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MRSM BIOLOGY PAPER 3 2011

Question 2 :

Plants require carbon dioxide and water to synthesize organic compounds in the presenceof light energy in a process called photosynthesis. The rate of photosynthesis is affected

 by factors such as concentration of carbon dioxide, light intensity and temperature.

Based on the above information, plan a lab experiment to study the effect of carbon 

dioxide concentration on te rate o! "otos#ntesis in an aquatic plant

Ob$ecti%e To study..

Prob&e'

State'ent

!hat is the effect of ." #

(ariab&es )

Mani"u&ated

Res"ondin*

+onstant

.

.

.

#

,#"otesis $ %ow manipulated variable affects responding variable"&!hen concentration of carbon dioxide increases, the rate of photosynthesis increases.

#

Materia&s and

A""aratus

#

Procedure

-1)

Settin* u"

a""aratus and

'ateria&s

-2),o. to and&e

+(

-3)

,o. to and&e

M(

-/)

,o. to and&e

R(

-)

Precautionar#

ste"s

Re"eat the experiment to get a%era*e resu&t

#

Presentation

o! data

'

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MRSM BIOLOGY PAPER 3 200

Question 2 :(emna sp. is a small floating plant which lives in fresh water. )t reproduces sexually. The

growth of (emna depends on abiotic factors such as light intensity, temperature, water,

 p% and carbon dioxide concentration.

Based on the above information, plan a lab experiment to investigate te e!!ect o!can*e in ", %a&ue on te "o"u&ation *ro.t rate o! Le'na "&ant

Ob$ecti%e To investigate..

Prob&e'

State'ent

!hat is the effect of . #

(ariab&es M(

  R(

  +(

.

.

.

,#"otesis $ %ow manipulated variable affects responding variable"&!hen the p% value is *, the population growth rate of (emna

is the highest

#

Materia&s

A""aratus

#

Procedure

-1)

Settin* u"

a""aratus and

'ateria&s-2)

,o. to and&e

+(

-3)

,o. to and&e

M(

-/)

,o. to and&e

R(

-)

Precautionar#ste"s

+ount and record the number of (emna plants after one wee.+alculate the growth rate using a formula.

-epeat the experiment to get average result

#

Presentation

o! data

'

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SPM BIOLOGY PAPER 3 2010

Question 2

rganisms in an environment compete with each other for the same basic needs in theirsurvival. +ompetition between individuals of different species is called inters"eci!ic 

co'"etition and of the same species is called intras"eci!ic co'"etition. The effect of

the competition is shown in their growth such as the ei*t4 si5e and dr# 'assBased on the above information, plan a laboratory experiment to study the effect of

interspecific competition between maize and paddy plants on their growth.

Ob$ecti%e To investigate..

Prob&e'

State'ent

!hat is the effect of interspecific competition #

(ariab&es M(

  R(

  +(

..

.

#

,#"otesis $ %ow manipulated variable affects responding variable"&!hen there is interspecific competition between maize and paddy, the dry mass of the paddy plant decreases.

#

Materia&s #

A""aratus

Procedure

-1)

Settin* u"

a""aratus and'ateria&s

-2)

,o. to and&e

+(

-3)

,o. to and&e

M(

-/)

,o. to and&e

R(

-)Precautionar#

ste"s

#

Presentation

o! data

'

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B)(/) P0P1- #

2igestion of starch begins in the mouth. 3alivary amylase breas down starch to maltose.

4or a healthy person, the body temperature at #* + is the best temperature for enzymereaction.

Ob$ecti%e To investigate the effect of temp. on the rate of amylase reaction.Prob&e'

State'ent

!hat is the effect of temp. on the rate of amylase reaction " #

(ariab&es M(

  R(

  +(

Temp. of substrate

-ate of amylase reaction5Time for conversion of starch to sugar 6ol. of starch and saliva5p% of medium

#

,#"otesis 6 ,o. 'ani"u&ated %ariab&e a!!ects res"ondin* %ariab&e78

The rate of amylase reaction with starch is highest at the

optimum temperature.

The optimum temperature for the rate of amylase reaction is

#*o

+

#

Materia&s

A""aratus

3aliva, 78 starch solution ,iodine, ice , water,distilled water #

Test tubes, beaer, Bunsen burner, thermometer,stop watch,measuring cylinder, glass rod , dropper, white cavity tile

Procedure

-1)

Settin* u"

a""aratus and

'ateria&s

-2),o. to and&e

+(

-3)

,o. to and&e

M(

-/)

,o. to and&e

R(

-)

Precautionar#

ste"s

7. -inse the mouth and collect saliva. $97,9&

'. 2ilute the saliva with distilled water.$97&

#. 0dd ml of 78 starch with 7ml of starch solution.$97,9'&;. Place the mixture in water bath at 7

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