POST UTME UNN 2024 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of glu\cose. Which of the following is NOT a byproduct of photosynthesis?
A. Oxygen
B. Carbon dioxide
C. Nitrogen
D. Water
Question 2
A study on the genetic variation of a population found that the frequency of the dominant allele (A) is 0.6, and the frequency of the recessive allele (a) is 0.4. What is the expected frequency of the heterozygous genotype (Aa) in the population?
A. 0.24
B. 0.36
C. 0.48
D. 0.60
Question 3
A plant has a photosynthetic rate of 10 μmol CO2 s-1. If the light intensity is increased by a factor of 4, what is the new photosynthetic rate?
A. 20 μmol CO2 s-1
B. 40 μmol CO2 s-1
C. 60 μmol CO2 s-1
D. 80 μmol CO2 s-1
Question 4
A population of rabbits is growing exponentially. If the initial population is 100 and the growth rate is 20% per year, what will be the population after 5 years?
A. 1000
B. 2000
C. 4000
D. 8000
Question 5
The theory of evolution by natural selection was first proposed by Charles Darwin. Which of the following is a key component of this theory?
A. Survival of the fittest
B. Mutation
C. Genetic drift
D. Gene flow
Question 6
A population of bacteria is growing exponentially according to the equation ( N(t) = N_0 e^{kt} ), where \( N_0 \) is the initial population, ( k ) is the growth rate, and ( t ) is time in hours. If the population doubles every 2 hours, what is the value of ( k )?
A. 0.173
B. 0.346
C. 0.693
D. 1.386
Question 7
A researcher is studying the effect of pH on the growth of E. coli. The researcher measures the growth rate of E. coli at different pH levels and plots the data on a graph. Which of the following best describes the relationship between pH and growth rate?
A. Directly proportional
B. Inversely proportional
C. No relationship
D. U-shaped curve
Question 8
A plant has a stomatal density of 100 stomata cm-2. If the stomatal index is 0.5, what is the total leaf area?
A. 200 cm2
B. 400 cm2
C. 600 cm2
D. 800 cm2
Question 9
A diagram shows a cross-section of a plant root. Which of the following structures is responsible for the absorption of water and minerals from the soil?
A. A
B. B
C. C
D. Both A and B
Question 10
In a population of 1000 individuals, 70% have the dominant allele for brown eye color (B) and 30% have the recessive allele (b). If two individuals are randomly selected, what is the probability that they will both have brown eye color?
A. 0.49
B. 0.51
C. 0.67
D. 0.75
Question 11
A neuron has a resting membrane potential of -70 mV. If the membrane potential is depolarized by 10 mV, what is the new membrane potential?
A. -60 mV
B. -50 mV
C. -40 mV
D. -30 mV
Question 12
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. 0.64
B. 0.36
C. 0.16
D. 0.04
Question 13
A neuron in the visual pathway of the eye is stimulated by light. What type of sensory receptor is responsible for this stimulation?
A. Photoreceptor
B. Pacinian corpuscle
C. Ruffini's corpuscle
D. Merkel's disc
Question 14
A diagram of a plant's vascular system is shown below. What is the function of the xylem vessels?
A. Transport of water and minerals
B. Transport of sugars and amino acids
C. Storage of starch and proteins
D. Synthesis of ATP
Question 15
The human body has a unique system that helps to maintain homeostasis. Which of the following is NOT a function of the \endocrine system?
A. Regulation of blood sugar levels
B. Regulation of body temperature
C. Production of red blood cells
D. Regulation of blood pressure

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