POST UTME UNIBEN 2022 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'AA'?
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 2
Asexual reproduction in plants can occur through the process of
A. Budding
B. Fragmentation
C. Runners
D. Spores
Question 3
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 4
A 30-year-old woman presents with a 1-year history of recurrent miscarriages. Her thyroid function tests show a low TSH level. Which of the following is the most likely cause of her condition?
A. Thyroiditis
B. Graves' disease
C. Hashimoto's thyroiditis
D. Subclinical hypothyroidism
Question 5
Which of the following sense organs is responsible for detecting changes in blood pressure?
A. Baroreceptors in the carotid \sinus
B. Mechanoreceptors in the skin
C. Proprioceptors in the muscles
D. Chemoreceptors in the lungs
Question 6
The xylem is a type of vascular tissue found in plants that is responsible for transporting water and minerals from the roots to the leaves. Which of the following is a key feature of xylem tissue?
A. It is composed of dead cells
B. It is responsible for transporting sugars from the leaves to the roots
C. It is composed of living cells
D. It is responsible for transporting water and minerals from the roots to the leaves
Question 7
A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 0.05 per hour, what will be the population size after 5 hours?
A. 1000
B. 2000
C. 3000
D. 4000
Question 8
A 20-year-old male patient presents with a 2-year history of progressive hearing loss. His audiogram shows a flat bone conduction threshold with a steeply sloping air conduction threshold. Which of the following is the most likely diagnosis?
A. Sensorineural hearing loss
B. Conductive hearing loss
C. Mixed hearing loss
D. Otosclerosis
Question 9
In the context of osmoregulation, what is the primary function of the hormone vasopres\sin in the human body?
A. Regulation of blood pressure
B. Regulation of water reabsorption in the kidneys
C. Regulation of electrolyte balance
D. Regulation of blood sugar levels
Question 10
A diagram of the human \endocrine system is shown below. Which part of the \endocrine system is responsible for regulating blood sugar levels?
Question 11
In the context of evolutionary theory, what is the term for the process by which a population becomes reproductively isolated from other populations, leading to the formation of new species?
A. Speciation
B. Adaptation
C. Natural selection
D. Genetic drift
Question 12
The process of osmoregulation in animals involves the regulation of water and ion balance across cell membranes. Which of the following is a key mechanism involved in osmoregulation in the gut?
A. Active transport of ions across the intestinal epithelium
B. Passive diffusion of water across the intestinal epithelium
C. Excretion of excess ions in the feces
D. Reabsorption of glu\cose and amino acids in the intestinal epithelium
Question 13
A diagram of the human excretory system is shown below. Which part of the excretory system is responsible for filtering waste products from the blood?
A. Kidneys
B. Ureters
C. Bladder
D. Urethra
Question 14
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'rr'?
A. 0.25
B. 0.5
C. 0.75
D. 1
Question 15
In the context of asexual reproduction, what is the term for the process by which a \single cell divides to produce two daughter cells, each of which is genetically identical to the parent cell?
A. Mitosis
B. Meiosis
C. Binary fission
D. Budding

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