Download Biology model examination for grade 12

Biology model examination for grade 12
DIRECTIONS:-THIS PAPER CONTAINS BIOLOGY EXAMINATION FOR GRADE
12. THE EXAMINATION CONTAINS 100 ITEMS AND THE TIME ALLWED FOR
THE EXAM IS ONLY TWO HOURS.THERE IS ONLY ONE BEST ANSWER FOR
EACH ITEM. CHOOSE THE BEST ANSWER FROM THE SUGGESTED OPTIONS
AND MARK ON THE CIRCL CORESPONDING TO YOUR ANSWER ON THE
ANSWER SHEET.
1. The resolution power of a microscope is the ability to
A .See many objects at a time
C .separate two closely placed object
B. to enlarge the object
D. none of the above
2. If we want to find the effect of light on the growth of plants, the
independent variable is
A. height of the plant
C. temperature
B. Light
D. moisture
Question number 3 is to be answered based on the following information
1- Gathering information (background research)
2- Observation & asking questions
3-Testing hypothesis
4- Reporting result
5-Analyzing result & draw conclusion.
6- Constructing hypothesis.
3. The correct step in scientific method is
A. 6—2—3—1—3—5—4
C. 1—2—6—3—5—4
B. 2—1—6—3—5—4
D. 6—1—2—3—5—4
4. The proposed tentative explanation about the observation is
A. prediction
C. validity
B. hypothesis
D. accuracy
5. Among the following ideas, which one could be the prediction of Francesco
Redi experiment in which he has disproved the theory of spontaneous
generation of large organisms?
A. Only flies produce more flies
B. Flies would be found in the open jars, but not in covered jars.
C. The broths in the broken & tilted flask would turn cloudy & those found
in normal swan-necked flask would remain clear.
D. None
6. In scientific experiment a measure of how dependable & consistent a result of
an experiment is
A. accuracy
C. Reliability
B. validity
D. none
7. Molecules can cross a membrane against concentration gradient using
cellular energy by
A. Osmosis
C. facilitated diffusion
B. Diffusion
D. Active transport.
8. Compared to hypotonic solution, hypertonic solutions contain
A. more water
C. less solute
B. More solute
D. A& C
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Biology model examination for grade 12
9. If human blood cell is immersed in distilled water, it will
A. burst
C. be turgid
B. be flaccid
D. be plasmolysed
10. Which molecule produced in Calvin cycle serves as a base for the formation
of all organic molecules?
A. Rubisco
C.Ribulos biphosphate
B. Trios phosphate
D. phosphoglycolate.
11. Which molecules in the cell surface membrane acts as cell identity marker
& enable cells to recognize the other cells?
A. Glyco lipids
C. cholesterol
B. glyco proteins
D. phospholipids
12. A molecule which serves as immediate energy currency for a cell is
A. glucose
C. ATP
B. radiant energy
D. ADP
13. Glycolysis produces all except
A. pyruvate
C. CO2
B. NADH
D. ATP
14. During light reaction of photosynthesis
A. CO2 splits in to C & O
B. water splits in to H2 &O2
C. C & H are combined
D. none
15. Among the following, the prokaryotic organisms are
A. Plasmodium
C. Eukaria
B. Fungi
D. Archea
16. In lytic life cycle of the viruses
A. The viral genetic material integrates itself in to the host DNA.
B. The viruses cause rupturing of the host cell
C. a few viruses are released by exocytosis without killing the host cell.
D. none
17. Which one of the following marriage can cause a problem on the offspring?
A. Rh- woman & Rh- man
C. Rh+ woman & Rh- man
B. Rh- woman & Rh+ man
D. Rh+ woman & Rh+ man
18. A sudden change in DNA of chromosome can usually passed to future
generation if the change occurs in
A. brain cells
C. liver cells
B. Autosomal cells
D. sex cells
19. Bacteriophages are
A. Viruses that infect bacteria
C. bacteria that infect animals
B. bacteria that infect viruses
D. bacteria that infect plants.
20. HIV converts its RNA to DNA in host cells by using the enzyme
A. ligase
C. reverse transcriptase
B. transcriptase
D. polymerase
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21. Which medical procedure is used to identify weather the person is HIV
positive or HIV negative?
A. testing for the existence HIV antibody in his blood
B. Testing for the existence of the viruses in a sample of blood by using the
microscope
C. counting the number of WBC present per ml of blood.
D. none of the above
22. Diseases that are caused as a result of person’s life style are known as
A. human induced diseases
C. degenerative diseases
B. social diseases
D. genetic diseases.
23. Select the true statement about gp120
A. It is a glycoprotein found on the surface of T-helper cells & bind with HIV.
B. It is a glycoprotein on the surface of HIV & bind with CD4 on T-helper
cells.
C. It is a lipoprotein on the surface of HIV.
D. It is a lipoprotein on the surface of T-cells
24. Micro organisms that cause tuberculosis & cholera are first cultured by
A. Robert Koch
C. Joseph liter
B. Louis pastor
D. Redi.
25. The theory that states diseases are caused by micro organism is
A. Theory of spontaneous generation.
C. germ theory
B. Biogenesis
D. Endosymbiont theory
questions 26-28 are to be answered based on the following diagram.
Nitrogen containing
Atmospheric N2
dead bodies
V
W
NH4
Utilized by plants
X
Z
NO2
Y
Y
NO3
NO326. The micro organisms represented by letters X& Y are
A. Nitrosomonas & Nitrobacter
C. Ammonifying bacteria
B. Nitrifying bacteria
D. A& B
27. The process represented by letter ‘W’ is
A. Ammonification
C. Nitrification
B. Nitrogen fixation
D. Denitrification.
28. Which groups of bacteria are represented letter ‘Z’?
A. pseudomonas
C. Nitrobacter
B. Rhizobium
D. Azatobacter
29. Nitrogen fixing bacteria which form symbiotic association with root nodules
of legumes belong to the genus
A. Rhizobium
C. Klebsiela
B. Azatobacter
D. A&B
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30. Two organisms are said to be in completion when
A. they are members of the same species
B. they are members of different species
C. They occupy similar ecological niches
D. Their common resource is in limited supply.
31. Which one of the following occurs in dark reaction of photosynthesis?
A. ATP is synthesis
C. O2 is produced
B. splitting of water
D. Carbon fixation
32. When an organism is temporarily deprived of oxygen it obtains its energy
from
A. Electron transport system
B. Glycolysis & fermentation
C. The oxidation of pyruvic acid in to acetyl-coA
D. the kreb’s cycle.
33. The number of net ATP molecules that are produced from one glucose
molecule in electron transport system is
A. 38
C. 36
B. 34
D. 32
34. How much total ATP molecules a cell can produce from 5 NAD& 5 FADH2 ?
A. 50
C. 30
B. 25
D. 20
35. Which one of the following micro organisms is not involved in sulphur cycle?
A. Desulphovibro
C.Thiobacillus
B. Photosynthetic sulphur bacteria
D. none of the above
36. Select the wrong statement about ecological succession?
A. pioneer communities are the first to inhabit the bare land
B. each stage in the succession alters the environment so that other species
can enter.
C. secondary succession is faster than primary succession to reach climax
community.
D. The second serial stage contains more biodiversity than the third one.
37.The most common non-reducing sugar is
A. Maltose
C. Glucose
B. Lactose
D. Sucrose
38. DNA & RNA belong to the groups of compounds called
A. Nucleic acids
C. Lipids
B. Carbohydrates
D. Proteins
39. DNA differs from RNA in that
A. It is double stranded
B. It is less stable than RNA
C. It contains deoxyribose sugar while RNA contains ribose sugar.
D. A&C
40. From the organic bases needed to form DNA molecule, the prymidin bases
are
A. Adenine & Guanine
C. Uracile & cytocine
B.Tymine & cytocine
D. Guanine & cytocine
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41. Which cultivated plant species of Ethiopia is not correctly matched to its
scientific name?
A. Coccinia abyssinica—Anchote
C. Brassica carinata—Gomenzer
B. Guizotia abyssinica—Niger seed(Nug)
D. Carthamus tincture— Barely
42. The high species richness of plants & animals in Ethiopia is largely due to
A. The presence of better ecological management
B. The presence of national parks at different parts of the country.
C. The presence of several different biomes in the country
D. All.
43. Triglycerides are formed from
A. Three fatty acids & long chain of alcohol
B. Three glycerol molecules & long chain of alcohol.
C. Three glycerol & a fatty acid molecule.
D. Three fatty acids & a glycerol molecule.
44. Which wave length of light penetrates deeper in water than the others?
A. blue & green
C. red & indigo
B. blue & red
D. blue &indigo
45. Which of the following processes do not need energy from ATP?
A. Conduction of nerve impulse
C. Muscle contraction
B. Diffusion & osmosis
D. Glycolysis.
46. In which two of the following organelles ATP can be synthesized in the cell?
A. chloroplast &mitochondrion
B. mithochondrion & golgi bodies
C. mitochondrion & endoplasmic Reticulum
D. Golgi bodies & endoplasmic reticulum
47. Production of ATP in the cell without using ATP synthase enzyme is known
as
A. oxidative phosphorylation
C. Chemiosmosis
B. substrate level phosphorylation
D. anaerobic respiration.
48. Which stage in aerobic respiration does not require oxygen?
A. Glycolysis
C. Krebs cycle
B. Link reaction
D. Electron transport chain.
49. Which one of the following molecules serves as the terminal electron
accepter at the end of electron transport chain is
A. H2
C. FADH2
B. NADH
D. O2
50. Select the chemical reaction that occurs when ATP is utilized by a cell ?
A. ADP+Pi------- ATP +energy
C. ADP + Pi + energy -------ATP
B. ATP -------- ADP + Pi + energy D. ATP + Pi------- ADP + energy.
51. Under anaerobic condition animal cells convert pyruvic acid in to
A. CO2 & ATP
C. Lactic acid & ATP
B. Alcohol & ATP
D. H2O & CO2
52. The light dependent reaction of photosynthesis occurs in
A. Thylakoid membrane
C. Intermembrane space
B. Liquid of Stroma
D. Matrix of grana
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53. Light dependent reaction of photosynthesis ends up with the production of
A. ATP
C. Glucose
B. NADPH
D. A&B
54. Which of the following cannot be recycled in ecosystem?
A. Sulphur
C. Energy
B. H2O
D. carbon
55. In a food chain organisms that are found in first trophic level are
A. Producers
C. Secondary consumers
B. primary consumers
D. Decomposers
56. A theoretical maximum birth rate of an organism when an organism is given
unlimited environmental resource is
A. Carrying capacity
C. dynamic equilibrium
B. Biotic potential
D. None of the above
57. Which one of the following is not true?
A. In exponential population growth the population doubles in each time period.
B. Population number rapidly increases in lag phase of population development.
C. Inter specific competition occurs between members of different species.
D. Predation,disease & competition are all biotic factors that affect population size.
58. From the following carbohydrates which one is not structural carbohydrate?
A. Cellulose
C. Starch
B. Chitin
D. B&C
59. The bond that joins monomers of carbohydrates together to form large
molecules is
A. Glycisidic bond
C. peptide bond
B. ester bond
D. hydrogen bond
60. A chemical reagent that turns red in the presence of lipid is
A. DCPIP
C. Sudan III
B. Benedict’s solution
D. Nitric acid
61. The chemical process in which polymers are converted in to monomers is
known as
A. polymerization
C. hydrolysis
B. condensation
D. dehydration
62. Select the wrong statement about starch & glycogen
A. Both are used to store energy in living cell.
B. Because of their branched structure they can easily be hydrolyzed to
glucose .
C. Since both are insoluble in water, they cannot interfere with the water
balance of the cell.
D. Starch is a polymer of β-glucose while glycogen is polymer of α-glucose.
63. Which one of the following includes all the others?
A. Metabolism
C. Anabolism
B. Catabolism
D. Respiration
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64. Select the incorrect statement about enzymes
A. All enzymes are globular proteins
B. Enzymes speedup the rate of chemical reaction by increasing the kinetic
energy of the substrate molecules
C. Enzymes cannot be consumed in the process of catalyzation.
D. They are easily affected by change in temperature & PH.
65. In enzyme catalyzed reaction, the correct order where E, S &P stand for
enzyme, substrate& product respectively is
A. E+S
ES
S+P
C. E+S
ES
P+E
B. S+P
SP
P+E
D. E+P
EP
E+S
66. The characteristic which doesn’t belong to prokaryotes is
A. having circular DNA
C. membrane bound organelles
B. having cell wall
D. autotrophic mode of nutrition
67. If we drop a piece of potato in to a test tube containing hydrogen peroxide,
the gas evolves. The reason is that potato contains
A. The enzyme catalase
C. Water
B. The enzyme amylase
D. invertase
68. A molecule with a formula C16H32COOH is
A. amino acid
C. Saturated fatty acid
B. Unsaturated fatty acid
D. nucleic acid.
69. Which one is not true regarding the induced–fit model of enzyme
catalyzed reaction?
A. The shape of the substrate is complementary to the active site of the enzyme.
B. Binding of the substrate to the active site brings a conformational change in
active site.
C. The model is sometimes known as hand & glove model.
D. The enzyme substrate complex is an intermediate that requires less energy
than the normal path way.
70. The high value of index of biodiversity suggests that
A. A more stable community
C. The effectiveness of only some species
B. The environment is less hostile D. A&B
71. A type of active transport which involves the creation of extension of plasma
membrane to enclose large particles or the whole organism is
A. Pinocytosis.
C. Receptor mediated endocytosis
B. Phagocytosis
D. Facilitated diffusion.
72. Select the wrong statement
A. Homologues pairs of chromosomes contain genes controlling the same
feature on the same loci.
B. Alleles are different forms of the same gene.
C. Agene is a section of DNA that controls a specific character.
D. DNA is a molecule of inheritance made up of small units called
nucleosides
73. Gregor Mendel developed the idea of dominance from
A. F1 -generation
C. F2- generation
B. Parental generation
D. A&C
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74. Before making a genetic cross in his pea plants, how did Mendel make sure
that his pea plants were homozygous?
A. By making test cross
C. By making cross pollination
B. By making back cross
D. By self pollinating for several generations.
75. The hereditary phenomena which was not discovered by Mendel is
A. Linkage of gene
C. Dominance
B. Segregation of gene
D. Independent assortment.
76. Which method can produce individuals that have identical genetic materials
with each other & with the parent?
A. inbreeding
C. Cloning
B. Cross breeding
D. artificial insemination
77. A genetic cross known as test-cross
A. is used to reveal the genotype of individual showing recessive character.
B. involves crossing individual with dominant character with homozygous
recessive.
C. involves crossing members of F1-generation with either of the two parents.
D. A&B
78. RNA is made from DNA by the process known as
A. Replication
C. Translation
B. Transcription
D. Reverse transcription.
79. Sex-linked disorders such as color blindness & hemophilia are
A. Inherited through X-chromosomes & determined by recessive allele
B. inherited through Y-chromosomes & determined by dominant allele
C. Inherited through autosomal chromosomes
D. Inherited through both X& Y chromosomes
80. Among the following which one is sex-limited character?
A. Cryptorchidism(un decended testicle)
C. Lactation
B. Pattern baldness
D. A&C
81. If we have homozygous round yellow seed & wrinkled green seed, the back
cross to dominant parent produces
A. Four genotypes in the ratio 1:2:2:1
B. Four genotypes in the ratio 1:1:1:1
C. Four genotypes in the ratio 9:3:3:1
D. Three genotypes in the ratio1:2:1
82. If we want to make a test cross for a pea plant with round yellow seed & if
all the crossing products of the test cross have round seed, but some have
yellow seed & some have green seed, the genotype of the plant is
A. RRYy
C. rrYY
B. RRyy
D. RRYY
83. If the sequence of bases on DNA strand is GAACGT , the corresponding base
sequence on messenger RNA is
A. CTTGCA
C. ACGTTC
B. CUUGCA
D. UCGUUC
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84. In a certain family the mother’s blood group is A & The father’s blood
group is un known, but the blood group of their daughter is O. Based on
this,the possible blood group of the father is
A. Blood group O
C. Blood group B
B. Blood group A
D. All.
85. The child is born from hemophilic father & homozygous free mother. The
chance of the child to be hemophilic is
A. 100%
B. 50%
C. 0 %
D. 75%
86. The study of animal behavior is
A. Entomology
C. Ethnology
B. Herpetology
D. Ethology.
87. Which one of the following innate behavior is a non directional movement
response in which the rate of movement is related to the intensity of the
stimulus rather than the direction of the stimulus?
A. Photo tropism
C. Reflex action
B. Taxes
D. Kinesis
88. Among the following the one which do not provide evidence for evolution is
A. Comparative anatomy
B. The study of embryological development.
C. The study of fossil records
D. None of the above
89. A Mule, the offspring of male donkey & female horse is sterile. This
indicates that Donkey & Horse
A. Do not share common ancestor
B. Both of them are sterile
C. Are from different species
D. Have different reproduction seasons
90. Darwin’s theory of evolution considers all except
A. Fecundity
C. natural selection
B. Variation
D. use & disuse of body parts
91. The wing of birds & forelegs of mammals are
A. Homologues structures
B. Analogues structures
C. Inheritable structures
D. vestigial structures
92. Learning to ignore stimulus & dropping responding to it is
A. Imprinting
C. Association learning
B. Sensitization
D. Habituation.
93. Which one of the following biome is not correctly matched to what it
contains?
A. Tropical rain forest------ high biodiversity.
B. Desert --------Cacti
C. Savanna------ large herbivores
D. Deciduous forest ------- Evergreen trees
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94. In Ivan Pavlov experiment, the conditional stimulus is
A. Salivation in response to sight of food
B. Sound of the bell
C. Salivation in response to bell sound
D. None of the above
95. In the formation of DNA strand, the bond that holds nucleotides together is
A. Hydrogen bond
C. Phosphodiester bond
B. Ester bond
D. Glycosidic bond
96. If a substance binds with the enzyme away from its active site & causes a
change on a structure of active site, the substrate cannot bind to the
enzyme’s active site& the enzyme activity is inhibited. Such kind of enzyme
inhibition is called
A. End point inhibition.
C. Allostric inhibition
B. Competitive inhibition
D. permanent inhibition
97. Which plant growth hormone co-ordinates growth movements such as
tropism?
A. Auxins
C. Cytokines
B. Gibberlines
D. Ethylene
98. In DNA of certain organism, guanine is 15%. The percentage of thymine
base would be
A. 35%
C. 75%
B. 15%
D. 30%
99. Honey bee coming to the hive collecting a lot of nectar informs other
members where the flower is found in excess by a means of
A. Vibrating wings
C. Releasing hormone
B. Dance movement
D. Sound language.
100. Which of the following isolating mechanism is post zygotic isolation?
A. Hybrid sterility
C. Seasonal isolation
B. Mechanical isolation
D. Behavioral isolation.
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OROMIA EDUCATION BUREAU
Answers for biology model examination for grade 12, 2006 E.C./2014
1. C
26. D
51. C
76. C
2. B
27. B
52. A
77. B
3. B
28. A
53. D
78. B
4. B
29.A
54. C
79. A
5. A
30.D
55. A
80. D
6. C
31.D
56. B
81. B
7. D
32. B
57. B
82. A
8. B
33. D
58. C
83. B
9. A
34. B
59. A
84. D
10. B
35. D
60. C
85. C
11. B
36.D
61. C
86. D
12. C
37. D
62. D
87. D
13. C
38. A
63. A
88. D
14. B
39. D
64. B
89. C
15. D
40.B
65. C
90. D
16. B
41.D
66. C
91. A
17. B
42. C
67. A
92. D
18. D
43.D
68. C
93. D
19. A
44. A
69. A
94. B
20. C
45. B
70. D
95. C
21. A
46. A
71. B
96. C
22. A
47.B
72. D
97. A
23. B
48.A
73. A
98. A
24. A
49.D
74. D
99. B
25. C
50. B
75. A
100.A
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