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Form 4 Biology imtixaanka qaranka 2021 iyo jawaabihiisa

Imtixaanka qaranka Fasalka 4aad ee 2021 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.

36 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. Time: 2 hours.

Section A: select the most appropriate choice of the given alternatives (40 Marks)

1
The nerves that arise from the brain are known as _____
- A.Spinal cord
- B.Spinal nerve
- C.Cranial nerves
- D.Central nerves
2 dhibcood
2
The nerve system that is controlled by the hypothalamus is said to be:
- A.Voluntary
- B.Sensory
- C.Autonomic
- D.peripheral
2 dhibcood
3
Using the diagram below indicate the part of the neuron that receives information from other neurons
- A.1
- B.2
- C.3
- D.4
2 dhibcood
4
Using the diagram below answer the question that follows. A girl was involved in an accident and the x-ray showed that the part of the brain indicated by the arrow was damaged due to trauma. What effects would this girl most likely
- A.Partial or complete memory loss
- B.Body temperature fluctuation
- C.Trouble in maintaining balance
- D.Rapid breathing
2 dhibcood
5
The primary function of the melanin is to:
- A.Produce vitamin D
- B.Produce sebum
- C.Waterproof the skin
- D.Provide protection against the sun's UV
2 dhibcood
6
Ali was injected with penicillin through the skin using hypodermic needle. The first integumentary structure through which the needle passed was _____
- A.Reticular layer
- B.Epidermis
- C.Papillary layer
- D.Hypodermis
2 dhibcood
7
In humans, all are the function of the skin except _____
- A.Respiratory gas exchange
- B.Preventing unnecessary water loss
- C.Excretion
- D.Regulation of body temperature
2 dhibcood
8
A type of bone that is classified as irregular bone is known as _____
- A.Leg bones
- B.Vertebrae
- C.Skull
- D.Wrist bones
2 dhibcood
9
Which of the following is NOT part of the appendicular skeleton
- A.Shoulder
- B.Hips
- C.Feet
- D.skull
2 dhibcood
10
_____ releases excess water that helps the skin to regulate body temperature
- A.Sweat gland
- B.Sebaceous gland
- C.Oil gland
- D.Ceruminous gland
2 dhibcood
11
Ali has eaten a bread for breakfast, the glucose level of his blood will:
- A.Increase
- B.Decrease
- C.Remains the same
- D.Decrease and increase
2 dhibcood
12
The thyroxine hormone is secreted by _____
- A.Pituitary gland
- B.Adrenal gland
- C.Thyroid gland
- D.Parathyroid gland
2 dhibcood
13
The tough outer membrane covering the brain and spinal cord of vertebrates is called _____
- A.The dura mater
- B.The pia mater
- C.Arachnoid mater
- D.Cerebrospinal fluid
2 dhibcood
14
If one strand of a DNA is 5' ATCGTTAAGCGAGTCA 3' the complimentary strand would be:
- A.3' TAGCAATTCGCTCAGT 5'
- B.3' ACTGAGCGAATTGCTA 5'
- C.3' TGACTCGCTTAACGAT 5'
- D.3' ATCGTTAAGCGAGTCA 5'
2 dhibcood
15
A black Ox (Bb) was crossed with a white cow (bb). Identify the resulting phenotypic ratio.
- A.0:1 black to white
- B.1:1 black to white
- C.1:0 black to white
- D.3:1 black to white
2 dhibcood
16
According to Mendel the crossing between purple flower (PP) and a white flower (pp) results the F1 generation becoming:
- A.All white
- B.All purple
- C.3 purple:1white
- D.1purple:2white
2 dhibcood
17
Which of the following regions in Somalia do you expect to find a greater species diversity?
- A.Galgudud
- B.Benadir
- C.Bari
- D.Lower Juba
2 dhibcood
18
The groups of organisms that contain the largest estimated number of species are _____
- A.Birds
- B.Plants
- C.Insects
- D.Mammals
2 dhibcood
19
Study the figure shown below, mention the part of the ear that is responsible for hearing:
- A.Semicircular canal
- B.Tympanum
- C.Cochlea
- D.Ear canal
2 dhibcood
20
Farah whose blood group is A heterozygous marries Fatima whose blood group is B heterozygous, what is the probability that one of their children become O.
- A.25%
- B.50%
- C.75%
- D.100%
2 dhibcood

Section B (10 Marks)

Relate the terms in column A with the meanings or function in column B using numbers

B
Relate the terms in column A with the meanings or function in column B using numbers. Column A: 1. Meninges 2. Cerebrum 3. Cerebrospinal fluid 4. Hypothyroidism 5. Genomics 6. Synovial fluids 7. Joint 8. Codon 9. DDT 10. ABO blood group system. Column B: ( ) The largest and most complex part of the brain; ( ) the fluid that provides oxygen and nutrients to the brain; ( ) The layer that covers the brain and spinal cord; ( ) the study of organism's genome; ( ) Thyroid hormone deficiency; ( ) the place where two bones meet; ( ) Lubricating substances found in joints; ( ) Example of codominance and multiple alleles; ( ) The triple base of the mRNA; ( ) dichloro-diphenyl trichloethane.
10 dhibcood

Section C (50 Marks)

C1a
Define the following terms: (4 marks) a. Mutation
2 dhibcood
C1b
Define the following terms: (4 marks) b. Neuron
2 dhibcood
C2a
State the two abnormalities related to the following thyroid activities. (6 Marks) a. Hypothyroidism
3 dhibcood
C2b
State the two abnormalities related to the following thyroid activities. (6 Marks) b. Hyperthyroidism
3 dhibcood
C3a
a) Differentiate between lipophilic and hydrophilic hormones (4 marks)
4 dhibcood
C3b
b) Give examples of lipophilic hormones. (2 marks)
2 dhibcood
C4a
a) Define the term genetic engineering (3 Marks)
3 dhibcood
C4b
b) Genetic engineering uses many methods and tools, list any four of them. (4 marks)
4 dhibcood
C5
Differentiate between species diversity and genetic diversity (4 marks)
4 dhibcood
C6a
List two examples of: (4 marks) a. Steroid hormones
2 dhibcood
C6b
List two examples of: (4 marks) b. Non steroid hormones
2 dhibcood
C7
Differentiate between type I diabetes and type II diabetes. (4 marks)
4 dhibcood
C8
In the diagram below indicate the lobes of the human brain and name the parts that are numbered A, B, C and D. (4 marks)
4 dhibcood
C9
A colour blind man (X^nY) marries a carrier woman (X^NX^n). What is the probability that their children will be colour blind? (7 marks)
7 dhibcood
C10
The flow chart below indicates the parts of the nervous system. Complete the missing parts in the boxes (4 marks). Nervous system divides into [box 1] and Peripheral Nervous system; [box 1] divides into [box 2] and Spinal cord; Peripheral Nervous system divides into [box 3] and Sensory division; [box 3] divides into [box 4] and Somatic nervous system.
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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