0510 BIOLOGY 2017 P1

O/LEVEL BIOLOGY - JUNE 2017 Paper 1

SECTION 1
Questions 1-7
(Seven questions)
Directions: Each of these questions or incomplete statements is followed by four suggested answers. Select the best answer in each case and mark the answer sheet appropriately.

1. Which of the following sets of environmental factors would most likely cause the release of
much oxygen in green plants?
A High carbon dioxide concentration, low wind velocity and high light intensity.
B High light intensity, high relative humidity and high wind velocity.
C High carbon dioxide concentration, high light intensity and availability of water.
D High light intensity, high atmospheric pressure and low carbon dioxide concentration

2. Which of the following best describes spirogyra
A Unicellular and saprophytic
B Unicellular and autotrophic
C Multicellular and holozoic
D Multicellular and saprophitic

3.A food solution was tested with Benedict’s solution and the result was a brick red precipitate. The solution contains:
A Protein
B Starch
C Reducing sugar
D Lipid

4. In the female reproductive system, sperms follow the following route.
A Vagina, cervix, fallopian tube, uterus.
B Vagina, fallopian tube, cervix, uterus.
C Vagina, cervix, uterus, fallopian tube.
D Vagina, uterus, cervix, fallopian tube.

5. The bending of a shoot towards a light source is due to.
A Attraction of shoot by light.
B Light causes auxin production.
C Diffusion of auxin to illuminated side.
D More auxin on the unilluminated side

6. Our body releases sweat to:
A Reduce body temperature.
B Eliminate excess water.
C Prevent dehydration.
D Keep the skin moist.

7. Rennin is produced in:
A Stomach
B Kidney
C Liver
D Pancreas

SECTION II
Questions 8-20
(Thirteen questions)
Directions: This group of questions relates to biological diagrams. Select the best answer for each question.

8. The diagram below shows the life cycle of an organism



The above life cycle is typical of:
A A grasshopper
B A housefly
C A termite
D A cockroach.

9. In the diagram of an adult housefly which of the following is true?
A Has four pairs of legs.
B Has jointed appendages.
C Has two pairs of antennae.
D Is covered by a cuticle made up of cellulose.

10. Which part of the bird’s digestive system contains sand and gravels?
A Stomach
B Crop
C Intestine
D Gizzard.

11. In the water cycle, which process causes water molecules to return to the atmosphere?
A Evaporation
B Urination
C Condensation
D Precipitation.

12.


The diagram above is a pyramid of numbers in an ecosystem. Which of the following is true of the diagram?
A Energy decreases from level 4 to 1.
B The largest organisms are found at the base.
C The number of organisms at each level increases from level 1 to 4.
D Energy flows from level 1 to 4.

13. Below is the diagram of a joint

The function of the part labelled 4 is to
A keep bones in place
B produce Red Blood Cells
C produce antibodies
D produce Synovial fluid

14. Friction is prevented at the joints by:
A Ligament and synovial fluid.
B Capsule and tendon
C Synovial fluid and cartilage.
D Tendon and cartilage

15.

Which of these organisms will be secondary consumers?
A Hawk.
B Beetle.
C Goat.
D Mushroom.

16. Below are diagrams of various types of seeds.

Which would be dispersed by wind?
A.1
B.2
C.3
D.4

17. The diagram below shows a developing foetus in the womb.

What numbered structure serves as shock absorber?
A 1
B 2
C 5
D 6

18. In the longitudinal section of the heart, which of the following statements is true?
A The aorta carries oxygenated blood out of the left atrium.
B The wall of the left ventricle is thicker than that of the right Ventricle.
C The tricuspid valve separates the left atrium and the left ventricle.
D A semi-lunar valve prevents backward flow of blood into the right atrium

19. Below is the diagram of a typical plant cell.

Which numbered structures make the protoplasm?
A 1 and 2
B 2 and 4
C 2 and 3
D 3 and 4

20. Below is the diagram of a bacterium

Which of the numbered structures are absent in an animal cell?
A 2 and 4
B 2 and 6
C 3 and 4
D 5 and 6

SECTION III
Questions 21-25
(Five questions)
Directions: For each of the questions below one or more of the responses is (are) correct. Decide which of the responses is (are) Correct. Then choose:

A If 1, 2 and 3 are all correct
B If l and 2 only are correct
C lf 2 and 3 only are correct
D If 1 only is correct

21.Amoeba
1 Has a small surface area to volume ratio.
2 Has anexcretory structure
3 Is holozoic

22.An ecosystem
1 Is sustained by the interaction of its biotic and abiotic components
2 Constitutes a stable unit.
3 Is an artificial unit.

23.Absorption of mineral salts by plants is due to:
1 Active transport
2 Osmosis
3 Root pressure

24.Some components of the glomerular filtrate are
1 Fibrinogen.
2 Glucose
3 Salt.

25. When the body temperature rises above normal, the following corrective action(s)take(s) place
1 Decreased metabolism.
2 Much blood to the surface.
3 Hair lies flat on the skin.

SECTION IV
Questions 26-30
(Five questions)
Directions: Each of the following questions consists of a statement in the left-hand column followed by a second statement in the right-hand column.
Decide whether the first statement is true or false.
Decide whether the second statement is true or false. Then, on the answer sheet mark

A If both statements are true and the second statement is a correct explanation of the first statement.
B. If both statements are true and the second statement is NOT a correct explanation of the first statement
C If the first statement is true but the second statement is false.
D If both statements are false.

26.1st statement: Viruses are capable of reproduction
2nd Statement: Viruses are cells.

27. 1st statement: Bony fish extract dissolved oxygen from water.
2nd statement: Bony fish breathe with their gills.

28. 1st statement: Light is needed to manufacture food in plants
2nd statement: Plants grown in the dark becomes yellowish.

29. 1st statement: Arteries carry blood towards the heart in humans.
2nd statement: All blood vessels have valves to prevent backflow.

30. 1st statement: Deforestation reduces the concentration of oxygen in the atmosphere.
2nd statement: Plants produce oxygen during photosynthesis.

SECTION V
Questions 31-40
(Ten questions)
Directions: Each question consists of four lettered headings, A, B, C, D. Select the heading which is closely related to the description which follows.

31.
A Amylase
B Bile
C Pepsin
D Enterokinase
Emulsifies fat.

32.
A Flaccidity,
B Plasmolysis.
C Wilting.
D Turgidity.
Results from the intake of water into a cell.

33.
A Genes.
B Chromosomes.
C Gametes.
D Zygotes.
Fuse during fertilization.

34.
A Mutualism.
B Parasitism
C Predation.
D Saprophytism.
Relationship in which both organisms benefit.

35
A Community.
B Ecosystem.
C Biome.
D Population.
Individuals of the same species in a particular habitat.

36.
A Vector
B Ligase
C Plasma
D Restriction enzyme.
Joins pieces of DNA together.

37.
A Vagina
B Placenta
C Uterus
D Oviduct
Produces a hormone.

38.
A Low relative humidity
B Low light intensity
C Little or no wind
D Low temperature.
Will increase the rate of transpiration.

39.
A Mitosis
B Cell division
C Meiosis
D Fission.
Production of gametes.

40.
A Carbon dioxide
B Nitrogen
C Water vapour
D Oxygen
Which of these components of air is an excretory product of plants only?

SECTON VI
Questions 41-50
(Ten questions)
Directions: This group of questions deals with biological situations. Each situation is followed by a set of questions. Select the best answer for each question.

41. Anaemia is due to lack of:
A Sodium
B Iron
C Calcium
D Iodine.

42. It is advisable to look at distant objects after reading for a while, this is to:
A Relax the iris and pupil
B Relax the lens and Optic nerve
C Relax the suspensory ligaments and ciliary muscles
D Relax the lens and retina.

43. Below is the diagram of a seedling after being placed horizontally for 3days on moist saw dust

The bending xis due to:
A. Exposure to light
B. More auxins on upper side of root
C. More auxins on lower side of root.
D Gravitational pull on root.

44. A seedling growing in a dark cupboard looks yellowish due to:
A No Chlorophyll Formation
B No absorption of water
C Lack of starch
D No photosynthesis

45. The fore-arm is withdrawn when it is touched by a hot object. Which of the following statements is true about the withdrawal?
A It is due to information from the brain.
B It is a slow action.
C It is due to the secretion of adrenaline.
D It is due to the contraction of biceps.

46. An an experiment, a ring of the bark of a tree was removed. This will result in:
A Lack of water in the leaves.
B Lack of minerals in the leaves
C A reduction in transpiration rate.
D The swelling of the bark on the upper side where the ring was removed

47. Below is a diagram of the photometer.

The leafy shoot in the set up was cut under water to
A Ensure that water enters the xylem.
B Ensure that no air bubbles enter the xylem.
C Ensure that no dust particles enter the xylem.
D Ensure that water does not leave the xylem.

48. What will be the possible parental genotypes of an n individual with blood group
A. AO, BB
B. AA, BO
C. AO, BO
D. AO, AB

49. The presence of carbon dioxide in inspired air is indicated by:
A Sodium bicarbonate becoming milky.
B Lime water becoming milky.
C Lime water becoming clear.
D Pyrogallic acid becoming clear.

50. The presence of mucus in the trachea of humans is:
A To dissolve oxygen.
B To reduce friction.
C To detect the presence of bacteria.
D To trap impurities.

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