ETHIOPIAN SECONDARY SCHOOL LEAVING CERTIFICATE

HAMLIE,2015 E.C JULY 2023 G.C

SUBJECT CODE06 BOOKLET CODE_480

TIME ALLOWED: 2 HOURS

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ETHIOPIAN SECONDARY SCHOOL LEAVING CERTIFICATE

 EXAMINATIODN (ESSLCE)
BIOLOGY
SUBJECT CODE 06 BOOKLET CODE480HAMLIE, 2015 JULY 2023
Number of Items: 100 Time Allowed: 2 llours
1.Which one of the following sentences is correct about the activities of the heart?
A.The noise of heartbeat one hears through a stethoscope is the sound of valves.
B.As the heartbeats blood travels through the arteries with a uniform pressure.
C.Diastole is when the heart muscles contract and force the blood out.
D.Systole is when the heart muscles relax and it fills with blood.

2.During culturing micro-organisms, alI of the following activities are important EXCEPT
A. tilting the lid of the Petri dish during inoculation.
B. adding distilled water to a sterilized agar.
C.sterilizing the inoculating loops.
D. transferring target micro-organisms into an agar medium.

3. Which one of the following diseases can be caused by more than one type of
microorganisms?
--

4.symptoms?
A. Syphilis is caused by Neisseria gonorrhoeae.
B.Gonorrhoca has a burning sensation symptom while urinating.
C.Gonorhoea is caused by Treponema pallidum.
D. Syphilis has sore ulceration on the genitals as a symptom.

5.
AThe two lowest units of classification
B.The two middle units of classification
C.The highest and the lowest unit of classification
D.The two highest units of classification
SUBJECT CODE_06 BOOKLET CODE_480
6.In a dihybrid self-crossing of a plant with genotype DdCe, 3600 offspring

A. 300 C. 150
B.450 D.225

7.Identify the correct statement regarding translation in eukaryotic cells. The

B. polymerase assembles free RNA nucleotides into a chain.

C. first two codons of the mRNA enter the ribosome.
D. RNA polymerase moves along the antisense strand.
8.Which of the following sentences explains how crossing over brings variation?
A. In meiosis I, there is splitting up of pairs of homologous cliromosomes and line
up.
B. In meiosis 1, there is exchange of a section of DNA between chromatids.
C. In meiosis Il, homologous chromosomes align themselves independent of other
pairs.
D.In meiosis Il, chromatids from each chromosome are separated at random.

9.Consider the following model of DNA replication.

Which one of the following is true about A,B and C?

A. A and B are identical with each other but not with C.
B/C is not identical with A and B.
C.B and C are not identical with each other.
D.A,Band C are identical with each other.
SUBJECT CODE_06
10. What is the central role of tRNA in translation?
A.
B.Recognizing the codon of mRNA and bring the correct amino acid to the
ribosomes
C.Acting as a template for converting a genetic code into amino acid sequence
D.Assembling the amino acid into a polypeptide chain
11.Which one of the following sentences explains the traditional use of biotechnology?
D.Production
The amount of of energy transferred through the trophic levels drops with each
step using
A.. insulin up of transgenic
the pyramid.
bacteria
B. dairy products at household level
C.myco-proteins under a laboratory
D. vinegar using industrial fermenter

12. Consider the following diagram demonstrating the pyramidofenergy.

 Which of the following is INCORRECT about the above pyramid of energy?
A.The organisms of cach trophic level use large proportion of the energy to build
their body.
B.The organisms of the first trophic level convert light energy into chemical energy.
C. The
15.Which ehergy
one of thelost as heat
following to theabout
is correct surrounding in each trophic level is insignificant.
DNA? It is
SUBJECTA.smaller
CODE 06molecule and coding BOOKLET
for onlyCODE 480
protein.
13. WhichB.one of the
made follow me sentences
of phosphate,sugar is correct about miosis?It
and bases.
A.is the division of sex cells resulting in identical daughter cells.
B.produces four different daughter cells from a single cell.
C.is the division of somatic cells to make identical daughter cells.
D.produces half number of chromosomes from the original cell.

14.A cross between pea plants having heterozygous genotype (Rr) has been made. Which of the
following is correct about the offspring according to the Mendelian inheritance? The
genotypic probability of getting
A. Rr is 25%. 8RR is 50%.B./ Rr is 75%. rT is 25%.cademy

C.a single stranded molecule.

D. less stable and degrades quickly.

16.Which one of the following phyla is characterized bya flexible cartilaginous rod-like structure,
that runs along the dorsal side of the body?
A.. Phylum Mollusca C.Phylum Annelida
B. Phylum Chordata D.Phylum Arthropoda

17.Which one of the following croups of organisms is correctly matched with its phylum?
A. Starfish-Phylum Echinodermata
B.Fish-Phylum Afthropoda
C.-Snail-Phylum Annelida
D.Earthworm-Phylum Mollusca
18.Which one of the following events happens during carbon cycle? Carbon dioxide is
Atransferred from plants to animals by their feeding relationship.
B.absorbed from air when microbes decompose plants and animals.
C.removed from the air by animals during respiration.
 D. returned into the air by plants during photosynthesis.
19. Which one of the following is not the function of the liver?
A.Controlling cholesterol C.Monosaccharide metabolism
B. -Storing glyeogen D.Bile formation
SUBJECT CODE_06 BOOKLET CODE_480
20. A zoologist studied 5 vertebrate species (spA, spB, spC, spD & spE) and deserihed
their features as follows.

spB: Streamlined bodies with scales, gills for gaseous exchange

spD: Dry skin with scales; ectothermic; lungs for respiration

Based on the features listed above, spA, spB, spC, spD and spE can be classified
under the vertebrate classes, respectively.

B. Pisces, Aves,Reptilia, Mammalia, and Amphibia.

C.Pisces,Amphibia, Aves, Reptilia,and Mammalia.
D. Amphibia, Pisces, Aves, Reptilia, and Mammalia.
21.the desert environment?
A. Spreading its seeds in wider areas
B. Increasing number of stomata in its leaves
C. Having broad leaves
D. Storing water in its tissue

22.What is the function of dermis of the skin? It

A.acts as protection against heat loss.
B.protects the entry of pathogens into the body.
C. forms a waterproof around the body tissue.
D. contains blood vessels and sweat glands.
23.Children who play by spinning round and round fast, when they stop,they feel
dizzy.Why?
A.11-gives a sub-subclass to which the enzyme belongs.
A. The otoliths round in the same direction with the head.
B./ I-a reference of Enzyme Commission.
B.The optic nerves reports that the children are still moving.
C.
SUBJECT CODE 06 BOOKLET CODE_480
24. When does menstruation start in women with no obvious reproductive a health
problem? It happens when
A.the fertilized ovum reaches the uterus and attaches into the thick,spongy
lining.
 B.the FSH stimulates the development of a follicle in the ovary and the egg ripens.
C.pregnancy occurs and the embryo obtains nourishment and oxygen.
D.thick spongy lining of the uterus detaches in the absence of pregnancy.

25.Which one of the following sentences is correctly matched with the function of kidney
structures?
A. Bowman's capsule-acts as a filter to produce urine
B. Cortex-monitors the osmotic pressure of the blood
C.Glomerulus-concentrates urine and conserves water
D. Loop of Henle'-involved in ultrafiltration

26. Which of the following temperature controlling mechanisms in homoiotherms is

categorized into behavjoral method?
A. Sweating when the temperature increases
B. Constriction of capillaries when the temperature falls
C. Shivering as a result of drop in temnperature
D.Secking shade when the temperature rises

27. Industries in the medicine sector use glucose oxidase in clinistix strips for
A. restoring blood supply to area of heart muscle.
B. detecting toxie metabolites in the blood.
C. easy diagnosis of diabetes by examining a urine sample.
D. reducing the viscosity of mucus.
28. In the systematic naming of enzymes, assume an enzyme is designated as OIN EC
3.4.11.1.Which of the following correctly describes this enzyme?

C. 4-shows to which main class the enzyme belongs.

D. 3-indicates a subclass to which the enzyme belongs.
SUBJECT CODE06 BOOKLET CODE_48029. Which one of the following
sentences explams the lock-and-key model of enzyme action? The
A.
B.model explains enzyme inhibition in a complete manner.
C.D. attachment of substrate to an enzyme produces a conformational change.
30.Which one of the following sentences is correct about apo-enzymes? They are
A. cofactors that give an enzyme its catalytic activity.
B.proteins that combine with cofactors to form active enzyines.

D. inorganic molecules that bind loosely with the cofactors.

31. How does a competitive inhibitor affect an enzymecatalyzed reaction? By
A. denaturing the active site of the enzyme
B. producing conformational change of the enzyme
C. binding to the allosteric site of the enzyme
D. blocking the active site of the enzyme

32Which one of the following leaf structures is correctly matched with its function?
A. Palisade mesophyll-the main photosynthetic tissue of the leaf
B. Waxy cuticlecontrols the entry of carbon dioxide into the leaf
C. Guard cells-have lots of air space and gas exchange area of the leaf
D. Spongy mesophyll-helps to prevent water loss from the leaf

33.Which one of the following statements correctly describes the movement of materials
in plants?
Passive transport can takes place in the phloem.
BC The transport of organic materials is due to transpiration.Water is
transported in dead tissue.
D.Active transport can take place in the xylem.

34.What will happen if an agriculture extension worker injects gibberellins into a dwarf
plant? The
A. leaves will fall. C.roots will elongate.
B. stem will grow. D.side shoots will grow fast.
SUBJECT CODE 06 BOOKLET CODE_480
35.sowed them in moist soils enriched with nutrients. Then, he recorded his
observations as follows:
SA
·The seedling of this seed emerged from the soil curved while pushing up
through the soil.
·The hypocotyl straightened and carried the cotyledons and plumule
above the soil surface.SB
·The plumule of the seedling pushed its way out of the soil, while the
cotyledon remained underground.
·Unlike what occurred during the germination of SA, the plumule of this
seed did not form a hook.
biologist?
A.Both SA and SB are of monocots.
 B.SA is of a monocot, wvhile SB is of a dicot.
39.A student
C、Bothhas conducted
SA and SB are an experiment using different enzymes to assess the
of dicots.
D. SA is of a dicot, while SB is of a monocot.
results
36.Which as of
one indicated in the following
the following table.correctly describes the properties of
sentences
water?It
A. contracts
use when it freezes and enhancement
ice acts as an insulator.
B. takes
d low energy to change into vapor.
C.allows all light wavelengths to pass through its various depths.
D. requires high amount of energy to heat up.
37. An organic molecule which is an important part of structure of chromosom
is
Aamino acid.C.amylose.
B.Enzyme 'M' cannot enhance
B.glycogen. the rate of reaction further if the temperature
D.triglyceride.
38.In animal cells,30glycogen
exceeds ℃. is hydrolyzed quickly to release glucose f
respiration. This is due to the presence of several
A. microfibrils in its side chain.
B. a-1,6-glycosidie bonds.
C., β-1,4-glycosidic bonds.
D. enzymes that hydrolyse it easily.
SUBJECT CODE_06 BOOKLET CODE_480

Enzymes Rate Optimum temperature

Cofactors used
required℃
X Zn 1.4x10 37
Y Cu 7.7x10 45
Z No cofactor 4.6x10 28
M Co 1.7x10 30
A.. Enzyme 'X' could have enhanced the rate better at temperature slightly higher
than 37℃.

C.The rate enhancement for enzymes 'Z' is less because it didn't use a cofactor.
D. As temperature increases the rate of chemical reaction decreases.
40. This item is based on the following diagram which depicts structural formula of a
biologcal molecule.
 The molecule represented by the above structure is
A. cellulose. C.fatty acid.
B.amylopectin.D.glycerol.
41.Which of the following is an Ethiopian endemic plant?
A.Noug seed C. Bahir zaf
B.Avocado D,Bunna
42. When a biologist shares her research findings with other fellow biologists,she is
A.making her hypothesis.C. drawing her conclusion.
B.reporting her result. D.analyzing her data.
Biology 96 2015/2023
SUBJECT CODE_06 BOOKLET CODE_480
43.Walia In theisabove
thes table, which
an endemic animalnumber
species holds only organic
in Ethiopia which ismolecules?
found in
A.Nechisar National Park.
B.Omo National Park.
C. Bale Mountain National Park.
D.Simien Mountain National Park.

44. All of the following sentences are correct about pollution EXCEPT
A. deforestation increases the amount of CO2 absorbed from the atmosphere.
B.decomposition of dead bodies increases the amount of CO) in the atmosphere.
C.burning fossil fuels increases pollution due to the release of hydrocarbons.
D.burning of wood increases pollution by causing global dimming which blocks sunlight.

45. This item is based on the table below which shows a list of molecules.

No Molecules
1 Calcium carbonate,glucose and methane
2 Carbon dioxide,linoleic acid and water
3 Linoleic acid,glucose and methane
4 Iron III oxide,glycine and glucose
 A. 2 C.4
B. 3 D.1

46.Which of the following enzymes is correctly matched to the food stuffs it acts on?
A.Pepsin-protein C.Amylase-fats
B.Maltase-lipids D. Trypsin-starch

support arrives. Which activity is strictly prohibitedin this situation?

A.Remove any obstacle from the mouth that might block the airway
B.Open
- the airway by removing any obstacles from the mouth
C.Make sure the airway is open and the head is tilted back
D. Give mouth-to-mouh resuscitation if he is conscious
SUBJECT CODE06 BOOKLET CODE_480
48. Consider the following figure which demonstrates air movements during breathing using
the bell-jar model representing the lung.

A. Air enters when the bell-jar thorax contracts

B.Air enters when the rubber sheet is pushed up.
C.Air exits when Y-piece is rotated both clock wise and counter-clockwise.
D.Air exits when the balloon lungs have higher pressure than the external
environment.

49.Which one of the following structures of the heart is correctly matched with its function?
A.Right atrium-contracts and forces deoxygenated blood into the lungs
B.Left ventricle-contracts and forces oxygenated blood around the body
C.Right ventricle-contracts and forces blood into the left ventricles
D.Left atrium-contracts and forces blood into the right ventricles
50. In the aerobic cellular respiration
A. Krebs cycle takes place in the cytoplasm.
B.glycolysis takes place in the mitochondria.
C. electron transport chain takes place in the cytoplasm.
D.pyruvate enters into the mitochondria for further stages.
SUBJECT CODE_06 BOOKLET CODE_4
51. Consider the following diagram showing blood circulation system in the human
body.

In the above diagram, the parts indicated by numbers 1, 2, 3 and 4,are

respectively
A. aorta, vena cava, pulmonary vein, pulmonary artery.

C. pulmonary vein,aorta, vena cava,pulmnonary artery.

D. vena cava,pulmonary artery, dorta, pulmonary vein.
52.Which one of the following descriptions of proteins is correctly matched with its
function in a cell membrane?
A. Peripheral protein-anchor integral proteins to the cytoskeleton
B. Glycoprotcin-reduces the fluidity of the membrane
C. Channel proteins-larger molecules can pass through them
D. Carrier proteins-specific ions can pass along them

53.Suppose a hypothetical cell of 15% solute concentration is put in a beaker

A.From the cell to the beaker C. Both into and out of the cell
BFrom the beaker to the cell D. Both into and out of the beaker

54. Which one of the following is an example of a learned behaviour?

A.Nest-building C.Weaving a web
B.Knee-jerk reflex D. Classicalconditioning
 SUBJECT CODE06 BOOKLET CODE_480
55Which one of the following is correct about transport of substances across the cell membrane?
A.
B.Facilitated diffusion - particles move from high water potential to lower one
C.Passive transport- particles require energy in the form of ATP to derive the transport
D.Active transport-particles move from low to higer concentration using carrier proteins

56.Which one of the following processes of aerobic respiration takes place in the Krebs cycle?
A. Hydrogen atoms carried by reduced NAD and FAD are released and split into protons and
electrons.
B.Two molecules of ATP are used to phosphorylate each molecules of glucose.
C.Two carbon group from acetyl coenzyme Areacts with a 4-carbon compound to form citrate.
D.carbon sugar GP.

57.In the course of evolution, which of the following is true about the human brain?
A. /Modern humans have a brain size between 0.7% and 1.0% of their body mass.
B.Australopithecus have a brain size between 1.8% and 2.3% of their body mass.
C.The pre-humans brain uses 80% of the resting energy requirement.
D.Homo sapiens brain uses 25% of the resting energy requirement.

58All of the following are examples of innate behaviours EXCEPT

A. training killer whales at marine parks.
B.increasing breathing rate during exercise.
Sproducing tears when dust gets into the eyes.a fly moving its maggot into
more humid environment.
SUBJECT CODE06 BOOKLET CODE_480
59. Which one of the following is an example of in-sight learning?
A.Salivation of a dog when a bell was rung in the absence of food.which was paired
with the conditioned stimulus.
B.Use of boxes, after several trials, by a chimpanzee placed in an

C. Exhibition of modifications of natural behaviors of guide dogs,horses or zoo

animals to desired behaviors.
D.Lack of response from a lady,which sat in a shop in which a strong deodorant was
continuously released from a can.
60. Which one of the following is an example of terional befavibur of
A. A male robin threatening an intruder
B. Fixed action of zebra fish to find a mate
C. Penguins huddling to reduce heat loss
 D. Honeybees nesting in a tree

61.One of the following renowned Ethiopian biologists has developed a vaccine for the
rinderpest disease.
A. Professor Sebsebe Demissew
B. Professor Yalemtsehay Mekonnen
C. Professor Beyene Petros
D. Professor Tilahun Yilma

62.A grade nine student has planned to study animal cells using a compound light
microscope. She prepared a slide of stained human cheek cells for this purpose.Which
one of the following activities should she first do?
A.. Adjust the iris diaphragm until the maximum brightness is coming.
B.Set up the microscope with the lowest power objective in place.
C.Using coarse focusing knob to rotate the nosepiece for a higher magnification lens.
D.Looking through the eyepiece lens to move the objectives down.

63. Which one of the following is true about plant cells? They have
A., vacuole which controls all activities of the cell.
B.lysosomes which contain hydrolytic enzymes.
C.chloroplast which is filled with sap, liquids and minerals.
D. cell wall which gives support and strengthen to the cell.
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64. Aplant cell is placed in a solution which has lower solute concentration than its
contents. After a few minutes the cell will become
A.turgid. C.plasmolysed.
B.flaccid.D.burst.
65. Which one of the following is correct about human food digestion?
R Mouth use protease enzyme to breakdown proteins.
C. Large intestine is the site of lipid hydrolysis.

66.a specific position in the beta chains of hemoglobin. This change is an example of
which mutation?
A. Addition C.Inversion
B. Substitution D.Deletion

67.gases that he thought to represent the primitive atmosphere of the Earth.All of the
following were found in his gas mixture EXCEPT
A. NH, C.H2
 B/ CH4 D. CO2
68.Which one of the following sentences explains the Darwin theory of evolution?

B. There is a natural variation in features that are heritable.

C. New features acquired in lifetime are passed to the offspring.
D. There is development of new feature in order to survive.

69.Comparative anatomy provides evidence of evolution because it

A. looks at structural similarities of organisms.
B has remains of animals and plants from the remote past.
C has an impression of animal even if the actual parts are missing.
studies the development of the embryos of vertebrates.
SUBJECT CODE06 BOOKLET CODE_480
70.About 3 million years ago the Isthmus of Panama separated the shrimp on either
side of the isthmus. They still look remarkably similar, but they do not interbreed
with each other. Which type of isolation is described by this scenario?
A./ Seasonal isolation C.Behavioural isolation
B.Geographical isolation D. Temporal isolation
71. In a metabolic pathway, the end-product inhibition occurs when the
A. last product of the pathway inhibits the last enzymatic reaction.
Bfirst product of the pathway inhibits the last enzymatic reaction.
C.first product of the pathway inhibits thethird enzyme of the reaction.
D.last product of the pathway inhibits the first enzymatic reaction.

72. The following graph shows the rate of reaction of catalase enzyme at a constant
temperature and at different substrate concentration (in %).

OIN cells.Schleiden and Schwann stated that all cells come from pre-existing
B.Virchow stated that cell is the unit of structure, physiology and organization of
living things.

From the above graph.we can conclude that catalase was functional with its
minimum tumover rate from substrate concentration of
A. 0.4 to 0.5. C.0.5 to 0.6.
B.0.1 to 0.2. D.0.3 to 0.4.
73.Which one of the following statements is correct about the description of the cell
theory?

C./Modemn cell theory states that cells contain hereditary information that
passes from cell to cell.
D.Spontancous generation theory states that all cells have basically different
chemical composition.
SUBJECT CODE_06 BOOKLET CODE_480
74.A student measured the diameter of onion epidermal cells at a magnification would be the
diameter of individual cells if 8 cells fit into the field of view of the microscope at 100X
magnification?
A.250μm C. 150μm
B.200μm D.300μm

75.Which of the following characteristics of cells is found only in prokaryotic cell?

A.Division of labor within the cell
B.Continuous loop of DNA
C.10-100 μm long
D.Higher level of complexity

76.Which anos the oloyng Dd vrorsis true about vinge

B. Corona virus is a DNA virus.
C.Swine flu is caused by an RNA virus.
D.Herpes simplex is a DNA virus.

77.The following steps are invoIved wheit HIV infects its host cell in the human body.
1.Conversion of viral RNA into DNA and its incorporation into cell's DNA.
2. Viral DNA's transcription into viral RNA and production of proteins.
3.Assemblage of new vira particles from RNA, proteins and Reverse Transcriptase
4.The binding of gp120 of HIV to CD4 of a T-Lymphocyte
5.Fusion of HIV with the plasma membrane of the host cell
6. Release of its RNA and reverse transcriptase into the cell. 42613The logical order of the
steps listed above would be 4,5=13
A.,4,5,6,1,2,3. C. 4,6,5,2,1,3.
B.4,2,5,6,1,3. D.4,1,2,5,6,3.

78.Which one of the following bacteria produces ammonium ion by forming a symbiotic
association with peas and beans?
 A.Klebsiella C.Psuedomonas
B. Azotobacter D.Rhizobium
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79. This item is based on the following diagram which depicts the water cycle.

In the above diagram, the letters A,B,C and D respectively represent

A. evaporation, transpiration,condensation,precipitation.
B.evaporation,precipitation, transpiration, condensation.
C. evaporation,transpiration,precipitation,condensation.
D. evaporation, precipitation, condensation, transpiration.
80.Which one of the following comparisons is true about primary and secondary
successions? Sécondary succession has
A. reduced species diversity.
B.reduced total biomass of the community.
C.has slower progress to reach to the climax.
Dmore stable community.
81. Which one of the following sentences describes the tropical rainforest biome? It has
A.poor and thin soil. C.frozen and rocky soil.
B. sparse-succulent plants. D.migrating animals.
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82. Fresh water biomes like streams and rivers are characterized by the presence or
A.corals,crabs and planktons. C.corals,kelps and angler fish
B.algae,planktons and fish. D.angler fish,algae and crabs
 83.Which one of the following statements correctly describes intra-specific and inter-
specific competitions? In intra-specific competition the
A.competition is less severe but in inter-specific competition it is more.
B.competitionis for a few requirements but in inter-specific competition the
competition is for all requirements.
C.competing individuals have similar adaptation but in intere specific
competition the adaptation is different.
D.competition the individuals are of the same species.

84.Which one of the following stages of cell division is correctly described in meiosis II?
A. Prophase II-pairs of homologous chromosomes split up
B. Anaphase II-chromatids from each chromosome separate
C. Metaphase II-chromosomes pair and exchange segments
D. Telophase II-two haploid cells areproduced

85.Which one of the following evenIs is an example of a sex influenced trait?

A.Pattern baldness C. Ritinitis pigmentosa
86.Betr

A. NAD and EAD are regenerated from reduced NAD and FAD.
B.ATP is produced through oxidative phosphorylation.
C. Profons accumulation created in the inter-membrane space.
D. Reduced NAD supplies hydrogen and becomes oxidized itself.

87. Which one of the following structures of the photosystem is correctly related with
its function?
A. Chlorophyll a-a reaction center molecule
B.Antenna complex-light dependent reaction begins
C. Carotenoid-provides the hydrogen ions
D., Thylakoid-absorbs blue and red pigments

A.four-carbon compound undergoes molecular transformation to generate

oxaloacetate.
B.hydrogen atoms carried by FADH and NADH are released and split into protons and
electrons.
C.citrate losses a carbon atom to form a five-carbon atom compound and CO2.
D.five carbon compound is furtherdecarboxylated to form a four-carbon compound.

89.During light independent reactions of photosynthesis, glucose is synthesized through

A. synthesis of reduced NADP that provides hydrogenion
B.six turns of the Calvin cycle to make one molecule of glucose.
 C.release of hydrogen ions at the electron transport chain.
D.transmission of electrons to the inside of the thylakoid.

90.Which one of the following factors of photosynthesis is correctly matched with its effect?
A. CO2 concentration-limits the reactions by influencing rate of initial reaction with
RuBP
B.Low temperature-limits the rate of reactions by reducing the number of electrons in
the chlorophyll
C. Low Rubisco-limits the number of reactions in the light dependent reaction
D.Light intensity-limits the rate of ATP synthase enzyme action in light dependent
reactions
91. Which one of the following monohybrid crosses can be a test cross?
A. Rr X Rr C. RRXmT
B. RRX Rr D. RRX RR

92. Which of the following is different from the rest with regard to conservation of
vegetation?
A.Using local practices forconservation
B.Replanting of land with endemic species
C.Replanting indigenous tree species
D.Large scale introduction of exotic plants
SUBJECT CODE_06 BOOKLET CODE_480
93. In the nervous co-ordination system, which of the following statements explains
the synapse? It is a
A. chemical that transmits nerve impulses across the nervous system.
B.part of the skull that encloses brain for the purpose of protection.

D. short term change in the electrical potential on the surface of cells.

94.knee jerk reflex. One of them sits down with oneleg loosely crossed over firmly
using the edge of his hand. Which one of the following situations will happen
during this demonstration? The
F Its hyphae secrets enzymes which digest substances in the tissue.
A. impulse travels to the brain.
It enters into the living cells and disrupts the metabolic systems.
B. hit ligament
It attachesstretches
with whitethe muscle.
blood cells and destroy the immune system.
C. lower leg to jerk downwards and inwards.
D.impulse travels to quadriceps muscle from the bmain.
95.Which of the following eye structures is correctly matched with its function?
A. Pupil-serves as the eye's protective outer layer.
B. Iris-controls the amount of light entering the eye.
 C. Comea-provides nutrition to the retina.
D. Choroid-bends the light into the cye.
96.In the CAM photosynthetic pathway.
A. malate is stored in the mesophyll cells during the day.

C. ATP and NADPH are produced during the night.

D. the C4 stage and the Calvin cycle are separated in time.
97. In Gram staining. if some bacteria retain the crystal violet after counter
staining,then the bacteria is A. Gram positive. C. Gram intermediate.
B.Gram negative. D. Gram variable.
98. Which one of the following sentences explains the mechanism of bacterium to
produce disease?
BC.

D.Its genetic material is incorporated into the cell for instruction.

SUBJECT CODE_06 BOOKLET CODE_480

99.Which one of the following sentences explains the role of bacteria in genetic engineening?
They are used to
B. open up a plasmid.

D. contain a recombinant plasmid.

100. Which one of the following sentences describes a virus? It

A. has differentiated organelles.C. is acellular.
B.is saprophytic. D.undergoes respiration.
emy