POST UTME UNIBEN 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of the human respiratory system is shown below. Which part of the system is responsible for exchanging oxygen and carbon dioxide?
A. Trachea
B. Bronchi
C. Alveoli
D. Diaphragm
Question 2
A 0.5 M solution of NaOH is mixed with a 0.2 M solution of HCl. What is the resulting pH?
A. 1
B. 2
C. 3
D. 4
Question 3
In the context of respiration and gas exchange, what is the primary function of the alveoli in the lungs?
A. To exchange oxygen and carbon dioxide between the lungs and the bloodstream
B. To regulate the pH of the blood
C. To filter out pathogens and debris from the air we breathe
D. To produce surfac\tant to reduce surface tension in the lungs
Question 4
A diagram of the human nervous system is shown below. Which part of the nervous system is responsible for controlling voluntary movements?
A. Central nervous system
B. Peripheral nervous system
C. Somatic nervous system
D. Autonomic nervous system
Question 5
What is the primary function of the hypothalamus in the regulation of body temperature?
A. To maintain a cons\tant body temperature
B. To regulate body temperature in response to changes in the environment
C. To produce hormones that stimulate sweating and shivering
D. To produce hormones that inhibit sweating and shivering
Question 6
A plant has the genotype AaBb. What are the possible genotypes and phenotypes of its offspring?
A. AABB, AaBb, aaBB
B. AABB, AaBb, AaBb
C. AABB, aaBB, AaBb
D. AABB, AaBb, aaBB
Question 7
A diagram of the human kidney is shown below. What is the function of the part labeled 'B'?
A. To filter waste from the blood
B. To regulate blood pressure
C. To produce hormones
D. To store urine
Question 8
In the context of population genetics, what is the Hardy-Weinberg principle?
A. The principle states that allele frequencies will remain cons\tant in a population over time
B. The principle states that allele frequencies will change in a population over time
C. The principle states that genotype frequencies will remain cons\tant in a population over time
D. The principle states that genotype frequencies will change in a population over time
Question 9
A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
C. Retina
D. Lens
Question 10
In the context of coordination, what is the primary function of the hypothalamus in regulating body temperature?
A. To produce heat through shivering
B. To lose heat through sweating
C. To regulate the body's thermostat
D. To produce cold through vasoconstriction
Question 11
In the context of evolutionary bio\logy, what is the term for the process by which a population becomes reproductively isolated from other populations?
A. Speciation
B. Adaptation
C. Mutation
D. Genetic drift
Question 12
A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
C. Retina
D. Lens
Question 13
A 0.5 M solution of NaOH is mixed with a 0.2 M solution of HCl. What is the resulting pH?
A. 1
B. 2
C. 3
D. 4
Question 14
A plant has a root system with a radius of 5 cm and a height of 10 cm. If the plant is placed in a pot with a radius of 10 cm, what is the volume of the soil displaced?
A. 1000
B. 2000
C. 3000
D. 4000
Question 15
In the context of growth and regulation, what is the primary function of the gene regulatory network (GRN) in controlling cell fate decisions?
A. To regulate gene expression by controlling transcription factor activity
B. To mediate cell-cell communication and signaling
C. To maintain genome stability and prevent mutations
D. To regulate cell cycle progression and division

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