POST UTME ABU 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In the context of hormonal coordination, what is the primary function of the hypothalamic-pituitary-adrenal (HPA) axis?
A. Regulation of body temperature
B. Maintenance of homeostasis
C. Stimulation of reproductive processes
D. Modulation of immune responses
Question 2
A plant grows in a controlled environment with a cons\tant temperature and light intensity. However, the plant's growth rate slows down over time. What is the most likely explanation for this phenomenon?
A. The plant has reached its maximum growth potential
B. The plant is experiencing resource limitation
C. The plant is experiencing genetic drift
D. The plant is experiencing epigenetic modification
Question 3
A certain e\cosystem has a population of 1000 individuals, with 20% of the population being herbivores, 30% being carnivores, and 50% being decomposers. If the e\cosystem is disturbed, what is the expected change in the population size of the herbivores?
A. -20%
B. -30%
C. -40%
D. -50%
Question 4
In the context of osmoregulation, what is the primary function of the kidneys in maintaining electrolyte balance?
A. To regulate the amount of water in the body
B. To maintain the balance of electrolytes in the body
C. To remove waste products from the body
D. To regulate body temperature
Question 5
A 5% solution of glu\cose in water is prepared by dissolving 5g of glu\cose in 95g of water. What is the concentration of the solution in g/100g?
A. 5g/100g
B. 10g/100g
C. 15g/100g
D. 20g/100g
Question 6
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 7
A patient is diagnosed with a bacterial infection caused by Escherichia coli (E. coli). Which of the following antibiotics is most likely to be effective against this infection?
A. Penicillin
B. Ciprofloxacin
C. Vancomycin
D. Amoxicillin
Question 8
In a typical human cell, the mitochondria are responsible for producing which type of energy?
A. ATP
B. NADH
C. FADH2
D. GTP
Question 9
A species of insect is classified as belonging to the kingdom Animalia, phylum Arthropoda, class Insecta, order Coleoptera, family Carabidae, genus Carabus, and species C. auronitens. What is the taxonomic rank of the species C. auronitens?
A. Kingdom
B. Phylum
C. Class
D. Species
Question 10
A diagram of a plant cell is shown below. What is the function of the cell wall?
A. Regulation of cell growth
B. Maintenance of cell shape
C. Protection against pathogens
D. Transport of nutrients
Question 11
A certain species of bacteria grows according to the equation \(N = N_0e^{kt}\), where \(N\) is the population size at time \(t\), \(N_0\) is the initial population size, and \(k\) is the growth rate. If the population size doubles in 5 hours, what is the growth rate?
A. 0.14 h^{-1}
B. 0.14 h^{-1}
C. 0.14 h^{-1}
D. 0.14 h^{-1}
Question 12
In a population of 1000 individuals, 70% are heterozygous for a particular gene. What is the expected frequency of the recessive allele in the population?
A. 0.05
B. 0.10
C. 0.15
D. 0.20
Question 13
A plant grows in a pot with a mixture of soil and sand. If the plant is watered with a solution containing a high concentration of salt, what will happen to the plant's growth?
A. The plant will grow faster
B. The plant will grow normally
C. The plant will grow slower
D. The plant will die
Question 14
A microorganism is isolated from a patient with a severe infection. The microorganism is found to be resis\tant to multiple antibiotics. What is the most likely explanation for this resis\tance?
A. The microorganism has a mutation in its DNA that confers resis\tance
B. The microorganism has acquired a plasmid that encodes resis\tance genes
C. The microorganism has developed a biofilm that protects it from antibiotics
D. The microorganism has been exposed to sub-lethal concentrations of antibiotics
Question 15
In a photosynthetic reaction, what is the net result of the conversion of light energy to chemical energy?
A. The production of glu\cose and oxygen
B. The production of glu\cose and carbon dioxide
C. The production of oxygen and water
D. The production of glu\cose and water

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