Name: ……………………………………………… Class : ……Chapter 1Exercise 1Learning Area: Microorganisms and Their Effects on Living ThingsLearning Objective: Understanding the classification of microorganisms.

1. Based on their characteristics, microorganisms can be classified into five groups. Complete the diagram below.

2. Diagram below shows microorganisms.

A B C D E

Identify the group of microorganisms A, B, C , D and E

A: ………………….. B: ………………….. C: …………………………

D: …………………… E: …………………..

3. Complete the table below;

Characteristic Group of microorganisms

(a) Exist in different shapes and are generally named according to their shapes.

(b) Cannot reproduce outside living cell.

(c) Can be crystallized.

(d) They are able to make their own food by photosynthesis.

(e) Most reproduce asexually by formation of spores or sexually by conjugation.

(f) They are unicellular animals and have the structure of general animal cells.

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FIVE GROUPS OF MICROORGANISMS

Score: …./16 x 100 = …….%

Name: …………………………………………….. Class : …… Chapter 1Exercise 2Learning Area: Microorganisms and Their Effects on Living ThingsLearning Objective: Synthesising ideas about the factors that affect the growth of microorganisms.

1. The growth of microorganisms is very much affected by environmental factors such as

(a) …………………………….. (b) ……………………………… (c) ……………………………..

(d) …………………………….. (e) ………………………………

Clue :

2. Diagram 1 shows an experiment to study the effect of pH value of medium on bacterial growth.

After two days, the number of bacteria colony in each dish is counted. The results are shown in Table 1.

pH value Number of bacteria colony

2 0

7 26

13 0

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P A U T E R E M R T E G I H L T H p

M I Y U T I D H S E N T U T R I N

Petri dish PNutrient agar

+ Hydrochloric acid (pH 2)

+Bacteria culture

Petri dish QNutrient agar

+ Distilled water (pH 7)

+Bacteria culture

Petri dish RNutrient agar

+ Sodium hydroxide (pH 13)

+Bacteria culture

Diagram 1

Table 1

Score: …./12 x 100 = …….%

Based on Diagram 1 and Table 1, match Section A to Section B.

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Section A Section B

(i) Aim of the experiment

(ii) Hypothesis

(iii) Fixed variable

(iv) Manipulated variable

(v) Responding variable

(vi) Alkaline

(vii) In neutral condition

(a) pH more than 7.

(b)To study the effect of pH on the growth of bacteriagrowth of microorganisms(c)Microorganisms grow and multiply rapidly

(d) Bacteria growth is highest at pH 7

(e)Type of nutrients

(f)The growth of bacteria

(g) pH value

Name: …………………………………………….. Class : ……Chapter 1Exercise 3Learning Area: Microorganisms and Their Effects on Living ThingsLearning Objective: Applying knowledge about useful microorganisms.

1. The statements below show the uses and roles of beneficial microorganisms in daily life

A Yeast acts on carbohydrate to produce carbon dioxide that cause breads and cakes to rise.

B Dead organisms such as plants and animals undergo a process called decomposition caused by bacteria and fungi

C Penicillin, which is produced from a certain type of fungus helps us to produce antibiotics.

D Microorganisms such as bacteria and virus play an important role in the preparation of vaccines.

E Certain algae produce beta carotene to prevent cancerF Bacteria living in herbivores digestive system secrete an enzyme called cellulose which

helps to digest cellulose.G Nitrogen fixing bacteria helps to bind nitrogen from the atmosphere and convert it to

nitrate in the soil.H Yeast acts on glucose solution to produce alcohol.I Bacteria is used to oxidize alcohol in making of vinegar J Microorganisms are also used in biological control

Group the above statements into five categories

Category Statement (a) Food digestion

(i)………………………………………………………………….(b) Decaying process

(i)………………………………………………………………….

(c) Medicine

(i) ………………………………………………………………..

(ii) ………………………………………………………………..

(iii) ……………………………………………………………….

(d) Agriculture (i) ………………………………………………………………..

(ii) ………………………………………………………………..

(e) Industry

(i) ………………………………………………………………..

(ii) ………………………………………………………………..

(iii) ……………………………………………………………….

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Score: …./ 10 x 100 = …….%

Name: ………………………………………………… Class : ……Chapter 1Exercise 4Learning Area: Microorganisms and Their Effects on Living ThingsLearning Objective: Analysing the harmful effects of microorganisms.

1. Identify the diseases caused by microorganisms from the cross word puzzle below.

M O T I N E A S H C E N D O L

C E C A T I D M C H O L E R A

P T A A I H U A R T U N N O T

O I N S I A B E T E S E G N R

L B M A L A R I A L A M U A O

I E R L J E C A N C E R E L S

O A E R I C S G K R M P F D A

M S V R S T G W O L M K E I I

Y A M R I N G W O R M I V N D

E T K M L D A K P O A J E H S

L G A A T R I C A H R E R O R

I B M U M P S Y U R I M R N O

T D Y S B N T S Y P H I L I S

I H D Y S E N T E R Y J I O I

S L A H E P A T I T I S B S T

Diseases caused by ;

i) Viruses : ……………………………………………………………… (6 diseases)

ii) Bacteria : ………………………………………………………………… (2 diseases)

iii) Fungi :……………………………………………………………………. (2 diseases)

iv) Protozoa: ………………………………………………………………… (2 diseases)

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Score: …./ 12 x 100 = …….%

Name: ……………………………………………… Class : ……Chapter 1Exercise 5Learning Area: Microorganisms and Their Effects on Living ThingsLearning Objective: Analysing ways to prevent infection caused by microorganisms.

1. Study the terms below.

Complete the following statements with the correct terms.

Statement Term(a) Process of injecting vaccine

(b) A process to kill microorganisms

(c) Chemicals used to kill or inhibit the growth of microorganisms on the skin

(d) Produced by white blood cells to fight against the invading antigens

(e) Harmful microorganisms causing diseases.

(f) Substance containing animal antibodies

(g) Pathogen or microbes in blood

(h) An agent that carries diseases

(i) Substance containing weakened pathogen

(j) The ability of the body to resist pathogens infections

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Vector Immunity Sterilization Vaccine

Vaccination Antigen Antiseptics Antibody

Serum Pathogen

Score: …./ 21 x 100 = …….%

2. The following are steps how to prepare the serum from a horse. (a) The body of the horse produces antibodies for a particular disease.

(b) The horse blood is centrifuged to obtain the serum

(c) The horse is injected with microorganism of a particular disease.

(d) The horse’s blood is extracted.

Rearrange the steps above to show how to prepare the serum from a horse. (i) ………………………………………………………………………

(ii) ………………………………………………………………………

(iii) ………………………………………………………………………. (iv) ……………………………………………………………………….

3. The diagram below shows the types of immunity.

Name A : …………………………………. E : ………………………………… B: …………………………………. F : …………………………………

C: ………………………………….. G: …………………………………

D: ………………………………….

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Immunity

Active A

B C

Example: E Example:Vaccine

Natural D

Example: F Example: G

Name: ……………………………………………… Class : ……Chapter 1Exercise 6Learning Area: Microorganisms and Their Effects on Living ThingsLearning Objective: Understanding how diseases caused by microorganisms are treated.

Fill in the blanks with the correct answers. Choose the word from the box given.

1. During surgery, the tissue or organ that is damaged or infected by diseases is

……………………or…………………………………

2. Antibiotics given by the doctor must be consumed based on the allocated time and quantity. This is

to ensure that all the pathogens causing the diseases are ……………. by the antibiotic. Otherwise,

the surviving ………………….. will develop resistance towards the antibiotic. Hence, the same

……………………….. will not be able to cure the same diseases in the future.

3. Example of diseases that can be cured with antibiotics include …………….and ………………… Antibiotic

cannot be used to cure diseases that are caused by …………………….

4. …………………. (x-rays or gamma rays) is used to kill ……………………….. cells in tumour.

5. In …………………. , microorganisms are used in genetic engineering such as the production of

……………………….. for diabetics.

6. To conserve the environment, ……………………. is used in the treatment of sewage.

7. Drugs are harmful to the body if taken in excess amounts. Over consumption of aspirin in the long term

can damage the …………………….. and ………………………….

8. Antibiotics such as …………………….. can only be taken when prescribed and supervised by

………………………….. .

9. Use of …………………………… is a common type of traditional treatment.

10. Two examples of diseases that are easily treated with antiserum are ……………………….. and

……………………………….

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Penicillin cancer biotechnology antibiotic

killed liver replaced herbs

virus pathogens doctors tuberculosis

kidneys rabies gonorrhea removed

insulin tetanus radiotherapy bacteria

Score: …./ 20 x 100 = …….%