Bio Paper 1 Set 2

8/8/2019 Bio Paper 1 Set 2

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Paper 1 : MULTIPLE CHOICE [40m]

1. Which of the following correctly describes the plant structure shown below?

Cell wall Nucleus LigninA.present absent present

B.present absent absent.C.absent absent present

D.present present present

2. The largest concentration of mitochondria can be found in a/an _____________.A. cheek cell B. ovum

C. muscle cell D. red blood cell

3. In the pancreas, there are groups of cells that make insulin. Which of the following correctly

describes these cells?

A.An organ in an organism

B.An organ system in an organism

C.Cells with a cell wallD.Tissue in an organ

4. Plasmolysis would definitely occur in a spongy mesophyll cell if the cell was left in

___________________.

A.distilled water

B.a mixture of water and blood cells

C.a salt solution more concentrated than the cell sap

D.a sugar solution less concentrated than the cell sap

5. A 50% solution of human saliva was mixed in a test-tube with equal quantity of 0.1% starch

solution. It was left for 30 minutes and then several drops of iodine solution were added. What

would be the final colour of the solution after mixing the contents of the test-tube?A.White

B.BrownC.Green

D.Blue-black


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6. The graph below shows the relative concentrations of different ions inside and outside of an

animal cell.

Which process is directly responsible for the net movement of K+

and Mg2+

into the animal cell?

A. Osmosis B. DiffusionC. Reverse osmosis D. Active transport

7. Which chemical test shows the presence of enzymes in a biological washing powder?A.Benedicts testB.Biuret testC.Ethanol emulsion test

D.Iodine test

8. Banana produces a red precipitate when heated with Benedicts solution. A light blue colourdevelops when chopped banana is mixed with NaOH and CuSO4 solutions.

Using these results only, which nutrients are present in banana?

A.Fats and proteins

B.Starch and proteins

C.Reducing sugar and proteins.

D.Reducing sugar only

9. Catalase is an enzyme found in the liver that breaks down hydrogen peroxide, forming oxygen as

one by-product. In an experiment that was conducted, catalase was added to 5 cm3 hydrogen

peroxide solution and the oxygen produced in the first minute was collected. The same experiment

was conducted but at different temperatures. The results are shown below:

What conclusion cant be drawn from the above results?A.The enzyme was destroyed at low and high temperatures.

B.For every 10C increase in temperature, the rate of reaction doubled.

C.The enzyme only worked at certain temperature range.

D.Rate of reaction is affected by temperature.


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10. The diagram shows the lock and key model of enzyme action.

Which of the following correctly identifies the substrate, enzyme-substrate complex and product?

substrate enzyme-substrate

complex

product

A. X W U

B. U W V

C. X V WD. U V X

Questions 11 and 12 refer to the diagram of a mouses digestive system shown below.

11. No digestive enzymes would be present in the fluid extracted from _______.

A. A B. F

C. H D. J

12. Which of the following below best describes the functions of regions I to J?

Breakdown

of fat

Breakdown of

carbohydrate

Breakdown of

protein

Absorption

of nutients

A. x xB. x xC. x

D.


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13. The bile duct connects the gall bladder to the duodenum. What will happen if the duct is blocked?

A.Reduction in amount of carbohydrate digested.

B.Slower rate of protein digestion.

C.Slower rate of fat digestion.

D.pH of duodenum remains acidic.

Questions 14 and 15 refer to the information given and the following experimental setup used to

investigate the factors essential for photosynthesis.

The taps in the setup can be used to regulate the flow of gas through tubes X and Y. W1 and W2 both

contain distilled water. The plant is continuously illuminated and regularly watered. Prior to setting up the

experiment, the plant has been kept in a dark cupboard for three days.

14. Which of the following would be the best way to test whether photosynthesis has taken place in

the leaves found in tubes X & Y after the experiment is set up, as shown below, for three days?

A.The presence of the starch in the discs cut from the leaves enclosed in the tubes.

B.The size of the leaves enclosed in the tubes.

C.The thickness of the discs cut from the leaves enclosed in the tubes.D.The weight of the discs cut from the leaves enclosed in the tubes.

15. Which of the following modifications would you use to investigate the effect of light on the

process of photosynthesis?

A.Cover tube X.

B.Make no modification to the apparatus as shown above.C.Keep the soda lime tower and cover either tube X or tube Y.

D.Remove the soda lime tower and cover tubes X and Y as well as all other leaves .


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16. The graph shows the rate of plant growth with increasing light intensity.

Which of the following best explains why the graph plateaus/levels off at point X onwards?

A. Point X is light intensity where rate of photosynthesis is optimum/highest.B. At 66 units, there was also excess heat which affected rate of photosynthesis.

C. Light intensity is no longer a limiting factor at point X, affecting rate of photosynthesis.D. Most plants are only able to trap light intensity of around 66 units for maximum rate of

photosynthesis.

17. The table shows the net amount of carbon dioxide taken in by a plant when theres light and theamount of carbon dioxide produced in the dark, at different temperatures.

temperature (oC) 5 15 30

net uptake of CO2 in light

(mg g-1

h-1

)

1.1 2.8 2.0

release of CO2 in dark

(mg g-1h -1)

0.2 0.8 2.4

If the rate of respiration of the plant placed under light is equal to that in the dark, what would be

the uptake of carbon dioxide for photosynthesis at 15oC?

A. 0.8 B. 2.0

C. 2.8 D. 3.6

18. The transport of glucose from the leaves to the other parts of the plant can only take place through

the ____________.

A. lignin tissues B. phloem tissuesC. spongy mesophyll tissues D. xylem tissues


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Air bubble

19. The diagram shows a freshly cut leaf immersed in hot water.

Which of the following is not true?

A.Stomata is located at the place where bubbles are formed.

B.The bubbles are formed due to expansion of air within intercellular air spaces.

C.The hot water has increased the rate of photosynthesis, hence increasing the rate at which

oxygen is produced.

D.The numbers of bubbles on the upper surface of the leaf should be less than that of the

lower surface.

20. The diagram shows three stages in the cardiac cycle.

Which of the following sequences is correct?

A.2, 3, 1

B.1, 2, 3

C.3, 1, 2D.2, 1, 3

21. The table shows the blood groups of four people and the type of blood each received in a

transfusion. Which person is at risk from agglutination/tissue rejection?

Blood Group Blood type received in

transfusionA. B AB

B. A O

C. AB B

D. O O

22. Which of the following is characteristic of emphysema?

A.Destruction of alveolar walls.

B. Increase in the growth of lung tissue.

C. Inflammation of the walls of the bronchi.

D.Thickening of the artery walls to the lungs.

Hot water


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23. The following graph shows the concentration of lactic acid in the blood of an athlete.

Which of the following graphs correctly shows the level of oxygen in his blood?

24. Which changes take place as a result of cellular respiration in cells?

Oxygen Carbon dioxide Dry MassA. Release Used Decreases

B. Used Released IncreasesC. Released Used Increases

D. Used Released Decreases

25. The diagram represents the liver, kidney and some associated blood vessels. In which vessel will

the blood contain the lowest concentration of urea?


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26. A boy closes his left eye but opens his right eye to stare at the cross of the following card.

At a distance about 18 cm from his eyes, he can only see the cross, but not the black dot. The

purpose of this experiment is to __________.A.show that the yellow spot had the highest concentration of cones

B.detect the presence of blind spot in the eyeball

C.measure the relative focal length of the lens in the eyeball

D.measure the adequate distance for reading

27. The four structures listed below are part of the human excretory system.

1 ureter 2 bladder 3 kidney 4 urethra

In which order does a molecule of urea pass through these structures?

First lastA.B.

C.

D.

1 2 3 42 1 4 3

3 4 1 2

3 1 2 4

28. When the pancreas increases the secretion of insulin, the blood glucose level of a mammal will

become lower. Which of the following reasons correctly explains the reason for the change in

blood glucose level?

A.Insulin promotes the conversion of excess glucose to glycogen in the liver and muscles.

B. Insulin increases the excretion of glucose in urine.

C. Insulin promotes the absorption of glucose from the small intestine.

D.Insulin hydrolyses the glucose in blood.

29. The nerve pathway of a simple reflex arc is shown below. Where would the nerves have to be cut

so that there would be no response but the stimulus could still be felt?

30. Which of the following glands produces hormones that can result in fastest feedback responses in

Man?A. Pancrea s B. Adrenal medulla

C. Thyroids D. Testes


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31. Which responses will usually occur when a person is frightened?

A.Adrenaline is released, heart beat increases, pupils of eyes dilate

B.Adrenaline is released, blood glucose increases, urine production increases.

C. Insulin released, breathing rate increases, peristalsis stops

D.Insulin released, eye pupils dilate, saliva secretion stops.

32. The diagram shows 2 flowers of the same species.

Which letter represents cross-pollination?

33. Which of the following shows the correct list of chemicals that can be transported across the

placenta?

Legend:

= crosses placenta

= does not cross placenta

34. Which of the following is found in both DNA and messenger RNA?

A.Sugar-phosphate backbone

B.ThymineC.Ribose sugar

D.Uracil

Fatty acids Urea Red blood cells

A.

B.

C.

D.


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35. The diagram below illustrates the change that occurred in the frequency of phenotypes of an insect

population over 10 generations.

Which of the following statements could be the explanation for the changes?A.A decrease in the ratio of gene a.

B.An increase in the ratio of gene a.C.A decrease in the mutation rate of gene A.

D.An increase in the population of this insect.

36. What is an anticodon?

A.Three bases on a DNA molecule coding for an amino acid in translation.

B.Three bases on a mRNA molecule after transcription from DNA.

C.Three bases on a tRNA molecule involved in transcription from DNA.

D.Three bases on a tRNA molecule involved in translation during protein formation.

37. The micrograph below shows a plant cell at a certain stage of cell division. Which of thefollowing statements best describes the action of chromosomes at this stage?

A.They are duplicating.

B.They are fusing together.

C.They are lining up at the middle of the cell.

D.They are separating to different poles of cell.


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38. The diagram shows the chromosomes in a cell.

Which of the following diagram shows the product ofone division of the cell by mitosis?

39. The concentration of a pesticide in the tissues of the organisms in the following food chain was

measured and shown in the bar chart below.

Food chain:plants small fish large fish bird of prey

Which organism on the bar chart represents the large fish?

40. The table below shows the bacterial count, oxygen level, number of green plants and of

fish, in rivers flowing through four towns, A, B, C, D.

Which town is most likely to be discharging untreated sewage?

Bacterial count Oxygen level Green plants Fish

A. High High Few Few

B. High High Few Many

C. High Low Few Few

D. Low Low Many Few

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Bio Paper 1 Set 2