POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A certain species of bacteria grows according to the equation N(t) = N0e^(kt), where N(t) is the population at time t, N0 is the initial population, and k is the growth rate. If the initial population is 1000 and the population doubles in 2 hours, what is the growth rate?
A. 0.10/h
B. 0.20/h
C. 0.30/h
D. 0.40/h
Question 2
A certain species of plant grows according to the equation L(t) = L0\( 1 + rt \), where L(t) is the length at time t, L0 is the initial length, and r is the growth rate. If the initial length is 10 cm and the length increases by 20% in 2 years, what is the growth rate?
A. 0.05/yr
B. 0.10/yr
C. 0.15/yr
D. 0.20/yr
Question 3
A plant with the genotype 'Tt' is crossed with a plant with the genotype 'tt'. What is the probability that the offspring will have the genotype 'TT'?
A. 0.25
B. 0.5
C. 0.75
D. 1
Question 4
In the process of osmoregulation, what is the primary mechanism by which the kidneys regulate the concentration of ions in the blood?
A. Reabsorption of ions in the proximal convoluted tubule
B. Secretion of ions in the distal convoluted tubule
C. Regulation of ion channels in the collecting duct
D. Excretion of ions in the urine
Question 5
A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. If 0.5 mol of the gas is removed, what is the new pressure of the gas?
A. 2.5 atm
B. 3.5 atm
C. 4.5 atm
D. 5.5 atm
Question 6
What is the term for the process by which an organism's genetic information is passed from one generation to the next?
A. Mutation
B. Genetic drift
C. Gene flow
D. Heritability
Question 7
A plant grows in a nutrient-poor soil. Which of the following is a likely adaptation of the plant?
A. Deep roots to access water and nutrients
B. Large leaves to increase photosynthesis
C. Small leaves to reduce transpiration
D. Thorns to protect from herbivores
Question 8
What is the term for the process by which an organism's genetic information is passed from one generation to the next?
A. Mutation
B. Genetic drift
C. Gene flow
D. Heritability
Question 9
What is the term for the process by which an organism's genetic information is altered by external factors?
A. Mutation
B. Genetic drift
C. Gene flow
D. Epigenetics
Question 10
Asexual reproduction in bacteria is an example of what type of reproduction?
A. Binary Fission
B. Mitosis
C. Meiosis
D. Photosynthesis
Question 11
A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.25 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, calculate the maximum speed of the block.
A. 0.25 m/s
B. 0.50 m/s
C. 0.75 m/s
D. 1.00 m/s
Question 12
In the process of reproduction, what is the term for the fusion of male and female gametes to form a zygote?
A. Fertilization
B. Meiosis
C. Mitosis
D. Syngamy
Question 13
A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 0.2 per hour, what is the population size after 2 hours?
A. 200
B. 400
C. 600
D. 800
Question 14
A diagram of a plant root system is shown below. What is the function of the xylem in this system?
A. To transport water and minerals from the roots to the leaves
B. To transport glu\cose from the leaves to the roots
C. To produce ATP in the mitochondria
D. To synthesize proteins in the ribosomes
Question 15
In the xylem, what is the primary mechanism by which water and minerals are transported from the roots to the leaves?
A. Transpiration pull
B. Root pressure
C. Capillary action
D. Osmosis

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