PHOTOSYNTHESIS & RESPIRATION Questions

Grade 11 Life Sciences Exam School 2013 www.learnxtra.co.za

PHOTOSYNTHESIS & RESPIRATION Lesson Description In this lesson we: 

Work through various questions relating to Photosynthesis & Respiration.

Questions Question 1 (Adapted from SG, Nated 2010, Question 1.1) 1.1

Where does respiration occur in the animal and the plant shown in the diagram below?

A B C D

W only W and X only W, X and Y only W, X, Y and Z

(Adapted from HG, June 2010 Nated, Paper 1, Question 1.1) 1.2

The following are involved in the process of cellular respiration: (i) (ii) (iii) (iv) (v)

Energy Carbohydrates Carbon Dioxide Water Oxygen

Which ONE of the following cominations correctly represents their involvement in the above process? A B C D

(ii) + (iii) = (i) + (iv) + (v) (ii) + (iv) = (i) + (iii) + (v) (i) + (ii) = (iii) + (iv) + (v) (ii) + (v) = (i) + (iii) + (iv)

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Grade 11 Life Sciences Exam School 2013 www.learnxtra.co.za (Adapted from HG, June 2008 Nated, Paper 1, Question 1.1) 1.3

The chemical substance that is used to indicate the presence of starch in leaves is ... Benedict’s solution iodine solution clear lime water methylated spirits

A B C D

Question 2 The diagram below illustrates the internal structure of a leaf. Answer the questions based on it.

2.1

Identify parts A, B and E, as well as cells C and F.

2.2

State the role of each of the following process of photosynthesis:

2.3

(5)

a.) B b.) D c.) E

(1) (1) (1)

Tabulate TWO differences between cells C and F.

(5)

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Question 3 (Adapted from HG, June 2008 Nated, Paper 1, Question 2.2) The schematic representation shows the relationship between two biological processes in a plant cell. Study it and answer the questions that follow.

3.1

Identify organelles X and Y.

3.2

Name the biological process that takes place in the following organelle: a.) Organelle X b.) Organelle Y

(2)

(2)

The arrows 1 to 4 indicate the movement of gases into and out of the organelles. 3.3

Name the gases represented by: a.) b.) c.) d.)

1 2 3 4

(4)

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Grade 11 Life Sciences Exam School 2013 www.learnxtra.co.za 3.4

Name the pigment found in the part labelled B.

(1)

3.5

State the function of the pigment named in QUESTION 3.4.

(1)

3.6

Explain the process that takes place in the part labelled A.

(4)

3.7

Describe the biological importance of the process that takes place in organelle Y.

(3)

Question 4 (Adapted from HG, June 2010 Nated, Paper 1, Question 5.1) A boy runs up a small hill at 12 km/h. The graph below shows the rate at whch lactic acid accumulates in the blood and muscles while the boy is running. When the boy stops running, most of the lactic acid is removed from the blood and muscles and is eventually converted into various substances.

4.1

How much lactic acid was in the boy’s body when he started running?

(2)

4.2

Describe the relationship between the amount of accumulated lactic acid and the time spent running.

(2)

When lactic acid is converted to other substances, what percentage remains as lactic acid? Show ALL calculations.

(3)

4.4

Under what circumstances is lactic acid formed?

(2)

4.5

Name and describe the process that results in the formation of lactic acid.

(5)

4.6

Describe how water is formed during the process mentioned in QUESTION 4.5.

(3)

4.3

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Question 5 (Adapted from SG, June 2008 Nated, Paper 1, Question 1.4) During an investigation a pot plant was placed in a dark cupboard for three days. One of the green leaves from the pot plant was then partially covered with tin foil. After the plant had been exposed to sunlight for two days, the leaf was removed from the plant and treated as shown in the diagram below. Study the diagram and answer the questions that follow.

5.1

Name the TWO chemicals labelled A and B.

(2)

5.2

Why is substance A used in this investigation?

(1)

5.3

Which part of the leaf, the covered part or the uncovered part, will give a positive result at the end of this investigation?

(1)

Name ONE precaution you would take when performing this investigation.

(2)

5.4

Question 6 (Adapted from SG, June 2010 Nated, Paper 1, Question 1.4) The apparatus below was set up by a learner. She made sure that the test tube was initially completely full of water.

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Grade 11 Life Sciences Exam School 2013 www.learnxtra.co.za 6.1

What is the AIM of this investigation?

(1)

6.2

Why was the test tube filled with water?

(2)

6.3

Why was it necessary to leave the apparatus near a warm, sunny window?

(2)

6.4

Name the gas that is present in the bubbles.

(1)

6.5

Describe ONE way in which you would test for the gas named in QUESTION 6.4.

(2)

Question 7 (Adapted from HG, June 2008 Nated, Paper 1, Question 1.5) A learner performed an investigation in which a green leafy twig from an aquating plant was placed in a beaker containing sodium bicarbonate solution. The apparatus was exposed to a light source for a period of time and the intensity of light from the light source was increased at regular intervals. Gas bubbles were released. The number of gas bubbles released per minute was observed and recorded. The results of the investigation are shown in the table below. Study the table and answer the questions that follow.

7.1

What is the aim of the experiment?

(2)

7.2

Name the gas that is released in the investigation.

(1)

7.3

Name the: a.) independent variable b.) dependent variable in this investigation.

7.4

How would the learner ensure that his/her results are reliable?

7.5

Draw a line graph to show the results of the above investigation.

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Question 8 (Adapted from HG, June 2008 Nated, Paper 1, Question 2.3) The diagrams below show the apparatus used in an investigation of a biological process. Study the diagrams and answer the questions that follow.

8.1

What is the aim of the investigation?

8.2

State ONE reason why: a.) Cotton wool is used instead of a rubber stopper. b.) Seeds in X and Y are rinsed in formalin c.) The thermos flasks are fastened upside down.

(2)

(2) (2) (2)

8.3

Name ONE other product formed in this investigation.

(1)

8.4

What will happen to the temperature in flask Z after a few days?

(1)

Question 9 (Adapted from SG, June 2008 Nated, Paper 1, Question 3.2) A group of learners set up an investigation as shown in the diagram below. Study the diagram and answer the questions that follow.

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Grade 11 Life Sciences Exam School 2013 www.learnxtra.co.za 9.1

State the aim of this investigation.

(2)

9.2

Identify the part labelled A and explain why it is placed there.

(3)

9.3

Why is lime water used in this investigation?

(2)

9.4

What is the result of this investigation after 3 hours?

(1)

9.5

Explain how you would set up a control for this investigation.

(2)

Question 10 Tabulate the differences between aerobic and anaerobic respiration.

Question 11 Explain the differences between photosynthesis and respiration.

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