POST UTME GREENFIELD UNIVERSITY 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
The human eye has a unique structure that allows it to detect a wide range of light intensities. Which of the following statements best describes the role of the pupil in this process?
A. The pupil is responsible for focu\sing light onto the retina.
B. The pupil regulates the amount of light entering the eye, allowing the eye to adapt to changing light conditions.
C. The pupil is involved in the production of tears, which help to lubricate the eye.
D. The pupil is responsible for the movement of the eye, allowing it to track objects.
Question 3
A patient is suffering from a kidney disorder that affects the excretion of waste products. Which of the following organs would be primarily responsible for compensating for the loss of kidney function?
A. Liver
B. Lungs
C. Skin
D. Intestines
Question 4
A 2.0 M solution of HCl is mixed with a 2.0 M solution of NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 5
A woman has a genetic disorder that affects her ability to digest lactose. She has two children, one of whom is lactose intolerant. What is the probability that her next child will be lactose intolerant?
A. 1/2
B. 1/4
C. 3/4
D. 1/3
Question 6
A researcher is studying the effect of temperature on the rate of photosynthesis in a plant. The rate of photosynthesis is measured in units of CO2 uptake per hour. The data collected is as follows: Temperature (°C) 20 25 30 35 40 Rate of photosynthesis \( CO2 uptake/h \) 10 20 30 40 50
A. Directly proportional
B. Inversely proportional
C. No relationship
D. Quadratically related
Question 7
The process by which an organism's cells become specialized to perform specific functions is called what?
A. Mitosis
B. Meiosis
C. Differentiation
D. Genetic drift
Question 8
A solution of 0.1 M glu\cose is diluted to 0.01 M. What is the ratio of the initial volume to the final volume?
A. 1:10
B. 1:100
C. 10:1
D. 100:1
Question 9
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. 0.9
Question 10
A 25-year-old woman presents with a 2-year history of amenorrhea. Her serum FSH level is elevated, and her pelvic examination is normal. What is the most likely diagnosis?
A. Premature ovarian failure
B. Polycystic ovary syndrome
C. Hypothalamic amenorrhea
D. Pituitary tumor
Question 11
In a population of E. coli, the frequency of the gene for ampicillin resis\tance is 0.2. If 1000 bacteria are plated on agar containing ampicillin, how many are expected to be resis\tant?
A. 0
B. 2
C. 200
D. 2000
Question 12
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype?
A. 0.36
B. 0.64
C. 0.16
D. 0.04
Question 13
A plant cell has a vacuole that is 10 μm in diameter. If the cell membrane is 1 μm thick, what is the total dis\tance across the cell membrane and the vacuole?
A. 12 μm
B. 14 μm
C. 16 μm
D. 18 μm
Question 14
A 40-year-old man presents with a 5-year history of hypertension. His serum creatinine level is elevated, and his pelvic examination is normal. What is the most likely diagnosis?
A. Chronic kidney disease
B. Diabetes mellitus
C. Hypertensive heart disease
D. Pulmonary hypertension
Question 15
The diagram below shows a simple food chain. What is the term for the energy that is transferred from one trophic level to the next?
A. Energy transfer
B. Nutrient cycling
C. Decomposition
D. Trophic efficiency

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