LIFE SCIENCESGRADE 11 Theory Paper

June 20162hr 30min 120 Marks

Name:____________________________________________

INSTRUCTIONS AND INFORMATION

Read the following instructions carefully before answering the questions:

1. Answer ALL the questions.2. Write ALL the answers on the A4 paper provided. 3. Start the answer 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. Write neatly and legibly. 6. If answers are NOT presented according to the instructions of

each question, candidates will lose marks. 7. ALL drawings should be done in pencil and labelled in blue or

black ink. 8. Only draw diagrams or flow charts when requested to do so. 9. The diagrams in this question paper are NOT necessarily drawn

to scale. 10. The use of graph paper is NOT permitted. 11. Non-programmable calculators, protractors and compasses may

be used. 12. This question paper must be handed in with your answer sheets.13. Write your name on this question paper

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SECTION A (START THIS QUESTION AT THE TOP OF A PAGE)

Question 1

1.1 Various possible options are provided as answers to the following questions. Choose the correct answer and write only the letter (A – D) next to the question number:

1.1.1 Name the microorganism that is not classified in a kingdom.A VirusB FungusC BacteriumD Protozoa

1.1.2 The diagram shows a cross section through a leaf

Where in the leaf does gaseous exchange take placeA 1 and 2B 1 and 3C 2 and 3D 3 and 4

1.1.3 Which of the following is NOT an example of an accessory glandA Salivary glandsB Gall bladderC PancreasD Liver

1.1.4 Food passes from the pharynx to theA throatB tracheaC oesophagusD bolus

1.1.5 Which of the following is not a function of the colon

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A Absorption of mineralsB Digestion of celluloseC Absorption of waterD Site of vitamin manufacture

1.1.6 Movement of gases with the aid of muscular activityA Gas exchangeB RespirationC BreathingD Diffusion

1.1.7 The chemical used to absorb carbon dioxide in an experiment on photosynthesisA Sodium hydroxideB Bicarbonate of sodaC IodineD Starch

1.2 Give the correct word/term for each of the following statements:

1.2.1 An organism without a true nucleus1.2.2 A fluid filled cavity lined with mesoderm1.2.3 The blood cells that transport oxygen1.2.4 The acid that accumulates in the muscles of humans during continuous

strenuous physical activity1.2.5 The part of the human gut in which the digestion of starch begins1.2.6 The process during which insoluble molecules are changes into soluble

ones in the body

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1.3 Indicate whether each of the statements in COLUMN I 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 (1.3.1 to 1.3.?) on your A4 paper.

The answers MUST be written as stated above or NO marks will be awarded.

COLUMN I COLUMN II1.3.1 Formation of seeds A Angiosperms

B Gymnosperms1.3.2 Cephalisation is found in A Platyhelminthes

B Cnidaria1.3.3 The part that is formed from a fertilised

ovuleA SeedB Fruit

1.3.4 The plants where the gametophyte is dominant

A FernB Gymnosperm

1.3.5 Formed during anaerobic respiration in yeast cells

A Carbon DioxideB Ethanol

1.4 Draw a labelled diagram to show the structure of a villus

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1.5 A sample was taken from a patient suffering from a throat infection. The bacteria on the swab were cultured on a nutrient agar in a petri-dish. A multidisc with a different type of antibiotic at the end of each of its six arms was then placed on top of the bacteria. The two halves of the petri-dish were then sealed together and placed in an incubator at 30 ºC. The following diagram shows the result of the investigation after 48 hours:

1.5.1 State ONE difference in activity between antibiotics B and F.1.5.2 The patient was known to be allergic to antibiotic B.

(a) Which antibiotic should the patient be given?(b) Explain your answer to QUESTION 1.5.2 (a)

SECTION A TOTAL: 40 MARKS

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SECTION B

QUESTION 2 (START THIS QUESTION AT THE TOP OF A NEW SHEET OF PAPER)

2.1 The diagram below shows photosynthesis and respiration. Examine this diagram carefully and answer the questions that follow

2.1.1 Identify the organelle where photosynthesis occurs2.1.2 Identify the organelle where cellular respiration takes place and identify the

cells where they would be found.2.1.3 What are the products formed at the end of photosynthesis?2.1.4 Use the diagram above to help you explain what happens during cellular

respiration.

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2.2 Complete the table below. Write down only the number and your answer on the answer paperRequirements for Efficient Gaseous Exchange

Why this requirement is important

Surface area of the gas exchange organ must be large

2.2.1

Surface area must be moist 2.2.2

2.2.3 To allow for rapid diffusion of gases across it

A transport system must be available

2.2.4

2.3 The graph below shows the level of the blood sugar (glucose) of a healthy person during a 12 hour period. Study the graph and answer the questions that follow:

2.3.1 At what time of day is the level of the blood sugar: (a) the lowest and (b) the highest?

2.3.2 At points 1, 2 and 3 on the graph, the concentration of blood sugar drops. (a) Which hormone is responsible for the decrease in concentration? (b) Where in the body is this hormone produced?

2.3.3 Describe the role played by this hormone mentioned in Question 2.3.2 in regulating the level of the blood glucose.

QUESTION 2 TOTAL: 20 MARKS

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Question 3 (start this question at the top of a new sheet of paper)3.1 Read the article below and answer the questions that follow. Endemic species are

found only in a particular area and nowhere else in the world.

Source: State of Environment Outlook Report for the Western Cape Province Biodiversity and Ecosystem Health 2013 https://www.westerncape.gov.za/eadp/sites/default/files/your-resource library/WCSoEOR_02_Biodiv.pdf

3.1.1 What percentage of the indigenous plant species in Cape Town are endemic to Cape Town? Show all working.

3.1.2 Tabulate the three veld types and the number of associated plant species found only in Cape Town.

3.1.3 (a) Identify the only two endemic vertebrate species in Cape Town. (b) To what phylum do the species identified in 3.1.3 (a) belong?

3.1.4 The second last paragraph of the article above mentions the numbers of invertebrates endemic to Cape Town.(a) Which two classes of arthropods are mentioned in this paragraph?(b) Mention the type of gut and number of tissue layers found in all the Arthropods.

3.1.5 Identify three threats to the endemic invertebrate species and describe how these threats could impact negatively on these unique species in Cape Town.

QUESTION 3 TOTAL: 20 MARKS

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Question 4 (start this question at the top of a new sheet of paper)

4.1 Examine the graph below showing the numbers of cases of TB and HIV registered in South Africa and answer the questions that follow.

Source: http://www.newsweek-invisiblekiller.com/

4.1.1 Give a suitable title for this graph4.1.2 Describe the general trend shown in this graph4.1.3 (a) Which do you think comes first: TB or HIV infection?

(b) Explain your choice in 4.1.3 (a)4.1.4 Identify the specific infectious agents that cause

(a) HIV(b) TB

4.1.5 List three symptoms of TB infection

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4.2 This infographic states that malaria is treatable and preventable.

4.2.1 State the cause and describe the transmission of malaria to people.4.2.2 (a) Identify one way malaria can be treated

(b) One way it can be prevented.

QUESTION 4 TOTAL: 20 MARKS

SECTION B TOTAL: 60 MARKS

SECTION C

Question 5 (start this question at the top of a new sheet of paper)

You eat a large piece of fatty steak. Describe what happens to the protein and fat in the steak from the time they reach the stomach until they are assimilated by the cells.

QUESTION 4 TOTAL: 20 MARKSSECTION C TOTAL: 20 MARKS

FINAL: 120 MARKS

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