FORM TWO BIOLOGY NECTA 2020

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL OF TANZANIA

FORM TWO NATIONAL ASSESSMENT

033 BIOLOGY

Time 2:30 Hours Year: 2020

Instructions

l . This paper consists of sections A, B and C with a total of eleven (11) 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.Alt 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.

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)Which condition occurs when a plant cell is immersed in highly concentrated solution?

  1. Turgidity 
  2. Crenation
  3. Plasmolysis
  4. Haemolysis
Choose Answer :


(ii)The process by which green plants and other organisms use sunlight energy to manufacture their own food is known as 

  1. respiration 
  2. digestion
  3. photosynthesis
  4. nutrition
Choose Answer :


(iii)Which storage organ does sugarcane stores its food after photosynthesis'?

  1. Stem 
  2. Root tuber
  3. Tap root
  4. Rhizome
Choose Answer :


(iv)The following are the end products of anaerobic respiration in plants except

  1. energy. 
  2. lactic acid. 
  3. carbon dioxide. 
  4. alcohol.
Choose Answer :


(v)Which organisms belongs to Kingdom Plantae?

  1. Fern and amoeba 
  2. Moss and mucor
  3. Liverwort and yeast
  4. Fern and moss
Choose Answer :


(vi)Bacteria and fungi are ecologically referred as

  1. producers. 
  2. decomposers. 
  3. parasites. 
  4. predators.
Choose Answer :


(vii)Unexpected event which can cause injury and sometimes death is called

  1. accident.
  2. emergency.
  3. outbreak.
  4. disaster.
Choose Answer :


(viii)The liquid induced into the body of an organism so as to increase antibody production is known as

  1. tissue fluid.
  2. lymph.
  3. vaccine. 
  4. plasma.
Choose Answer :


(ix)People with talking behaviour while eating are considered to have 

  1. bad manner. 
  2. table manner.
  3. talkative manner.
  4. chatty manner.
Choose Answer :


(x)Arteries have thick muscular walls because they transport blood 

  1. at low pressure. 
  2. at high pressure.
  3. towards the heart.
  4. away from the heart.
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) All cells contain chloroplasts . . . . . . . . . . . . . .

(ii)Cholera is transmitted through contaminated food . . . . . . . . . . . . . . 

(iii)During inhalation, diaphragm relaxes and becomes dome-shaped . . . . . . . . . . . . . . 

(iv)Vena cava transports deoxygenated blood from the body to the heart . . . . . . . . . . . . . . 

(v)Sharing of towels can spread STI's . . . . . . . . . . . . . .

(vi)Zoologist is a person who studies plants . . . . . . . . . . . . . . 

(vii)Bile is a greenish yellow liquid produced by gall bladder . . . . . . . . . . . . . . 

(viii)Producers are organisms that make their own food . . . . . . . . . . . . . . 

(ix)All members of Kingdom Fungi are autotrophs . . . . . . . . . . . . . . 

(x)Sitting upright when eating or drinking prevents choking . . . . . . . . . . . . . . 

View Ans



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

List A List B

(i) Ability of the body to resist infection and disease.

(ii) The invasion of pathogens into the body of living organism.

(iii) A process of inducing antigens into a healthy person.

(iv) A condition that affects the health of the body and is characterized by certain symptom.

(v) Agents which spread pathogens in the community.

  1. Disease
  2. Vaccination
  3. Infections
  4. Vectors
  5. Immunity
  6. Endemic
  7. Antibodies
  8. Pandemic
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4. Complete each of the following statements by writing the correct answer in the spaces provided.

(i)The sticky fluid in the nose that helps to trap dust is known as . . . . . . . . . . . . . . 

(ii)The muscles that are found between the ribs are called . . . . . . . . . . . . . . 

(iii)The process of taking in air into the lungs is called . . . . . . . . . . . . . . 

(iv)The breakdown of food in the absence of oxygen to release energy is known

as . . . . . . . . . . . . . . 

(v)A structure that closes the opening of the trachea to prevent food from entering it during swallowing is known as . . . . . . . . . . . . . . 

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SECTION B (50 Marks)

Answer all questions in this section.

5. (a) Differentiate eukaryotic from prokaryotic cells.

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(b)Choose any two parts found in an animal cell and briefly explain one function for each,

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(c)Why most of the plant cells have cellulose cell wall? Briefly explain.

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6. (a) State three laboratory rules.

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(b) Figure 1 represents an instrument used to magnify too small objects or organisms in a Biology laboratory. Study it carefully and then answer the questions that follow:

image

Figure 1

(i) Name the parts labeled A - F

(ii) State the function of the part labeled E.

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7. (a)Why is food chain considered to be a simple transfer of energy? Briefly explain.

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(b)Construct four possible food chains by using the following organisms: Grasses, Lion, Bacteria, Zebra, Hyena and Giraffe.

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(c) Explain the role played by the following organisms in the food chains you have constructed in 7(b) above.

(i)Bacteria.

(ii)Grasses.

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8. 2 cm3 of a food sample solution Q changed to purple colouration when 1cm3 of sodium hydroxide followed by 2-3 drops of copper Il sulphate solution were added to it.

(a)Identity a food substance present in the solution Q.

(b) State two functions of the food substance present in the solution Q.

(c) Give five natural sources of food substance contained in the solution Q

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9.(a) Stale the use of the following components of First Aid kit. 

(i)Cotton wool

(ii)New razor blade

(iii)Soap

(iv)Iodine tincture

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(b) Give four importance of providing First Aid to a person who has been bitten by a snake.

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SECTION C (20 Marks)

Answer one ( l) question from this section.

10. Describe two merits and two demerits or each of the artificial and the natural systems of classification.

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11. Explain the importance or transport of materials in animals. Give six points.


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2. (a)Match each item in List A with a correct response in List B by writing the letter of the correct response below the corresponding item number in the table provided.

List A List B

(i) An element with atomic number

(ii) The type of bonding which occurs between non metals.

(iii) Elements in the Periodic Table found in groups IV to VII.

(iv) Vertical columns of the Periodic Table.

(v) Elements which react vigorously with water
  1. Groups
  2. Group 1
  3. Ionic bonding
  4. Metals
  5. Noble gas
  6. Non-metals
  7. Covalent bonding
  8. Halogen
View Ans


(b) Answer the given questions by writing the correct answer in the blank spaces provided.

(i) In which stage is the hypothesis tested during scientific investigation? . . . . . . . . . . . . . . . . .

(ii) On which factor does the physical state of a molecule depend?  . . . . . . . . . . . . . . . . . 

(iii) Which properties depend on the proportions of mixing substances in a mixture? . . . . . . . . . . . . . . . . . 

(iv) What are the building blocks of matter?  . . . . . . . . . . . . . . . . . 

(v) Which particles are transferred during chemical reactions? . . . . . . . . . . . . . . . . .
View Ans



SECTION B (80 Marks)

Answer all questions in this section.

3. (a) Why candles are not suitable for heating in the laboratory? Give two reasons.

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(b) Differentiate luminous from non-luminous flame by giving five points.

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4. (a) State four main ideas of the Dalton's atomic theory of matter.

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(b)Classify each of the following elements into their respective groups and periods.

SIN

Element

Group

Period

(i) 

Calcium

 

 

(ii) 

Hydrogen

 

 

(iii) 

Chlorine

 

 

(iv) 

Boron

 

 

(v) 

Aluminium

 

 

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5. (a)With an example for each, give two fields in which the scientific procedure is applied.

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(b) Categorize the three factors (variables) which affect the problem being investigated during scientific investigation.

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6, (a) Briefly explain why:

(i) the use of charcoal is harmful to the environment.

(ii)charcoal is still being used by majority of Tanzanians for domestic purposes.

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(b) A mass of 20.0 g of petrol was burnt in air. The heat produced was used to heat 2.5 litres of water. Given that the heat value of petrol is 43,640 kJ/kg, by how much the temperature of water could have changed? (The specific heat capacity of water = 4.18 Id kg-1 K-1, Density of water = 1000 kg/m3).

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