FORM TWO BIOLOGY NECTA 2021

Student's Assessment Number.........

THE UNITED REPUBLIC OF TANZANIA  NATIONAL EXAMINATIONS COUNCIL OF TANZANIA  FORM TWO NATIONAL ASSESSMENT

033 BIOLOGY

Time 2:30 Hours Year : 2021

Instructions

  1. This paper consists of sections A, B and C with a total of eleven (l 1) questions.
  2. Answer all questions in sections A and B and one (1) question from section C.
  3. Section A carries thirty (30) marks, Section B fifty (50) marks and section C carries twenty (20) marks.
  4. All writing must be in blue or black ink except drawing which must be in pencil.
  5. Cellular phones and any unauthorised materials are not allowed in the assessment room.
  6. Write your Assessment Number at the top right corner of every page.

FOR ASSESSOR'S USE ONLY

QUESTION NUMBER

SCORE

ASSESSOR'S  INITIALS

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TOTAL

CHECKER'S INITIALS

SECTION A (30 Marks)

Answer all questions in this section.

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

(i)Scurvy is a nutritional deficiency disease due to lack of

  1. vitamin C in the diet.
  2. mineral salt in the diet.
  3. vitamin B12 in the diet. 
  4. vitamin D in the diet.
Choose Answer :


(ii) Substances going in and out of the cell are controlled by

  1. cytoplasm. 
  2. cell membrane.
  3. vacuole. 
  4. tonoplast.
Choose Answer :


(iii) Which of the following step is not involved in scientific investigations?

  1. Problem identification 
  2. Asking question
  3. Formulating hypothesis 
  4. Solving questions
Choose Answer :


(iv) A parasite that causes malaria is known as

  1. Schistosoma. 
  2. Plasmodium.
  3. Mosquito. 
  4. Amoeba.
Choose Answer :


(v) The process whereby carbon dioxide passes from blood into alveoli of lungs is called

  1. osmosis. 
  2. respiration.
  3. diffusion. 
  4. breathing.
Choose Answer :


(vi) A component of the blood which is responsible for blood doting is known as

  1. albumin. 
  2. haemoglobin.
  3. leucocytes. 
  4. fibrinogen.
Choose Answer :


(vii) Why rabbit is called a primary consumer?

  1. It feeds on animals 
  2. It feeds on plants
  3. It feeds on bacteria 
  4. It feeds on fungi
Choose Answer :


(viii) If you are asked to prepare a First Aid Kit with its following will not be included?

  1. Iodine tincture
  2. Medicine to cure diseases
  3. Pair of scissors 
  4. Sterilized cotton wool
Choose Answer :


(ix) The following organisms belongs to Kingdom Fungi

  1. Mucor, Mushroom, Yeast
  2. Moss, Mucor, Yeast
  3. Euglena, Mushroom, Mucor
  4. Liverworts, Mushroom, Mucor
Choose Answer :


(x) Which of the following is a risky behaviour?

  1. Accepting favours and gifts from parents
  2. Having many sexual partners
  3. Keeping good company and avoiding immoral friends
  4. Shaking hands with HIV/AIDS infected individuals
Choose Answer :


2.For each of the items (i) — (x), write True if a statement is correct or False if a statement is not correct in the spaces provided.

(i) Sterile gauze is used for bandaging to allow enough air to get to the wound . . . . . . . . . . .

(ii) Hydrochloric acid in the stomach is a natural defense against infections  . . . . . . . . . . . 

(iii) Beard grows and breasts enlargement are secondary sexual characteristics in girls . . . . . . . . . . . 

(iv) Aorta carries deoxygenated blood from the heart to the lungs . . . . . . . . . . . 

(v) A bacterium can be distinguished from amoeba by possession of cell wall . . . . . . . . . . . 

(vi) Acids and alkalis are corrosive substances because they emit harmful radiations . . . . . . . . . . . 

(vii) Organ is a group of tissues that perform the same function . . . . . . . . . . . 

(viii) Digestion of protein starts in the mouth . . . . . . . . . . . 

(ix) Alveoli are structures that increase surface area for gaseous exchange in the lungs of human being . . . . . . . . . . . 

(x) Mosses provide shelter for small organisms . . . . . . . . . . . 

Student's Assessment Number

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3. Match the phrase in List A with responses in List B by writing the letter of the response below the corresponding item number in a table provided.

List A List B

(i) Organisms which can manufacture their own food.

(ii) Members of the same species living in the same area.

(iii) Organisms which rely on other organisms for food.

(iv) A group of interdependent organisms living in an environment.

(v) Organisms which kill other organisms and feed on them wholly or in parts.

  1. Preys
  2. Decomposers
  3. Community
  4. Predators
  5. Trophic level 
  6. Population
  7. Producers
  8. Consumers
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4. Complete each of the following statements by writing the correct answer in the spaces provided.

(i) A process of taking air into the lungs of mammals is called.............

(ii) A muscular sheet of tissue which separates the thorax from the abdomen is known as.........................

(iii) A process by which air diffuses in and out of the body across the respiratory surfaces is called.........................

(iv) The structure which protect the lungs from injury is known as . . . . . . . . . . . 

(v) The structure which is used for gaseous exchange in spider is known as . . . . . . . . .

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SECTION B (50 Marks)

Answer all questions in this section.

5. (a)State the uses of each of the following laboratory apparatuses.

  1. Mortar and pestle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
  2. Petri dish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .              
  3. Test tube rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
  4. Bunsen burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
  5. Thermometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  

(b) Differentiate the term zoology from botany.

(c) How is Biology related to the field of nutrition? Briefly explain.

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6. (a) Why is it health to be advised to eat balanced diet?

(b) If a child is suffering from kwashiorkor, which symptoms can be observed? State three.

(c) Give two natural sources of food which must be fed to the child to avoid kwashiorkor.

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7. (a) How is infection differs from disease?

(b) The following are different ways through which communicable diseases are 
transmitted. Name two diseases transmitted by each way.

  1. Sexual intercourse..........................................
  2. Contaminated food and water. .......................

(c)Why is it important to provide care and support to people living with HIV/AIDS? (Give four points.)

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8, (a) Give two examples of each of the following found in the human body.

S/N Tissue Organ System
(i)


(ii)


(b) Outline four characteristics of a cell.

(c)What will happen if chloroplast is removed from a plant cell? Briefly explain.

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9. (a)What do you understand by the term "Transport of materials" as used in Biology?

(b) What will happen to the following? Briefly explain.

(i)A plant cell is immersed in hypotonic solution.

(ii)The cardiac muscles in the heart stop working.

(c) How is leukaemia controlled? State three ways. (I)

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SECTION C (20 Marks) 
Answer one (1) question from this section.

10. Elaborate three advantages and three disadvantages of the members of Kingdom Monera.

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11. Explain the effects of poor waste disposal to the environment. Give six points.

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