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Form 4 Biology imtixaanka qaranka 2022 iyo jawaabihiisa

Imtixaanka qaranka Fasalka 4aad ee 2022 ee Form 4 Biology, su'aal su'aal. Ku gal adigoo waqti leh sida imtixaanka dhabta ah, kadibna arag jawaabta iyo sharaxa su'aal kasta.

51 su'aalood, 100 dhibcood
120 daqiiqo

Gal imtixaankan

120 daqiiqo, 100 dhibcood. Su'aalaha doorashada waa laguu saxayaa; jawaabaha qoraalka adiga ayaa ku saxaya qodobada sixitaanka.

Akoon bilaash ah ayaa loo baahan yahay si aad u bilowdo, si jawaabahaaga iyo natiijooyinkaaga loo kaydiyo.

Tilmaamaha ardayga

Answer all questions in the ANSWER BOOKLET.

Part I: Circle the letter of the correct answer (40 Marks)

1
The structural and functional unit of nervous system is:
- A.Neurons
- B.Neurotransmitter
- C.Neuroglia
- D.Nodes of Ranvier
2 dhibcood
2
The substance responsible for skin colour is referred to as
- A.Collagen
- B.Keratin
- C.Melanin
- D.Carotene
2 dhibcood
3
Which of the following parts of the skeletal system protects the spinal cord?
- A.Skull Bones
- B.Sternum
- C.Vemor bone
- D.Vertebral column
2 dhibcood
4
The type of sugar that is found in ribonucleic acid (RNA) is
- A.Deoxyribose
- B.Ribose
- C.Fructose
- D.Xylose
2 dhibcood
5
If a tall pea plant (Tt) is crossed with a short pea plants (tt) the phonotypical ratio will be:
- A.0 : 2 tall to short
- B.3 : 1 tall to short
- C.1 : 1 tall to short
- D.2 : 2 tall to short
2 dhibcood
6
The two main functions of human ear are ....
- A.Hearing and taste
- B.Hearing and balance
- C.Hearing and pressure
- D.Hearing and temperature
2 dhibcood
7
Look at the figure below and then describe the type of gene mutation. Original sequence: A B C D E F G H. After mutation: A B C D G F E H.
- A.Inversion
- B.Deletion
- C.Duplication
- D.Translocation
2 dhibcood
8
The nucleotides of each strand of DNA molecule are binded together by
- A.Hydrogen bond
- B.Phosphodiester bond
- C.Ionic bond
- D.Metallic bond
2 dhibcood
9
The branch of biology that deals with the study of interactions between living organisms and their environment is called:
- A.Ecology
- B.Entomology
- C.Embryology
- D.Etiology
2 dhibcood
10
Ali got cerebellum injury due to car accident, what are the effects that he is most likely to experience:
- A.Fluctuation of body temperature
- B.IncrEasing heart rate
- C.Loss of body balance and posture
- D.Decreasing heart rate
2 dhibcood
11
The physiological inability of muscle to contract resulted of ATP depletion is termed
- A.Muscle fatigue
- B.Muscle tearing
- C.Muscle cramps
- D.Muscle strain
2 dhibcood
12
The technique aimed to correct the mutated genes that cause human disease is
- A.Recombinant DNA
- B.Gene therapy
- C.Gene cloning
- D.Polymerase chain reaction
2 dhibcood
13
Which one of the following set of terms is mismatched?
- A.Cranium and suture
- B.Wrist and pivot joint
- C.Shoulder and ball and socket join
- D.Knee and hinge joint
2 dhibcood
14
If the sequence of (AGC) is a part of DNA, what is the complementary codon of mRNA?
- A.UCG
- B.GGC
- C.AGC
- D.GCU
2 dhibcood
15
The neuron in the diagram below represents a:
- A.Multipolar neuron
- B.Anaxonic neuron
- C.Bipolar neuron
- D.Unipolar neuron
2 dhibcood
16
Hormones that work together in pairs to regulate the level of critical substances are referred to as:
- A.Lipophilic hormones
- B.Steroid hormones
- C.Antagonistic hormones
- D.Non-steroid hormones
2 dhibcood
17
The building block of nucleic acids (DNA and RNA) is
- A.AmiNo acids
- B.Fatty acids
- C.Deoxyribose
- D.Nucleotide
2 dhibcood
18
The increasing concentration of toxic substances in an organisms as trophic level increase in a food chain or food web is described as:
- A.Biological magnification
- B.Biological concentration
- C.Biological accumulation
- D.Biological toxicity
2 dhibcood
19
An enzyme that cuts DNA or genes into fragments is termed as:
- A.Isomerase
- B.Helicase
- C.Ligase
- D.Restriction
2 dhibcood
20
The breeding of two closely related cows to increase milk production is said to be..
- A.Inbreeding
- B.Cross breeding
- C.Hybridization
- D.Crossing over
2 dhibcood

PART II: Match the terms in column A with suitable descriptions in column B (10 marks)

M1
Match the term in column A with the suitable description in column B: Fertilization. Column B descriptions: members of a pair homologous chromosome do not separate; lowers the level of glucose when it becomes rise above normal; controls the output of hormones from pituitary gland; bundles of thread like structures found in skeletal muscles; an organism's complete set of genetic materials; union of male gamete (sperm) and female gamete (egg) to form a zygote; sudden change or error that occur in the genetic materials; excessive nutrients in the aquatic ecosystem that destroys the habitat of fish; large oval opening that locate at the base of the human skull; transfer of genetic instruction in specific gene into RNA molecule.
1 dhibcood
M2
Match the term in column A with the suitable description in column B: Mutation. Column B descriptions: members of a pair homologous chromosome do not separate; lowers the level of glucose when it becomes rise above normal; controls the output of hormones from pituitary gland; bundles of thread like structures found in skeletal muscles; an organism's complete set of genetic materials; union of male gamete (sperm) and female gamete (egg) to form a zygote; sudden change or error that occur in the genetic materials; excessive nutrients in the aquatic ecosystem that destroys the habitat of fish; large oval opening that locate at the base of the human skull; transfer of genetic instruction in specific gene into RNA molecule.
1 dhibcood
M3
Match the term in column A with the suitable description in column B: Eutrophication. Column B descriptions: members of a pair homologous chromosome do not separate; lowers the level of glucose when it becomes rise above normal; controls the output of hormones from pituitary gland; bundles of thread like structures found in skeletal muscles; an organism's complete set of genetic materials; union of male gamete (sperm) and female gamete (egg) to form a zygote; sudden change or error that occur in the genetic materials; excessive nutrients in the aquatic ecosystem that destroys the habitat of fish; large oval opening that locate at the base of the human skull; transfer of genetic instruction in specific gene into RNA molecule.
1 dhibcood
M4
Match the term in column A with the suitable description in column B: Foramen magnum. Column B descriptions: members of a pair homologous chromosome do not separate; lowers the level of glucose when it becomes rise above normal; controls the output of hormones from pituitary gland; bundles of thread like structures found in skeletal muscles; an organism's complete set of genetic materials; union of male gamete (sperm) and female gamete (egg) to form a zygote; sudden change or error that occur in the genetic materials; excessive nutrients in the aquatic ecosystem that destroys the habitat of fish; large oval opening that locate at the base of the human skull; transfer of genetic instruction in specific gene into RNA molecule.
1 dhibcood
M5
Match the term in column A with the suitable description in column B: Transcription. Column B descriptions: members of a pair homologous chromosome do not separate; lowers the level of glucose when it becomes rise above normal; controls the output of hormones from pituitary gland; bundles of thread like structures found in skeletal muscles; an organism's complete set of genetic materials; union of male gamete (sperm) and female gamete (egg) to form a zygote; sudden change or error that occur in the genetic materials; excessive nutrients in the aquatic ecosystem that destroys the habitat of fish; large oval opening that locate at the base of the human skull; transfer of genetic instruction in specific gene into RNA molecule.
1 dhibcood
M6
Match the term in column A with the suitable description in column B: Nondisjunction. Column B descriptions: members of a pair homologous chromosome do not separate; lowers the level of glucose when it becomes rise above normal; controls the output of hormones from pituitary gland; bundles of thread like structures found in skeletal muscles; an organism's complete set of genetic materials; union of male gamete (sperm) and female gamete (egg) to form a zygote; sudden change or error that occur in the genetic materials; excessive nutrients in the aquatic ecosystem that destroys the habitat of fish; large oval opening that locate at the base of the human skull; transfer of genetic instruction in specific gene into RNA molecule.
1 dhibcood
M7
Match the term in column A with the suitable description in column B: Insulin. Column B descriptions: members of a pair homologous chromosome do not separate; lowers the level of glucose when it becomes rise above normal; controls the output of hormones from pituitary gland; bundles of thread like structures found in skeletal muscles; an organism's complete set of genetic materials; union of male gamete (sperm) and female gamete (egg) to form a zygote; sudden change or error that occur in the genetic materials; excessive nutrients in the aquatic ecosystem that destroys the habitat of fish; large oval opening that locate at the base of the human skull; transfer of genetic instruction in specific gene into RNA molecule.
1 dhibcood
M8
Match the term in column A with the suitable description in column B: Hypothalamus. Column B descriptions: members of a pair homologous chromosome do not separate; lowers the level of glucose when it becomes rise above normal; controls the output of hormones from pituitary gland; bundles of thread like structures found in skeletal muscles; an organism's complete set of genetic materials; union of male gamete (sperm) and female gamete (egg) to form a zygote; sudden change or error that occur in the genetic materials; excessive nutrients in the aquatic ecosystem that destroys the habitat of fish; large oval opening that locate at the base of the human skull; transfer of genetic instruction in specific gene into RNA molecule.
1 dhibcood
M9
Match the term in column A with the suitable description in column B: Myofibrils. Column B descriptions: members of a pair homologous chromosome do not separate; lowers the level of glucose when it becomes rise above normal; controls the output of hormones from pituitary gland; bundles of thread like structures found in skeletal muscles; an organism's complete set of genetic materials; union of male gamete (sperm) and female gamete (egg) to form a zygote; sudden change or error that occur in the genetic materials; excessive nutrients in the aquatic ecosystem that destroys the habitat of fish; large oval opening that locate at the base of the human skull; transfer of genetic instruction in specific gene into RNA molecule.
1 dhibcood
M10
Match the term in column A with the suitable description in column B: Genome. Column B descriptions: members of a pair homologous chromosome do not separate; lowers the level of glucose when it becomes rise above normal; controls the output of hormones from pituitary gland; bundles of thread like structures found in skeletal muscles; an organism's complete set of genetic materials; union of male gamete (sperm) and female gamete (egg) to form a zygote; sudden change or error that occur in the genetic materials; excessive nutrients in the aquatic ecosystem that destroys the habitat of fish; large oval opening that locate at the base of the human skull; transfer of genetic instruction in specific gene into RNA molecule.
1 dhibcood

PART III: Use the information in the box below to fill the gaps (10 marks)

Epidermis, Rods, Cerebrum, Pectoral girdle, Deoxyribose, Dwarfism, Consumer, Proteomics, Myosin, Peptide bond

F1
The largest part of the brain is _____. (Words in the box: Epidermis, Rods, Cerebrum, Pectoral girdle, Deoxyribose, Dwarfism, Consumer, Proteomics, Myosin, Peptide bond.)
1 dhibcood
F2
Too low growth hormone causes a condition referred to as _____. (Words in the box: Epidermis, Rods, Cerebrum, Pectoral girdle, Deoxyribose, Dwarfism, Consumer, Proteomics, Myosin, Peptide bond.)
1 dhibcood
F3
The type of sugar that constitute DNA is _____. (Words in the box: Epidermis, Rods, Cerebrum, Pectoral girdle, Deoxyribose, Dwarfism, Consumer, Proteomics, Myosin, Peptide bond.)
1 dhibcood
F4
The outermost layer of human skin is called _____. (Words in the box: Epidermis, Rods, Cerebrum, Pectoral girdle, Deoxyribose, Dwarfism, Consumer, Proteomics, Myosin, Peptide bond.)
1 dhibcood
F5
In a food chain the trophic level of grazing animals can be categorized as primary _____. (Words in the box: Epidermis, Rods, Cerebrum, Pectoral girdle, Deoxyribose, Dwarfism, Consumer, Proteomics, Myosin, Peptide bond.)
1 dhibcood
F6
The light-sensitive cells that are excited by low levels of light is _____. (Words in the box: Epidermis, Rods, Cerebrum, Pectoral girdle, Deoxyribose, Dwarfism, Consumer, Proteomics, Myosin, Peptide bond.)
1 dhibcood
F7
The thick filamentous protein that constitute the skeletal muscle fibers is _____. (Words in the box: Epidermis, Rods, Cerebrum, Pectoral girdle, Deoxyribose, Dwarfism, Consumer, Proteomics, Myosin, Peptide bond.)
1 dhibcood
F8
The bond that links amino acids in a protein is called _____. (Words in the box: Epidermis, Rods, Cerebrum, Pectoral girdle, Deoxyribose, Dwarfism, Consumer, Proteomics, Myosin, Peptide bond.)
1 dhibcood
F9
The large scale study and cataloguing of the structure and function of proteins in the human body is called _____. (Words in the box: Epidermis, Rods, Cerebrum, Pectoral girdle, Deoxyribose, Dwarfism, Consumer, Proteomics, Myosin, Peptide bond.)
1 dhibcood
F10
The upper limbs are connected to the axial skeleton by _____. (Words in the box: Epidermis, Rods, Cerebrum, Pectoral girdle, Deoxyribose, Dwarfism, Consumer, Proteomics, Myosin, Peptide bond.)
1 dhibcood

PART IV: Answer All of the Following Questions

Q1a
Define the following terms: a) Genetic engineering
2 dhibcood
Q1b
Define the following terms: b) Biodiversity
2 dhibcood
Q2
Identify the main parts of nervous system based on the flow chart given. Flow chart: Nervous system divides into [box 1] and Peripheral NS. [Box 1] divides into Brain and [box 2]. Peripheral NS divides into Sensory Division and [box 3]. [Box 3] divides into Autonomic NS and [box 4].
4 dhibcood
Q3
Ahmed has broken his leg in football match to the extent that his bone was protruding through his skin, identify the type of fracture.
4 dhibcood
Q4
Describe uses of DNA fingerprinting in our life?
4 dhibcood
Q5
Using a punnet square, find the phenotype ration of two heterozygote plants (Tt) for their F1 generation.
6 dhibcood
Q6
State the three structural parts of the nucleotide
3 dhibcood
Q7
Summarize the importance of DNA replication
4 dhibcood
Q8
The sequence of DNA strand is ACGTTG, Write the complementary strand of this DNA.
4 dhibcood
Q9
Mention at least three functions of the human skin
3 dhibcood
Q10
Differentiate between species diversity and genetic diversity?
4 dhibcood

Imtixaanka waxaa diyaarisay Federal Ministry of Education, Culture and Higher Education (MoECHE), Somalia. Waxaa lagu wadaagay bilaash si ardaydu ugu diyaargaroobaan. Jawaabaha iyo sharaxyada waxaa qoray macallimiinta Sheerxirfad.

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