POST UTME GREENFIELD UNIVERSITY 2018 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The sense organ responsible for detecting changes in light intensity is the?
A. Eye
B. Ear
C. Nose
D. Mouth
Question 2
A species of fish has a unique adaptation that allows it to survive in low-oxygen environments. Which of the following physio\logical changes would most likely be responsible for this adaptation?
A. Increased myoglobin levels to store oxygen
B. Increased hemoglobin levels to increase oxygen-carrying capacity
C. Increased mitochondrial density to increase energy production
D. Increased anaerobic metabolism to produce energy without oxygen
Question 3
A diagram shows a simple harmonic motion of a mass-spring system. The amplitude of the motion is 5 cm, and the angular frequency is 2 rad/s. What is the maximum velocity of the mass?
A. 10 cm/s
B. 20 cm/s
C. 5 cm/s
D. 2 cm/s
Question 4
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. 0.6
B. 0.4
C. 0.8
D. 0.2
Question 5
A species of plant has a unique adaptation that allows it to survive in environments with high levels of salt. Which of the following physio\logical changes would most likely be responsible for this adaptation?
A. Increased salt excretion through the roots
B. Increased salt storage in the leaves
C. Increased salt tolerance through the use of specialized enzymes
D. Increased salt avoidance through the use of specialized roots
Question 6
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. 0.3
B. 0.4
C. 0.5
D. 0.6
Question 7
A diagram of the human nervous system is shown below. Identify the part labeled B.
A. Brain
B. Spinal cord
C. Cerebellum
D. Medulla oblongata
Question 8
A plant with the genotype 'AaBb' is crossed with a plant with the genotype 'AaBb'. What is the probability that the offspring will have the genotype 'AABB'?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 9
A 25-year-old athlete is experiencing muscle cramps and weakness. Which of the following is a possible cause?
A. Dehydration due to inadequate fluid intake
B. Electrolyte imbalance due to excessive sweating
C. Muscle fatigue due to overtraining
D. Infection due to bacterial contamination
Question 10
A species of bird has a unique mating ritual where the male bird builds an elaborate nest and performs a complex courtship dance to attract a female. Which of the following evolutionary pressures would most likely lead to the development of this mating ritual?
A. Predation pressure leading to increased competition for mates
B. Resource scarcity leading to increased competition for mates
C. Genetic drift leading to random changes in mating behavior
D. Sexual selection leading to increased competition for mates
Question 11
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 12
A diagram of the human respiratory system is shown below. What is the function of the part labeled 'E'?
A. To filter the air.
B. To warm the air.
C. To exchange gases.
D. To expand and contract during breathing.
Question 13
A researcher is studying the effect of temperature on the rate of respiration in plants. Which of the following is a correct statement about the relationship between temperature and respiration rate?
A. Respiration rate increases with increa\sing temperature.
B. Respiration rate decreases with increa\sing temperature.
C. Respiration rate remains cons\tant with increa\sing temperature.
D. Respiration rate increases up to a certain temperature and then decreases.
Question 14
A diagram of the human excretory system is shown below.
A. The kidneys are organs that filter waste from the blood.
B. The ureters are tubes that connect the kidneys to the bladder.
C. The bladder is an organ that stores urine.
D. The kidneys are organs that produce urine.
Question 15
A researcher is studying the population dynamics of a species of rabbit. The population growth rate is modeled by the \logistic equation dP/dt = rP\( 1-P/K \), where P is the population size, r is the intrinsic growth rate, and K is the carrying capacity. What is the value of P when the population growth rate is zero?
A. K/2
B. K
C. 2K
D. 0

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