4 Microorganisms Que

8/19/2019 4 Microorganisms Que

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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS | MethodistHigh Schoo

C!"#$idge Chec%&oi't SCIENCE (Bioog)* | +!ge 1 o, 6

CHAPTER 4 : MICROORGANISMS

• Write in dark blue or black

pen.

• You may use a soft pencil for any diagrams, graphs or

rough working.

• Do not use highlighters, glue

or correction uid.• Show all your working in the

booklet.

N!"e

-

Ro

No.

Q.1 Maya and Leela divided a ball of bread dough made with yeast into three equal sizes (byweight) and placed the dough balls in containers of the same shape and size. he height of the

dough was the same in each container at the start. ! piece was placed in"(a) ! warm window sill (b) ! cool corridor (c) ! cold fridge

hey measured in millimetres how much the dough had risen in each container in #$ minutes.

(a) %as this a fair test& %hy&

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(b) Loo' at the table of their results. raw a bar chart of their results on the given graph. ive

your graph a title and label the a*es.

+lace ,ow much the dough raised in #$ minutes (mm)%arm window sill -$

ool corridor /$

old fridge #

(b) %hich dough raised the most& ///////////////////////////////////

(c) ,ow much higher was the dough on the window sill than the one in the cold fridge after #$

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(d) %here should a ba'er leave dough to rise quic'ly&

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Q./ he photograph below shows bacteria that have developed resistance to antibiotics. hey arecalled M0! bacteria.

(a) %hen M0! bacteria reproduce2 they pass on their resistance to antibiotics to the ne*t generation.

%hat part of a cell passes on information&

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(b) M0! bacteria can cause serious infections in people

who are ill in hospital. he bacteria can live on a healthy

person3s s'in or in their lungs without causing any harm.4se this information to fill in the table below. uggest

two ways M0! bacteria can be spread from person to person. uggest how the spread of the bacteria can be prevented for each method.

(c) +eople can be vaccinated against some diseases caused by bacteria or viruses. escribe how

vaccination prevents a person getting a disease.

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Q.- he figure shows an amoeba.(a) ,ow does an ameba move& 555555555555555555555555555

(b) %hat structure contains the amoeba6s 7!& 555555555555555555

(c) %hen an ameba engulfs a particle of food a 555555555555555555

is formed.

(d) ,ow does an ameba reproduce& 555555555555555555555555555

(e) 8ingerli'e e*tensions of the ameba6s cytoplasm are

called5555555555555555555

(e) o what 9ingdom does the ameba belong& 555555555555555555555555555555

(f) he process of engulfing food particles is called 5555555555555555555555555555555555





Q.: ;acteria are micro<organisms and can be used

in food production. =t is important to find outthe best conditions for bacteria to reproduce.

%hen bacteria reproduce they form colonies.his +etri dish has si* bacterial colonies.

,ere are the results for identical +etri dishes

'ept in different conditions.

(a) ,ow do you 'now these bacteria need o*ygen to reproduce&

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(b) he colonies formed are different sizes. uggest a method for measuring size of the colony.

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(c) ,ere is a graph of the results without o*ygen.

(i) raw the results with o*ygen on the same graph.

(ii) 4se the graph to predict the number of colonies at #$>. 7umber of colonies at #$> without o*ygen ? ////////////////////////

7umber of colonies at #$> with o*ygen ? ////////////////////////

Q.: ara investigated ma'ing bread. he described what she did below.





ara repeated the e*periment with the water bath at different temperatures. ,er results are

shown below.

(a) 4se the table of results. %hat question did ara investigate&

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(b) !t each temperature ara used dough from the same mi*ture.

(i) ive one other way ara made her e*periment fair.

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(ii) %hy would using dough from a different mi*ture ma'e ara6s e*periment unfair&

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(c) ara plotted her results on the graph below. escribe the relationship between the variables onthe graph from -$> to @$>.

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(d) ara made a prediction.

%hat could she do to test her prediction&

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Q.A elect the most appropriate answer"

(a) %hat type of microbe is the smallest&

fungus bacterium virus

(b) %hich type of microbe is shown in the diagram&


(c) %hat causes tuberculosis (;) &

fungus bacterium virus(d) %hat causes athletes foot &


(e) %hat causes influenza (flu) &


(f) %hich type of cell can engulf bacteria or ma'e antibodies&%; 0; +latelets

(g) =mmunisation can involve

inBecting harmful microbes inBecting dead microbes inBecting antibodies

Q.:(b) raw line to match the bo*es to group the facts together.

;acteria

hese are the smallest type of

microbe. hey are very simple

and do not really have cells.

Most of these are formed

from thin2 threads called

hyphae.

8ungi

hey reproduce by growing

and then splitting in two.Ciruses

hese are tiny2 single cells.

he cells are different from

ours because they do not

have a nucleus.





hey are easy to see

because they have big

reproductive structures.hey ma'e dust<li'e spores

that spread in the air.

hey need to be in the cells

of other living things to

reproduce2 this is why they

cause diseases.

Q.:(b) 4se the names of the types of microbe to finish off the sentences...

....................are used to ma'e bread and beer.

8ood poisoning is usually caused by........................................ cause illnesses such as flu2 colds and measles.

.................... are used to ma'e cheese and yoghurt.

Mould on bread is caused by ....................

.................... are the smallest.

.................... are usually made up of branched threads.

.................... can on

ly reproduce inside the cells of animals or plants.

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4 Microorganisms Que