1 How Plants Grow and Chapt1 of Book3 Photosyn

8/19/2019 1 How Plants Grow and Chapt1 of Book3 Photosyn

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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS | Methodist HighSchoo

C!"#$idge Chec%&oi't SCIENCE (Bioog)* | +!ge1 o, 15

BOOK 2CHAPTER : 1 How Plants GrowBOOK 3CHAPTER : 1 Photosynthesis

Q.1 An investigation was carried out to find the best conditions for photosynthesis. Four similar sized

plants of the same species were placed in a dark cupboard for 24 hours. A leaf from each plant was

removed and tested for starch. he plants were then watered and placed in the apparatus shown

below. !ach glass vessel was illuminated for 24 hours.

"a# $hen the leaves from the plants were tested for starch at the start of the investigation all gave a

yellow%brown colour with iodine. !&plain why."b# $hat conditions for photosynthesis were lacking in '

"i# vessel () ************"ii# vessel +) *******..**********

"c# $hat would be the effect of the tracing paper covering vessel ,)

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"d# After 24 hours leaves were removed from plant ( and tested for starch with iodine solution. $hat

would be the e&pected result of this test)

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Q.2 he diagram shows the apparatus used in an investigation.

An e-ual amount of a harmless blue indicator was added to each tube. he indicator changes from blue in alkaline conditions to green in acid conditions. he p of the pond water and the colour of the indicator were recorded at the start and again after / hours.

"a# he table shows some of the results.

(arbon dio&ide dissolves in water to form a weak acid."i# 0tate the colour of the pond water in tube 2 after / hours. ********..

"ii# ive a reason for your answer.

NAME:

CA!!:


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C!"#$idge Chec%&oi't SCIENCE (Bioog)* | +!ge" o, 15

"b# ow many bubbles would you e&pect to be given off per minute if the e&periment was repeated

using 4 measures of sodium hydrogen carbonate)Ans ****************************************

"c# $hat do these results suggest about the

composition of the water at the start of thee&periment)

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Q.@ ?ook at the following diagram.

"a# $hat is gas ) **********...

"b# $here does gas enter the plant) ***.

"c# $hat do plants use gas for) *****

"d# 5n which process do animals use o&ygen)

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"e# =ame process A and ,.

A ' **************. , ' **************..

"f# $hat does the arrow labelled B represent)

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Q.7 he diagram shows the stages in testing a green leaf for starch.


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C!"#$idge Chec%&oi't SCIENCE (Bioog)* | +!ge# o, 15

"d# ow would you use this apparatus to investigate the effect of increasing light intensity on the rate

of photosynthesis)Ans ****************************************

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Q.1D A student carried out an e&periment to find out if plants need light to make starch. he diagram

shows what the student did.

"a# $hy was the potted plant kept in a dark cupboard for 47 hours)

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"b# $hy did the student cover part of one of the leaves with aluminium foil)

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"c# 0tage 3 shows three areas on the leaf' A6 , and (. $rite down the colours these areas would bestained after testing for starch.

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Q.11 An investigation was setup to find out if the

concentration of carbondio&ide affected the rate

of photosynthesis. A

water plant was placed

in each of / test tubescontaining water and

different concentrationsof hydrogen carbonate.

he hydrogen carbonate

releases carbon dio&ide

into the water. Anindicator was added to

each test tube. he indicator changes from yellow to green when o&ygen is released. !ach test tubewas illuminated by a lamp placed behind a measuring cylinder full of water. he time for the

indicator to change from yellow to green was recorded and plotted on a chart.


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C!"#$idge Chec%&oi't SCIENCE (Bioog)* | +!ge$ o, 15

"a# $hat was the purpose of the measuring cylinder full of water)

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"b# $hat causes the indicator to change colour)

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he bar chart shows the results of this investigation.

"c# $hat was the effect of increasing the hydrogen carbonate concentration from D.2 to D.4E)

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"d#"i# At what concentration of hydrogen carbonate was the rate of photosynthesis highest)

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"ii# ive an e&planation for your answer.

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Q.12 he diagram shows a section through a small part of a leaf.

"a# $hich of the structures labelled on the diagram '

"i# is where most photosynthesis takes place) *******"ii# forms a waterproof layer to the leaf) *******

"iii# controls the entry of carbon dio&ide into the leaf) ****"b# $ater is needed for photosynthesis in the leaf. +escribe how

water is carried from the soil to the leaf.

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"c# >ne of the products of photosynthesis is sugar. 5n which tissueis sugar transported) *****..

Q.1 A student investigated the effect of temperature on the rate of photosynthesis in a water plant.

he results are shown in the following table.


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C!"#$idge Chec%&oi't SCIENCE (Bioog)* | +!ge% o, 15

9lot these results on the graph paper below.

"b#"i# +escribe the effect of temperature on the volume produced.

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"ii# 0uggest an e&planation for this effect.

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"c# $hat would have been the result if the e&periment had been repeated at @Do() !&plain your

answer.esult' ..................................................................................................................................................

!&planation' .........................................................................................................................................

"d# =ame two other factors which influence the rate of photosynthesis.

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Q.14 he diagram shows some of the processes which take place in a green plant.


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C!"#$idge Chec%&oi't SCIENCE (Bioog)* | +!ge& o, 15

"a# =ame A6 , and (.

A........................................... ,................................................ (................................................

"b# $hat is the function of the chlorophyll) ................................................

"c# 5n what form do plants such as potatoes store sugar) ................................................

"d# $hich process releases energy in a plant) ................................................

Q.13 he diagram shows some of the ways in which plants use carbohydrates.

"a# $hat is cellulose used for in a plant)

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"b# $hy do plants need to produce amino acids)

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"c#"i# o produce amino acids6 plants re-uire a mineral. his is labelled B on the diagram.

=ame mineral B. ***********

"ii# ow does mineral B enter the plant) **************

"d# 9lants store carbohydrates as starch rather than sugar. !&plain the reason for this.

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Q.1/ A student investigated the effect of mineral ions on the growth of plants. he diagram shows the

apparatus used.


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C!"#$idge Chec%&oi't SCIENCE (Bioog)* | +!ge 11 o, 15

"b# !&plain why the rate of photosynthesis remains the same between points , and ( on the graph.

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"c# As a result of burning fossil fuels6 atmospheric concentrations of carbon dio&ide have increased in

this country. 0uggest how this might lead to'

"i# increased food production

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"ii# decreased food production in some areas.

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Q.17 0cientists have attempted to increase food production by genetic engineering. owever concern

about these genetically modified foods has resulted in some shops withdrawing them from sale."a# 0uggest how food production could be increased if scientists succeeded in inserting'

"i# genes which control nitrogen fi&ation into cereal crops.

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"ii# genes which make plants drought resistant into cereal crops.

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"b# 0uggest a reason why there is concern about genetically modified plants.

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Q.1C (anadian pondweed is a common a-uatic plant. A student investigated the production of starch in

(anadian pondweed using lengths of leafy stem which had previously been destarched. he pieces

of plant were placed in four flasks labelled A to + and treated as shown in the table below. heflasks were kept at room temperature6 and after / hours the pieces of plant were tested for starch.

"a# ow and why was the (anadian pondweed destarched)

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"b# $hy were the water and glucose solutions enriched with carbon dio&ide)

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"c# 0uggest reasons for the results seen in each of the flasks A to +.

A' **************************************...

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+' **************************************...

Q.2D he figure shows an apparatus used in an investigationinto transpiration. he cylinders were set up and left in

the same conditions for 24 hours."a# he drop in the level of water in the cylinders is taken as

a measure of the rate of transpiration.

"i# (omplete the table.

"ii# $hich variable could account for the differences in the

results for cylinders A and ,)

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**********************"iii# 0uggest a modification you could make to ensure that all the water lost from the cylinders is taken

up by the shoots.Ans ****************************************

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"b# 0tate three environmental factors that can affect the rate of transpiration.

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Q.21 Fig. 4.1 shows a section through a leaf.


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C!"#$idge Chec%&oi't SCIENCE (Bioog)* | +!ge 1" o, 15

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"c# here are useful bacteria living in the li-uid. hey produce enzymes to help digest the insects. ,oththe bacteria and the pitcher plant absorb some of the products of digestion. ow does the number of

insects that fall into the li-uid affect the number of these useful bacteria)

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"d# 9itcher plants also have ordinary green leaves where photosynthesis takes place."i# (omplete the word e-uation for photosynthesis.

GGGGGGGGGGGGGGGG H water I glucose H GGGGGGGGGGGGGGGGGGGG

"ii# lucose is a carbohydrate. $hy are carbohydrates needed by

living things) ick the correct bo&.

Q.2 0uzi investigated how temperature affects the number of bubbles produced by waterweed in one

minute. 0he set up the e&periment as shown below.

$hen the temperature of the water was 1DJ( the waterweed did not produce bubbles.

"a# 0uzi increased the temperature of the water in the water%bath to 2DJ(. he waterweed started to

produce bubbles. 0he waited two minutes before starting to count the bubbles. !&plain why shewaited for two minutes before she started to count the bubbles.

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"b# 0uzi counted the number of bubbles produced at si& different temperatures. er results are shown

on the graph below.

"i# +raw a smooth curve on the graph.

"ii#


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"d# 0uzi;s data does not show clearly the e&act temperature at which most bubbles were produced. owcould she improve the data she collects to find this temperature)

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1 How Plants Grow and Chapt1 of Book3 Photosyn

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