roundworms
  3. Liver flukes 
  4. Filarial worms
  5. Planaria
Choose Answer :


(ix)The following balanced habitat contains grasses, wildebeests, lions and bacteria. What would happen if lions were removed?

  1. The number of bacteria would remain the same.
  2. The number of wildebeest would decrease.
  3. The amount of grasses would decrease.
  4. The amount of grasses would increase.
  5. The number of wildebeests would increase.
Choose Answer :


(x)What will happen if phloem tissue is destroyed in green plants?

  1. Absorption of water in the plant body will stop.
  2. Absorption of mineral salts will stop.
  3. Transport of water and manufactured food will stop.
  4. Transport of manufactured food will stop.
  5. Transport of oxygen in the plant body will stop.
Choose Answer :


2. Match the descriptions of the parts of heart in List A with their corresponding terminologies in List B by writing the letter of the correct response beside the item number in the answer booklet provided.

List A

List B

(i) A chamber of the heart which has relatively thick walls.

(ii) A valve that prevents the backflow of blood from the right ventricle to the right auricle.

(iii) A valve that prevents the backflow of blood from the pulmonary artery to the right ventricle.

(iv) A tissue that separates left and right chambers of the heart.

(v) A chamber of the heart which has relatively thin walls.

A.  Auricle

B. Aorta
C. Bicuspid

D. Myocardium

E. Semilunar

F Septum

G Tricuspid

H. Ventricle

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SECTION B (60 Marks) 
Answer all questions in this section.

 3. In a car accident many people were injured and felt pains all over their bodies. The victims were given First Aid before taken to hospital. What was the aim of administering first aid to the accident victims? Give four points.

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 4.Puberty is the transition period from childhood to adulthood where the body undergoes different psychological and physiological changes. Give six physiological changes which occur in boys during puberty.

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 5.In animals, not every mating leads to fertilization. Give four factors in males which account for this problem.

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 6.You have visited a school farm and observed that all maize plants have small yellowish leaves and show stunted growth.

  1. Name four elements which are absent in the soil of the school farm.
  2. What functions do the named elements play in crop production? Give one function for each element.
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7. Differentiate anaerobic from aerobic respiration. Tabulate your answer as shown in following table.


Feature

Aerobic Respiration

Anaerobic Respiration


Site in the cell




Substrates involved




End products




Amount of energy per molecule of glucose



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8. How is the axial skeleton adapted to perform its function? Give three points.

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9. How does the skin of a man regulate internal body temperature when the external environment is overheated? Briefly explain by giving three ways.

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10. Briefly explain the importance of the four excretory products of plants.

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11. Albinism is the hereditary condition where the body lacks melanin pigment in hair, skin and eyes. Briefly explain two problems faced by albinos in their environment and how to overcome those problems.

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12. Giving one example in each case, briefly explain how the following provide evidence for evolution.

  1. Homologous structures
  2. Cell biology
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SECTION C (25 Marks)

Answer two (2) questions from this section. Question number 13 is a compulsory.

13. Irresponsible sexual behaviour among youths poses a problem to the Tanzanian community. Justify this statement by elaborating six effects. (15 marks)

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14. When the bell was rang after break time, students entered into their classrooms. Explain the role of each part of the ear involved in the hearing mechanism which made the students respond by entering the classrooms after the bell was rang. (10 marks)

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15. Form One students in a certain secondary school were interested to know why it is necessary to study Biology. Assume you are a Biology teacher; educate these students on the importance of studying Biology by giving four points. (10 marks)

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