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LIVE: PAPER 1 EXAM QUESTIONS 05 NOVEMBER 2014

Lesson Description

In this lesson we:

● Revise various questions related to topics in tested in the various questions in Paper 1

Summary

Paper 1 Overview

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Test Yourself

Question 1

A student was asked to identify the two compounds in each of three test tubes.

The table shows the results of the tests the student performed on each of the compounds.

compound in test tube

reagent added to test tube

sodium hydroxide and copper sulphate

Benedict’s solution iodine solution

X Y Z

violet blue violet

brick red blue blue

brown blue-black blue-black

Which conclusion is consistent with the results?

a. egg white and sucrose had been placed in test tube X.

b. maltose and starch had been placed in test tube Z.

c. maltose and sucrose had been placed in test tube X

d. starch and sucrose had been placed in test tube Y.

Question 2

What ensures that mitosis produces two genetically identical nuclei?

a. One of each of the twenty-three types of chromosome is pulled to each pole of the cell by spindle microtubules.

b. Half of the chromosomes are pulled to each centriole.

c. Identical chromatids are pulled to opposite poles by spindle microtubules.

d. DNA molecules are moved to the equator of the cell where they are replicated.

Question 3

The colour of a ripe peach is determined by the presence of the …

a. Chloroplasts.

b. Leucoplasts.

c. Chromoplasts.

d. All plastids.

Question 4

Root hair cells are …..

a. not living because the wall is lignified

b. concerned with the entry of gases into the plant

c. able to open and close due to uneven thickening

d. waterproof to stop water diffusing into the soil

e. concerned with absorbing water and mineral salts for the plant.

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Question 5

The diagrams below show the distribution of tissues in the stem and root of a dicotyledonous plant.

Which tissues are xylem?

a. I and III

b. I and IV

c. II and III

d. II and IV

Question 6

The diagram shows a student’s drawing of guard cells.

Which label line is incorrect?

Question 7

Which of the following conditions is least likely to increase the rate of transpiration in a plant?

a. a rise in temperature

b. increased air movement

c. an increase in humidity

d. increased sunlight

Question 8

A neurilemma is found around a:

a. muscle fibre

b. neuron

c. myofibril

d. osteocyte

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Question 9

Which diagram represents an organelle that contains the enzymes needed to synthesize ATP in the presence of oxygen?

A B C D

Question 10

The diagram below shows part of a plasma membrane. What label should be used for structure I?

a. Peripheral protein

b. Phospholipid

c. Cholesterol

d. Integral protein

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Exam Questions

Question 1

An investigation was conducted to investigate the effect of different temperatures and pH levels on the activity of an enzyme from the human digestive system. In each case the enzyme was provided with 12 grams of substrate to break down so the complete breakdown would be indicated by 12 grams of product. The results of the investigation are shown in the graph below. Study the graph and answer the questions which follow:

Graph showing the effect of temperature and pH on the activity of an enzyme from the human digestive system.

1.1. With reference to the graph, state the optimum temperature and pH of this enzyme. (4)

1.2. At each temperature and pH level, the enzyme was allowed to react for 20 minutes before the amount of product was measured. Was the enzyme ever working effectively enough to break down all the substrate molecules? Explain your answer. (3)

1.3. Explain why the enzyme showed no activity at 45°C. (2)

1.4. In this investigation, name the following:

a. The independent variables (2)

b. The dependent variable (1)

c. TWO controlled variables (i.e. the variables kept constant in this experiment) (2)

1.5. From the graph, determine the amount of product produced at a temperature of 20°C and pH of 4 (2)

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The following table shows an analysis of the nutrients found in 100g portion of breakfast. The breakfast was made up of eggs, bread and butter.

Use the information in the table to answer the following questions:

1.6. Name a vitamin deficiency disease that could result from a diet that consists mainly of eggs. (1)

1.7. Identify the food type that would be best for a person who suffers from night-blindness. Give a reason for your answer. (2)

1.8. Which food type will show no colour change when it is tested with Biuret solution / Millons reagent? (1)

1.9. This breakfast provides very little vitamin C. What food would you recommend to correct this? (1)

Question 2

2.1 Study the diagram below and answer the following questions.

2.1.1. Is this a diagram of a plant or animal cell? Supply TWO visible reasons for your answer. (3)

2.1.2. Identify fully the parts/organelles labeled A, B and D. (3)

2.1.3. a. Name the process which takes place in organelle C (1)

b. Explain TWO ways in which this organelle is structurally suited to its function. (4)

2.1.4. In 1665, Robert Hooke saw the remains of dead cells in a piece of cork while trying out his new microscope. Since then, there has been a tremendous improvement in microscopes. Suggest TWO ways in which people use microscopes today. (2)

2.2 The photomicrographs (A to D) below show the various stages of cell division.

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2.2.1. How do you know that these are plant cells undergoing mitosis? Give two reasons by referring to the photomicrographs. (2)

2.2.2. Label structure 1. (1)

2.2.3. Explain the role of the structures labelled 2 in the cell division process. (1)

2.2.4. Name the phases of cell division that cells A and C are each undergoing, and give a reason in each case that is visible in each photomicrograph. (4)

2.2.5. The photomicrographs are not in the correct cell division sequence. Use the letters

separated by arrows to write down the correct sequence. (eg. A → B → C → D) (1)

2.2.6. Draw a simple labelled diagram to show what one of the chromosomes in photomicrograph A would actually look like. (3)

Question 3

Three types of mammalian muscle tissue are shown below.

3.1. Which muscle tissue is voluntary in its functioning? Explain what this means. (2)

3.2. Name two organs in the body in which muscle tissue C is found. (2)

3.3. Identify muscle tissue A and state how it is adapted for its function. (3)

3.4. Identify the structure labelled x as well as one of the protein fibres that would result in the striated appearance of the cell. (2)

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The photographs below show various human tissues

3.5. Identify each tissue type labeled A, B and C, and for each give one distinctive feature that allowed you to make your identification. (6)

3.6. Explain the function of cells x and the structures labelled y for a person. (2)

3.7. State the importance of the canal labelled z in diagram C. (2)

Question 4

The diagram below represents a portion of a young stem in transverse section, showing the cells.

4.1.1. List the numbers of the parts which strengthen this stem. (3)

4.1.2. Identify the tissue marked 2 and make a labeled diagram to show one whole cell of this tissue. (4)

4.1.3. Does this stem grow thicker each year? Give a reason for your answer based on what you can see in the diagram (2)

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4.2 Study the diagram and answer the questions that follow.

4.2.1. Provide labels for parts 1, 2, 9, 10, 12 (5)

4.2.2. State the number of the region of this plant organ where you find diffusion of gasses? (2)

4.2.3. Question 2 refers to gasses. Which gas moves

a) in at number 12 during the day.

b) out at number 12 during the day

4.2.4. Label parts 3 and 4 and state what is transported by each one. (4)

4.2.5. a) State the name of the tissue in layer 15. (1)

b) Describe a characteristic feature of the tissue in layer 15 (1)

c) Explain why this characteristic feature is found in this layer (1)

d) Chose a characteristic of layer 15 which is also labelled in the diagram on the right. Provide the number on the diagram. (1)

4.2.6. Compare plant and animal tissues:

a) The tissue indicated by labels 1 and 13 is comparable to which animal tissue (2)

b) What is the function of the tissue referred to in a) above? (2)

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Question 5

Study the graph below which shows the rate of transpiration and water absorption in an herbaceous plant.

5.1. Name THREE environmental factors which could directly influence the rate of transpiration from the leaves of the plant. (3)

5.2. Choose ONE of the factors that you have mentioned and explain why it could cause the rapid decrease in the rate of transpiration after 16h00. (3)

5.3. Describe what the plant might look like at 14h00, and explain why. (3)

5.4. Give a reason why the rate of water absorption started to decrease in the late afternoon. (3)

Answers

Test Yourself

1. B 2. A 3. C 4. E 5. D 6. ? 7. C 8. B 9. A 10. D

Exam Questions

Question 1

1.1 36°C and pH4

1.2 No. At no stage was there 12g of product

1.3 Too hot, enzyme denatured , can no longer work properly

1.4 a. temperature and pH

b. grams of product

c. same substrate, same amount of substrate, same amount of enzyme used

1.5 4g

1.6 Scurvy

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1.7 Eggs.High in Vit A

1.8 Butter

1.9 Add any citrus fruit to the diet e.g. oranges, strawberries etc. ( any valid fruit)

Question 2

2.1.1 Animal – no cell wall, chloroplast or large vacuole, has centrioles

2.1.2 A – rough ER

B – nucleus

C- golgi body

2.1.3 a. Cellular respiration

b. cristae increase surface area and enzymes for respiration

2.1.4 study and research of micro-organisms, micro-biology, genetics etc.

2.2.1 cells surrounded by a cell wall √

no centrioles visible √

cell plate forming across middle of cell B

(NOT any reference to cell shape) any 2 [2]

2.2.2 1 = (daughter) chromosome (NOT chromatids at this stage) √ [1]

2.2.3 2 = contract to pull the chromosomes to opposite poles of the cell √ [1]

2.2.4 A = Metaphase - chromosomes lining up along cell equator/middle √

C = Prophase √ - chromosomes condensing/coiling up/becoming more visible √ [4]

2.2.5 C → A → D → B √ [1]

2.2.6

[3]

Question 3

3.1 skeletal muscle tissue B √ - works consciously / controlled by the will etc √ [2]

3.2 blood vessels / intestines / oesophagus / uterus / bladder √ √ any [2]

3.3 cardiac √ - cells connected by bridges √

so that wave of contraction passes over whole heart √ [2]

3.4 x = nucleus √

myosin / actin / myofibrils √ [2]

3.5 A = blood √ - biconcave red blood cells / 2 white cells with odd nuclei √ etc

B = (ciliated) columnar epithelium √ - elongated cells with large oval nuclei /cilia √ etc

C = bone √ - rings / lamellae of bony tissue / osteocytes (bone cells) in lacunae √ etc [6]

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3.6 x – play a role in immunity / produce antibodies / engulf micro-organisms √ etc

y – move dust / mucus out of trachea √ etc [2]

3.7 contains blood vessels √ to nourish the bone tissue or cells √

OR nerves √ so that pain is sensed if bone is damaged etc √ any 1 [2]

Question 4

4.1.1 2, 3 and 5 [3]

4.1.2 Collenchyma (hypodermis)

Heading: 2 marks

Labels 4 marks

Drawing 2 marks [8]

4.1.3 yes, contains cambium [2]

4.2.1 1 = epidermis

5 = xylem

3 = sclrenechyma

6 = parenchyma

4 = cambium [5]

1 = epidermis

2 = cuticle

9 = nucleus

10 = sub-stomatal air chamber

12 = guard cell (5)

4.2.2 14 (1)

4.2.3 a) CO2

b) O2 (2)

4.2.4 Label parts 3 and 4 and state what is transported by each one. (4)

3 = xylem – transports water and mineral salts to the photosynthetic tissue

4 = phloem – transport photosynthetic products to storage organs

4.2.5 a) palisade mesophyll (1)

b) many chloroplasts (1)

c) main photosynthetic tissue (1)

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d) 7 (1)

4.2.6 Compare plant and animal tissues:

a) plants: epidermis – animals: skin (2)

b) prevents entry on micro-organisms and protects against desiccation. (2)

Question 5

5.1 Temperature √, air movement/wind √, light √, humidity √, availability of soil water √. (Any 3) (3)

5.2 e.g. Light – intensity decreases √, stomata close √, rate of transpiration affected by pore diameter √, less evaporation √. (Any 3) (3)

5.3 Plant wilted √, drooping leaves √, cells flaccid √ (Any 1) (1)

Rate of transpiration greater than √ rate of water absorption √ /more water lost √ than gained √. (2)

5.4 Since transpiration rate decreases √, water absorption follows √. Water absorption dependent on transpiration pull/suction force of transpiration √. Or cooling of soil/darkness/stomata close √ with reasoning √√.

(One explanation = max 3) (3)