CONTROL TEST 2

GRADE 10 LIFE SCIENCES
Photosynthesis and Respiration
Fotosintese en Respirasie
Total / Totaal: 60 marks Time / Tyd: 1 h
INSTRUCTIONS AND INFORMATION
Read the following instructions carefully before answering the questions.
1. Answer ALL the questions / Beantwoord al die vrae
2. Number the answers correctly / Nommer al die vrae korrek
3. All drawings should be done in pencil and labeled in blue or
black ink. / Alle sketse moet in potlood wees en die byskrifte in
blou of swart ink.
4. The diagrams in this question paper may NOT necessarily be
drawn to scale. / Diagramme in die vraestel is nie noodwendig
volgens skaal nie.
Section / Afdeling A
QUESTION / Vraag 1
1.1 Various possible answers are provided as to the following
questions. Choose the best answer and write only the letter (A –
D) next to the question. For example 1.1.5 D. / Verskeie
antwoorde word by elke vraag voorsien. Kies die beste antwoord
en skryf slegs die letter (A – D) langs die vraag, bv. 1.1.5 D.
1.1.1 Organisms that can produce their own food are … / Organismes wat
hul eie kos kan produseer is ...
A. heterotrophic / heterotrofies
B. consumers / verbruikers
C. autotrophic / outotrofies
D. automatic / outomaties
1.1.2 The following is needed for photosynthesis: / Die volgende word vir
fotosintese benodig:
A. O2, CO2 and light / en lig
B. H2O, CO2 and light / en lig
C. CO2 and light / en lig
D. H2O and light / en lig

1.1.3 The stomata control the supply of the following raw material that is
necessary for photosynthesis / Die huidmondjies beheer die
beskikbaarheid van die volgende grondstof wat vir fotosintese
benodig word:
A. Enzymes / Ensieme
B. Carbon dioxide / Koolstofdioksied
C. Oxygen / Suurstof
D. Mineral salts / Mineraal soute
1.1.4 Air that has been exhaled contains…/ Lug wat uitgeasem word, bevat ..
A. more carbon dioxide, less oxygen and a small quantity of water
vapour. / meer koolstofdioksied, minder suurstof en 'n bietjie
waterdamp
B. more oxygen, less carbon dioxide and no water vapour. / meer
suurstof, minder koolstofdioksied en geen waterdamp nie.
C. more carbon dioxide, less oxygen and no water vapour. / meer
koolstofdioksied, minder suurstof en geen waterdamp nie.
D. the same amount of carbon dioxide, oxygen and water vapour. /
Dieselfde hoeveelheid koolstofdioksied, suurstof en waterdamp.
1.1.5 How many ATP molecules are formed during alcoholic fermentation
from one glucose molecule? / Hoeveel ATP molekules word tydens
alkoholiese fermentasie van een glukose molekule gevorm?
A. 2
B. 20
C. 36
D. 44 (2 x 5) (10)
1.2 Each of the following statements can be replaced by a biological
term. Write only the term next to the appropriate number. / Elkeen
van die volgende stellings kan vervang word deur 'n biologiese
term. Skryf die korrekte term neer langs die gepaste
vraagnommer.

1.2.1 The green pigment in plants. / Die groen pigment in plante.
1.2.2. The transparent type of tissue in a leaf that allows sunlight to
penetrate.
1.2.3. The form in which plants save glucose. / Die vorm waarin plante
glukose stoor.
1.2.4 The process that takes place in the mitochondria that produce 2 ATP
molecules and CO2. / Die proses wat in die mitochondria plaasvind
waartydens 2 ATP molukes en CO2 gevorm word.
1.2.5 The respiration that takes place in yeast cells. / Die fermentasie wat in
gisselle plaasvind.
(1 x 5)
(5)
1.3 Choose an item from COLUMN A that matches a description in
COLUMN B. Write only the letter (A – P) next to the question
number
(1.3.1 –1.3.10), for example 1.3.6 J.
COLUMN A COLUMN B
1.3.1 Cuticle A – Stiffness in muscles / Stywe spiere
1.3.2 Light dependent B – Formed during a type of respiration /
phase
Gevorm tydens 'n tipe respirasie
1.3.3 NAD C – Liquid content of a chloroplast.
1.3.4 Iodine / Jodium D – Transparent / Deurskynend
1.3.5 O2 shortage / O2
tekort
E – Takes place in the grana of the chloroplast.
F – Used in test for starch / Gebruikj in die
stysel toets
G – Takes place outside the chloroplast.
(1 x 5) (5)
[20]

SECTION / Afdeling B
QUESTION / Vraag 2
An investigation was conducted to show the effects of increasing light
intensity on the rate of photosynthesis of a plant. The plant was tested in two
situations with two different concentrations of carbon dioxide. The results are
recorded in the table below. / 'n Ondersoek was gedoen om die effek van
toenemende ligintensiteit op die fotosintese tempo van 'n plant te ondersoek.
Die plant was getoets in twee situasies met verskillende konsetrasies CO2.
Die tabel gee die resultate.
Light Intensity /
Ligintensiteit
(arbitrêre eenhede)
(arbitrary units)
Production rate of carbohydrates
during photosynthesis / Produksie
tempo van koolhidraat vorming
tydens fotosintese (mg.hour -1 )
In 0,05% CO2 In 0,15% CO2
1 0,9 1,5
2 1,5 2,3
3 2,0 3,1
4 2,3 3,9
5 2,4 4,3
6 2,4 4,3
7 2,4 4,3
2.1 Construct a line-graph of the production rate of carbohydrates
(mg.hour -1 ), plotting both lines (in 0,05% and 0,15% CO2) on the same set of
axes. / Teken 'n lyngrafiek van die produksie tempo van die koolhidrate
(mg.uur -1 ). Teken beide lyne (in 0,05% and 0,15% CO2) op een assestelsel.
(5)
2.2 At what light intensity does the plant reach its maximum rate of
photosynthesis? / By watter ligintensiteit bereik die plant sy maksimum
fotosintese tempo? (1)
2.3 At what light intensity was the production rate at it’s lowest? / By watter
ligintensiteit was die produksie die laagste? (1)
2.4 The rate of carbohydrate production, in both concentrations of CO2
(0,05% and 0,15%) remained constant at light intensities of 5, 6 and 7
arbitrary units. Suggest ONE possible explanation for this phenomenon. /
Gee een moontlike rede waarom die koolhidraat produksie in biede CO2
konsentrasies konstant gebly het by ligintensiteite 5, 6, en 7.(2)
2.5 What is the advantage to a plant of a higher carbon dioxide
concentration? / Wat is die voordeel vir die plant van 'n hoër
koolstofdioksied konsentrasie? (2)

2.6 Food shortages are a major problem in many parts of the world today.
How can the above experimental information be applied in practice, as
a solution to the problem of food shortages? / Voedsel tekorte is
globaal 'n groot probleem. Hoe kan die bogenoemde eksperiment se
resultate en inligting toegepas word in die praktyk as 'n oplossing vir
hierdie voedsel tekorte? (2)
2.7 List the independent and the dependent variables for this experiment. /
Gee die onafhanklike en die afhanklike veranderlikes vir hierdie
eksperiment. (2)
QUESTION 3
3.1 Study the following diagram and answer the following questions. /
Bestudeer die volgende diagram en beantwoord die volgende vrae.
B
E F
3.1.1 Give the labels A to E / Gee A tot E se byskrifte. (5)
3.1.2 Supply 4 adaptations of leafs (visible in the diagram) that helps with
photosynthesis. / Gee 4 aanpassings (wysigings) van 'n blaar (sigbaar
in die diagram) wat fotosintese bevorder. (4)
3.2 Which part of the leaf ….... ? / Watter deel van die blaar …..... ?
3.2.1 Contains the most chloroplasts. / Bevat die meeste chloroplaste?
3.2.2 Is important for gaseous exchange? / Is belangrik vir gaswisseling?
3.2.3 Transports carbohydrates? / Vervoer koohidrate? (3)
[12]
C
A
D
[15]

Question / Vraag 4
B
C
A
4.1 What process takes place at A? / Watter proses vind by A plaas?
(1)
4.2 Name two products are formed during the process at indicated as C? /
Noem twee wat gevorm word in die proses wat as C aangedui word?
(2)
4.3 Where does processes B and C take place respectively? / Waar vind
prosesse B en C onderskeidelik plaas? (2)
4.4 What is the name of the complete process represented by the diagram
above? / Wat is die naam vir die volledige proses wat deur die
bostaande diagram uitgebeeld word? (1)
4.5.1 What step(s) in this overall process will not take place if there is no
oxygen available? / Watter stap(pe) in die algehele proses sal nie
plassvind as daar nie suurstof is nie? (2)
4.5.2 What process will replace these missing step(s) in mammals? / Watter
proses sal die vermiste stap(pe) vervang in soogdiere? (1)
D
E

4.5.3 What product is then formed that causes stiffness? / Watter produk,
wat styfheid veroorsaak, word dan gevorm? (1)
4.6 Give three reasons why one can say that the process represented
by the diagram above is the opposite of photosynthesis. / Gee drie
redes waarom 'n mens kan sê dat die proses wat deur die
bostaande diagram uitgebeeld word die teenoorgestelde is van
fotosintese. (3)
[13]
TOTAL 60 MARKS

Question 1.1
1.1.1 C√
1.1.2 B√
1.1.3 B√
1.1.4 A√
1.1.5 A√
Question 1.2
1.2.1 chlorofil√
1.2.2 Epidermal√
1.2.3 stysel√
1.2.4 Crebs cycle√
1.2.5 alcoholic√
Question 1.3
1.3.1 D√
1.3.2 E√
1.3.3 B√
1.3.4 F√
1.3.5 A√
(2 X 5 = 10)
(1 X 5 = 5)
CONTROL TEST 2
GRADE 10
Total: 60 marks
Time: 1 Hour
MEMO
(1 X 15 = 10)
[20]

SECTION B
Question 2
2.1
√ Heading in capitals containing both variables.
√ X-axis correct label and unit.
√ Y-axis correct label and unit.
√ Correct plotting of data lines.
√ Legend (key) correct or label each line.
2.2 At a light intensity of 5 (arbitrary units). √ (1)
2.3 At a light intensity of 1 (arbitrary units). √ (1)
2.4 The optimal level for photosynthesis had been reached. √
Further increases in light intensity no longer increase the rate of
photosynthesis. √ (2)
2.5 It results in an increase in rate of photosynthesis√ and therefore
increases the rate and quantity of carbohydrates (food) made. √
(2)
2.6 By growing plants in the correct CO2 concentration, optimal
photosynthesis levels will result in the best crop yields. √
Thus, an artificial environment (greenhouse) with greater CO2
concentrations will results in greater crop yields. √ (2)
2.7 independent: light intensity√
dependent: rate of carbohydrate production. √ (2)
[15]
3.1.1 A = palisade B = chloroplast C = cuticle
D = mesophyl E = stoma (5)
(5)

3.1.2 flat / stoma on bottom of leaf / arrangement of palisade / many
chloroplasts in palisade / air spaces etc. (any 4) (4)
3.2.1 palisade
3.2.2 stoma
3.2.3 phloem (3)
4.1 Glycolysis (1)
4.2 ATP and water (2)
4.3 Both in mitochondria (2)
4.4 cellular respiration (1)
4.5.1 B and C (2)
4.5.2 anaerobic respiration (1)
4.5.3 lactic acid (1)
4.6 Uses oxygen while photosynthesis produces oxygen
gives off carbon dioxide while photosynthesis gives off oxygen
make energy available while photosynthesis bonds energy
uses carbohydrates while photosynthesis produces carbohydrates
etc. any 3 (3)
TOTAL 60 MARKS