GRADE 11 NOVEMBER 2018 LIFE SCIENCES P1 - Career Times

[Pages:18]NATIONAL SENIOR CERTIFICATE

GRADE 11

NOVEMBER 2018 LIFE SCIENCES P1

MARKS: 150

TIME:

2? hours

This question paper consists of 18 pages.

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INSTRUCTIONS AND INFORMATION

Read the following instructions carefully before answering the questions.

1. Answer ALL the questions.

2. Write ALL the answers in your ANSWER BOOK.

3. Start the answers to EACH question at the top of a NEW page.

4. Number the answers correctly according to the numbering system used in this question paper.

5. Present your answers according to the instructions of each question.

6. ALL drawings must be done in pencil and labelled in blue or black ink.

7. Draw diagrams, flow charts or tables only when asked to do so.

8. The diagrams in this question paper are NOT necessarily drawn to scale.

9. Do NOT use graph paper.

10. You must use a non-programmable calculator, protractor and a compass where necessary.

11. Round off all calculations to two decimals after the comma.

12. Write neatly and legibly.

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SECTION A

QUESTION 1

1.1 Various options are given as possible answers to the following questions. Choose the correct answer and write only the letter (A?D) next to the question number (1.1.1?1.1.10) in the ANSWER BOOK, for example 1.1.11 D.

1.1.1 Carbon dioxide is carried in the blood mainly as ...

A carb amino haemoglobin. B carbonic acid in the erythrocytes. C bicarbonate ions in the red blood cells. D gas bubbles in the blood plasma.

1.1.2 The blood that exits the liver contains ... compared to the blood that enters the liver.

A less glucose B more oxygen C more glucose D less urea

1.1.3 The graphs below (A, B, C and D) represent the relationship between the rate of photosynthesis and temperature.

A

B

C

D

Rate of photosynthesis Rate of photosynthesis Rate of photosynthesis Rate of photosynthesis

20 40 60

Temperature(?C)

20 40 60

Temperature(?C)

20 40 60

Temperature(?C)

20 40 60

Temperature(?C)

Which ONE of the graphs (A, B, C or D) represent the correct relationship between the temperature and the rate of photosynthesis?

A D B A C B D C

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1.1.4 The following components are involved in cellular respiration:

(i) Energy (ii) Carbohydrates (iii) Carbon dioxide (iv) Water (v) Oxygen

Which ONE of the following combinations show the correct way in which the components are involved?

A (ii) + (iii) (i) + (iv) + (v) B (ii) + (iv) (i) + (iii) + (v) C (i) + (ii) (iii) + (iv) + (v) D (ii) + (v) (i) + (iii) + (iv)

1.1.5 E.coli bacteria living in the colon of the human digestive system is an example of ...

A parasitism. B mutualism. C competition. D commensalism.

1.1.6 Irritable bowel syndrome (IBS) is a medical term to describe a disease of the digestive system. Symptoms usually occur after certain foods or drinks were consumed. It can cause sudden and severe diarrhoea.

What consequence can this have for a person?

A Too much water and nutrients will be absorbed in the digestive tract B Too little water will be absorbed, but the nutrients will be absorbed C Too little nutrients will be absorbed, but water will be absorbed D Too little water and nutrients will be absorbed

1.1.7 The sequence of plant succession on a bare piece of land is described below:

(i) Trees start to grow (ii) Mosses and lichens grow and form soil when they die (iii) Soil thickens and small shrubs grow (iv) Soil develops and then grasses and small plants grow

Which of the following sequences leads to the emergence of stable climax community?

A (i)(ii) (iv)(iii) B (ii) (i) (iv)(i) C (ii)(iv)(iii)(i) D (ii)(iii)(iv)(i)

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1.1.8 An experiment was set up to investigate whether oxygen is released during photosynthesis. The result of the experiment is represented in the following diagram.

Bell jar A

Bell jar B

After a short time, the candle went out

The candle continues to burn for a longer period

The following deductions were made before arriving at the final conclusion.

(i) Photosynthesis reduces the amount of CO2 inside bell jar B (ii) The oxygen in bell jar A was completely used up and the burning

is not supported (iii) The photosynthesis increases the amount of oxygen inside

bell jar B (iv) The vapour produced inside bell jar A due to combustion

extinguished the burning candle

Which ONE of the following set of deductions is correct?

A (i) and (iv) only B (i), (ii) and (iii) only C (i), (iii) and (iv) only D (iii) and (iv) only

1.1.9 Which ONE of the following represents an example of where there is no social organisation and the chances of survival are reduced?

A Division of labour in a bee hive B A school of fish moving in various formations C A predator hunting alone D An alpha male in a lion pack is the only one to reproduce with the

females

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1.1.10

A child is taken to the hospital and diagnosed with a form of malnutrition. Upon further investigation, doctors learnt that the child used only maize meal as food. From what type of malnutrition is this child most likely to suffer?

A Anorexia B Kwashiorkor C Marasmus D Bulimia

(10 x 2) (20)

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?1.2.9) in the ANSWER BOOK.

1.2.1 A type of malnutrition in which the person consumes large quantities of high-energy food

1.2.2 The form in which excess glucose is stored in a plant

1.2.3 Different populations occurring in a particular area

1.2.4 The one-way movement of organisms out of a population to a new area

1.2.5 The anaerobic respiration that occurs in yeast cells

1.2.6 The type of energy absorbed by chlorophyll

1.2.7 The type of relationship between two organisms where one completely outcompetes the other

1.2.8 The type of competition between members of different species

1.2.9 The position an organism occupies in an ecosystem

(9 x 1) (9)

1.3 Indicate whether each of the statements in COLUMN applies to A ONLY, B ONLY, BOTH A and B or NONE of the items in COLUMN . Write A only, B only, both A and B or none next to the question number (1.3.1?1.3.3) in the ANSWER BOOK.

COLUMN

COLUMN

1.3.1 Substances that need to be A: Amino acids

digested before absorption B: Glucose

1.3.2 Raw material(s) essential for A: Oxygen

photosynthesis

B: Carbon dioxide

1.3.3 Examples of mutualism

A: Nitrogen fixing bacteria on the

roots of legumes

B: Barnacles on whales

(3 x 2) (6)

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1.4 The following diagrams represent investigations involved in a process which takes place in green plants. The plant/leaves represented as A and C were exposed to sunlight for 4?5 hours.

B

Aluminium foil paper A

white area green area

C

1.4.1 Which investigation (A, B or C) is designed to test for the following?

(a) Chlorophyll is necessary for photosynthesis

(1)

(b) Light is required for photosynthesis

(1)

(c) Oxygen is produced during photosynthesis

(1)

1.4.2 Give the LETTER of the investigation that does not show a control.

(1)

1.4.3 Which investigation(s) need(s) a chemical to test for whether

photosynthesis took place?

(2)

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1.5 The diagram below shows a diagrammatic representation of the digestive system.

Mouth X

Stomach

Small

P

intestine

Q

Large intestine

1.5.1 Name the part of the alimentary canal represented by X.

(1)

1.5.2 By which process is food moved through structure X?

(1)

1.5.3 Name the glands P and Q that release their secretions into the small

intestine.

(2)

1.5.4 Name the part of the alimentary canal where the digestion of proteins

begins.

(1)

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