# Life Sciences Grade 11 P1 2015 QP & Memo

> Grade 11 Life Sciences Paper 1 question paper and memo from the KwaZulu Natal November 2015, 20 pages. Read online or get the free PDF download.

- Page: https://www.hlayiso.com/library/life-science-nov-2015-p1-qp-and-memo/aa55afae-0a38-43ff-9d67-cc9060481a7d
- Updated: 2026-09-27
- Subject: Life Sciences
- Grade: Grade 11
- Document type: Question paper and memo
- Year: 2015
- Exam period: KwaZulu Natal November
- Paper: 1
- Curriculum: CAPS
- Pages: 20

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## About this document

Life Sciences · Grade 11 · KwaZulu Natal November · 2015. Question paper and memorandum, 20 pages. Read online or download the PDF.

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### Page 1

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GREENBURY SECONDARY SCHOOL
DEPARTMENT OF MATHEMATICS AND SCIENCES
FINAL EXAMINATION ~2015

LIFE SCUINCE Pi—~ GRADE 11
EXAMINER : C. JUGDHAW MAX, MARKS : 150
MODERATOR : kK. GOVENDER /S, SINGH TIME : 2.5 hrs
NAME OF LEARNER.....ccsssscoscssessscsssecssscrosssnesessescesore

pescuscevensoraseeneasepereooesecsscacccousanansdensevsneecosecasenoesvensosouonennseneestocecesoenene, eeenncseeenenasesessnoeesucsecaceunsoesesese

INSTRUCTIONS TO LEARNERS :

Answer all questions .

Write neatly and legibly

Draw diagrams in pencil and label in ink
This paper consists of ....11....... pages

BYNE

SECTION _A
QUESTION ONE

1.1 In each of the following questions, four possible answers are given. Choose the most
appropriate answer and then write only the letter corresponding to it, next to the question
number,

Questions 1.1.1 and 1.1.2 are based on the following information :

A biologists caught and marked 10 crabs on the first day . The next day he caught 15 crabs in
( +) the same area, Of these 5 had markings.

1.1.1 What would be the estimate of the number of crabs in the river ?

A. 15 Cc. 5
B. 30 D. 75

1.1.2. Which one of the following would improve the reliability of the estimated number of crabs ?
A. A different part of the river should be sampled ,
B. The crabs should not be allowed to mix with each after marking
C. Several samples should be taken and the average calculated

D. A special bait should be used to attract the crabs.
Pl PTO 1.1.3

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1.1.3. Ifall plants were to be removed from the surface of the earth, which of the following
substances usually forming the atmosphere, will most likely disappear first.

A. carbon dioxide C. water vapour
B. nitrogen D. oxygen

1.1.4 The average daily intake of different food types by two healthy persons is shown in the

following table .
Food ~ Person A Person B
Fat 100g 100g
Carbohydrate 350g 250g
Proteins 150g 250g

The urine of person A will be different from that of person B. It is likely to have ....

A. more glucose C, more urea ( )
B. less glucose D. less urea

1.1.5 Ifthe pH of blood becomes too low, which substance will the cells of the renal tubule extract
from the blood and pass into the filtrate to correct this imbalance ?

A. Potassium ions C. carbonate ions
B. Hydrogen ions D. sodium ions

Question 1.1.6 and 1.1.7 refer to the accompanying diagram.

1.1.6 This diagram represent a......

A. Malpighian body Cc. nephridium
B. nephron D. Bowmans’ capsule

1.1.7 Name the part where the sodium pump mechanism occuts.

A 1 Cc. 3
‘B. 2 D. 4

1.1.8 During light reaction of photosynthesis
A. oxygen is released and glucose is formed
B. carbon dioxide is absorbed and water is formed
C. oxygen is released and hydrogen atoms are formed
D

. carbon dioxide is released and hydrogen atoms are formed
P2 PTO 1.1.9...

ae

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1.1.9 Listed below are steps in a test for starch in green leaves ,
V — boil leaves in alcohol until they are colourless

W — boil leaves in water for two minutes

X — immerse leaves in iodine solution

Y — heat alcohol in water bath
Z-~ rinse leaves in water
In what sequence are these steps carried out 2

A. WYVXZ c. wYvzx
B. VWXYZ D. ZWVXY

1.1.10 During strenuous exercise , tiredness of the muscle results from the accumulation of ...
C) A. alcohol
B. carbon dioxide
C. lactic acid
D. glucose (10x2) 20

P3 PTO 1.2...

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é

1.2. Give the correct biological term for each of the following descriptions . Write only the term next
to the question number, (1.2.1 to 1.2.6)

1.2.1 Elongated chlorophyll — containing cells arranged at right angles to the upper epidermis
of leaves .

1.2.2 A protective membrane surrounding the lungs .
1.2.3 The product , other than carbon dioxide , of fermentation in plants.

1.2.4 The process of filtering the accumulated waste products of metabolism from the blood of a
patient whose kidneys are not functioning properly.

1.2.5 A chronic medical disorder of the lungs in which the air sacs are dilated or enlarged and lack
flexibility. : .

1.2.6 Tube connecting the bladder to the exterior . (6x1)

1.3 State whether each of the statement in COLUMN |, applies to A only, B only , both A and B
or none of the items in COLUMN II.
Write A only , B only , Both A and B or None next to the question number.

COLUMN I COLUMN II
1.3.1 Excessive weight loss which could lead to | A. scurvy
death B. Kwashiorkor
1.3.2 Eating too much carbohydrate and fats A. Obesity
resulting in excessive accumulation of B. Marasmus
adipose tissue
13.3 Breathing muscles A. intercostal muscle
B. diaphragm muscle
13.4 C- shaped cartilaginous rings A. trachea
B. oesophagus
1.3.5 Relationship where an animal captures and | A. predation
kills another animal for its food B. prey
1.3.6 Direct technique used to find out A. census
population size B. aerial photography
1.3.7 Used in the manufacture of beer A. aerobic respiration
B. anaerobic respiration Qx7)14

P4 PTO 14...

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1.4 Choose a term from the list below that matches each of the following example of

social behaviour,
Write only the letter (A to E) next to the question number.

A. Commensalism B. Intraspecific competition C. Parasitism
D. Resource partitioning E. Mutualism
1.4.1 Sea anemone attached to hermit crab and carried along when crab move in search of food.
1.4.2 A tapeworm lives and feeds on the food in the small intestine of man.
1.4.3 Barnacles may be found attached to the skin of whales .
1.4.4 White rhinos competing for water during drought.
1.4.5 Different animals feed on different types of vegetation like grass , shrubs andtrees. (5)

1.5 Study the population pyramids shown below and answer the questions that follow.

male female

ata feral
81-90 (T] Bt-s0
780 nae fl]
sia | 61-70
100 | 160 ,
age aga 4150)
gay 50] group
3140 ., 31-4
230 20
rao 1120
oo | ad
numbers in age group utubers in. age glewp
AGE PYRAMID A AGE PYRAMID B

1.5.1 Which population pyramid (A or B ):
a) shows a birth rate and death rate that is more or less the same ?
b) shows a lower life expectancy ?
c) represents a death rate that is higher ?
d) is more representative of a developed country ?
e) - will more likely be that of Brazil ?

SECTION A -TOTAL 50

PS PTO .... SECTION B..

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SECTION B
QUESTION TWO

2.1 Tom and Jerry , both grade 11 learners knew that light is one of the factors that is required for
photosynthesis. They therefore wanted to investigate the relationship between the light intensity

and the photosynthetic rate (number of bubbles per minute .) They set up the apparatus as
shown below.

They increased the light intensity at regular intervals and then recorded the number of gas bubbles
released per minute . The gas collected causes a glowing splinter to burst into flames .

Study the diagram and answer the questions that follow.

tamp

bubbles
of gas

water with
sodium errant

bicarbonate

water plant smsaunus

{number of gas bubbiesimin}

Rate of photosynthesis

Lightintensity

(distance Irom)

2.1.1. Identify the following in the investigation.

(i) The dependent variable qd)

(ii) The independent variable (Qt) Cc:
2.1.2 » Name the gas that is released into the test tube. qay
2.1.3. Name TWO other environmental factors apart from light , which can influence the

rate at which the gas bubbles are produced, (2)
2.1.4. Why was sodium bicarbonate added to the water ? qd)
2.1.5. State TWO reasons why the process of photosynthesis is biologically important. (2)
2.1,6. Draw a labelled diagram of the organelle in which photosynthesis takes place. (5) (13)

P6 PTO 2.2.....

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2.2 Study the diagram below and then answer the question which follow.

soda lime
suction
—> pump
}
lime water-——-> |____ lime water
A B
Apparatus to investigate a biochemical process
2.2.1 Suggest an aim for the above investigation . ()
2.2.2. State the function of the soda lime . qd)
2.2.3 Explain the difference in the purpose of the lime water in flask A and in B. (2)
; 424 State the expected results in the above investigation . (2)
2.2.5 Explain ONE way each in which the above experimental design could be improved to
achieve ; a) more valid results. (2)
b) reliable results, (2)
2.2.6 Name the organelle in which the Kreb’s cycle takes place . ad) co)
P7 PTO 2,3...

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2.3 Study the diagram below and answer the questions that follow .

2.3.1 In which region of the kidney would you find this structure . (1)
2.3.2. Name the process in urine formation that occurs in this structure . ql)
2.3.3 Identify part C . © a)
2.3.4 Describe TWO structural adaptations of part C for the purpose mentioned in

QUESTION 2.3.2 above. : (4)
2.3.5 Name FOUR substances found in C which will enter the cavity labelled E (4)
2.3.6 Part A is wider than part B .What is the importance of this ? qd)
2.3.7 Name the hormone secreted when there is a shortage of water in A. qd)

2.3.8 Describe how the hormone named in QUESTION 2.3.7 plays its role
under such conditions . (3) (16)

TOTAL 40

P8 PTO Q3....

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Question 3

3.1 Two males and four female . warthogs (types of pigs ) were introduced into a private
game reserve . The warthog population was monitored over a few years and the results
were recorded as shown in the table below.

Year 2000 | 2001 2002 2003 2004 2005
Number of 10 13 40 55 54 54
warthogs
3.1.1 Draw a line graph to represent the data in the table . (7)
3.1.2 Identify the growth form indicated on your graph. dy)

3.1.3 Which year/s represent each of the following phases :

w) (a) lag phase a)
(b) the geometric phase ql)

(c) the equilibrium phase — a)

3.1.4 Explain what is meant by the term “ carrying capacity” . (2)

3.1.5 Using your graph , determine the carrying capacity of the warthog in the
private reserve . (2)

3.1.6 List TWO climatic factors which would have a negative influence

on the carrying capacity. (2)
3.1.7. Explain why food availability is considered a density dependent factor when
t) calculating the carrying capacity of an area. (3)
(20)

P9 PTO 3.2...

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a

3.2 Study the table below showing the content of the air we inhale and the air we exhale

and answer the questions .
Gas Inhaled air Exhaled air
Nitrogen 79% 19%
Oxygen 20% 16%
Carbon dioxide 0.04% 4%
Water vapour A little ‘yA lot
3.2.1 Account for the decrease in the oxygen content in the exhaled air, (3)

3.2.2 How many times more carbon dioxide is there in the exhaled air compared

to the inhaled air ? (2)
3.2.3 Account for this increase in carbon dioxide concentration in the exhaled air . (3)
3.2.4 Explain why the nitrogen content of the inhaled and exhaled air remains unchanged. (2) (10) ( )

3.3. The diagram below represents a section through an alveolus as well as the
surrounding capillary network . The arrows indicate the direction of blood flow.

3.3.1 Name the type of epithelial tissue represented by E. (1)
3.3.2 Asa result of inhalation,will the concentration of oxygen be higher atBorC? (1)

3.3.3, Will oxygen move from B to C or from C to B? (Lt)

P10 PTO 3.3.4...

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"3.3.4 By what process are gases exchanged between the air in B and the blood in C ? ql)

3.3.5 Name ONE form in which oxygen is transported in the blood ?_ (1)
3.3.6 Name THREE forms in which carbon dioxide is transported in the blood . ()
3.3.7 Explain ONE way in which B is adapted to carry out its function . (2) (10)

TOTAL SECTION B : 80

SECTION C
QUESTION 4 -- ESSAY
‘ 4a Describe how the principle of negative feedback operates in controlling the glucose
concentration in a normal healthy person . Also describe the causes , symptoms and
management of the disease diabetes mellitus which results from an inability of the

body to normalise the glucose concentration of the blood.

Content: (17)
Synthesis : (3)
NOTE : NO marks will be awarded for answers in the form of flowcharts or diagrams.

6) TOTAL 20
FINAL TOTAL 150

Pil

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©)

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MEMO — LIFE SCIENCE P1 —~ GRADE 41 NOVEMBER 2015
QUESTION 1

4.3.4 None Ww
111 BY 12.1 Palisade / 4.3.2 Aonly
11.26% 42.2 Pleura % 43.3 BothA&B”
113 DW 42.3 Alcohol “ 134 A “/
144 DW 4.2.4 Dialysis ¥ 135 A
1145 BOW 4.2.5 Emphysema” 43.6 BothA&B Y/
116 B wv 42.6 Urethra ~ 13.7 B a
11.7 D W Ce
118 © W Gx2) 14
1190 Ww

1.1.10 4% (10%2)

1.4.1
442
1.4.3
1.4.4
1.4.5

UUW Prom
YQ N LK

(s)

1.5.1
1.5.2
1.5.3
1.5.4
1.5.5

o>ooD
a

TOTAL + SO

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SECTION B

QUESTION 2

2.1.1 (i) Rate of photosynthesis / no. of bubbles per minute
(ii) Light intensity -~

2.1.2 Oxygen %

2.1.3 Temp Carbo¥ dioxide / water

2.1.4. To provide CO;feeded for the photosynthesis.

2.1.5 - Radiant energy is converted to chemical potential energy and stored in

organic fuel molecule like starch / glucose.“

- Og is released which is used for cellular respiration by living organisms
- Carbohydrate (glucose / starch) are produced serve as Load

2.1.6 Structure of chloroplast

2.2.1. To determine whether cox released during cellular respiration.
2.2.2 Absorb CO: from incoming air.”
2.2.3 In Flask A — the lime water is meant to show that there is no CO2 coming in
from the atmosphere. ~
Flask B — the lime water is used to determine whether the animal has
released CO2. “
2.2.4 Lime water in flask B will turn milky.
Flask B — the water will stay clear.

### Page 15

2.2.5

2.2.6

2.3.1
2.3.2
2.3.3
2.3.4

2.3.5
2.3.6
2.3.7
2.3.8

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(a) - Set up a control without the mouse /
- Set up a similar investigation with different living organisms to verify

results.
(b) - Set up a number of samples / repeat the investigation ae

Mitochondria

In the cortex

Diffusion / Glomerular / Ultra / Pressure filtration

Glomerulus / blood capillary .~

- Walls are made of a single layer facilitate diffusion ’6f substances.

- Many tiny poreg act as micro filters, restricting large substances“uch as
proteins / blood ee L @ 42) &.

- Lots of capillaries‘to ensure large surface area’

Water, glucose, amino acids, urea, uric acid

To create a high pressure in C for filtration.

ADH

4
- Makes collecting duct / distal convoluted tubule more permeable to water

- Allowing more water to be reabsorbed, ~~

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QUESTION 3

VA

3.1.1. Warthog population from the year 2000 — 2005.

’t /

No. of 50
warthog 40
30
20
10

| | | | | |
|

|
2000 2001 2002 2003 2004 2005 x“

Year

3.1.2 Logistic growth form“
3.1.3 (a) 2000 —- 2001”
(b) 2001 - 2003 “
(c) 2004 — 2005 / 2003 to 2005 “
3.1.4 The total number of individuals that the environment can support
3.1.5 54755
3.1.6 Drought / temp, amount of rainfall, fire, flood.
3.1.7 - The number of individualg density in the population will determine the
amount of food available.
- Large population will result in more competition of food, therefore less food
available.~
- Small population will result in less céfmpetition for food, therefore mot food
available.

### Page 17

3.2.1

3.2.2
3.2.3

3.2.4

3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.3.6

3.3.7

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ae
A large amount of oxygen from the inhaleaair diffused through the alveoli

into the blood capillaries. a [3]

1007 (4 + 0,04)=100° *

- As a result of cellular respiration, CO2 is produced as a by-product’

- This high amount of CO2 is brought by the blood to the lung from where it
is released in the exhaled air. LY [3]

It is not absorbed into the blood since it is not needed ‘and therefore the same

amount is exhaled. [2]

Squamous epithelium a“

B~

Btoc ~

Diffusion ~

Oxyhaemoglobin; in solution in the plasma

Bicarbonate #ions-‘~

Cathaemoglobin “

Solution in the plasma [3]
Air sac — lobed,“Greating large surface area for gaseous exchanie.

~- Single layer of squamous epitheliui — rapid diffusion of gas”

- Richly supplied with blood capillariés for transport of gases7~

4
- Moist easy diffusion of gases” [Any 1X2]

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QUESTION 4

4.1

When abnormal levels of glucose are detected ”

By the pancreas “

The islets of Langerhans Secretes hormones

Into the bloodstream”

|

When blood glucose level rises”

insulitis secreted

(

To decrease the blood glucose level f

Back to normal”

I

Insulin secretion is then inhibited

When blood glucose level falls

Glucagor'‘s secreted

|

To increase the blood glucose level”

I

Back to normal 4

1

Glucagon secretion is then inhibited a“

[Any] [10]

Causes of diabetes mellitus

— Inadequate secretion

— Non-secretion of insulin”
— Production of defective insulin “

— Body cells resistant to the action of insulin”

— Inability of the cells to use glucose efficiently a

[Any] [2]

### Page 19

A

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Symptoms

— Glucose in the urine 7

- Frequent urination

~ Extreme thirst ~

- Fatigué? lethargy / faintness
- Nausea’ Vomiting

— Weight loss “
- Blurred vision ~

— Non-healing of wounds J
[Any] [3]

Management of diabetes mellitus

~ Exercise “
— Eating diet suitable for diabetic person 4
~— Using prescribed medication / drugs for the management of diabetes mellitus

[Any] [2]

Content = [17]

All info given is relevant

L - Information presented in correct sequence

Cc - All aspects written on [3]

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