POST UTME LASU 2017 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A plant cell has a volume of 100 μm^3. If the cell membrane has a surface area of 50 μm^2, what is the surface-to-volume ratio?
A. 1:2
B. 1:5
C. 1:10
D. 1:50
Question 2
A plant's xylem is responsible for transporting what subs\tance from the roots to the leaves?
A. Water and minerals
B. Sugars and amino acids
C. Hormones and vitamins
D. Gases and ions
Question 3
A cell undergoing mitosis has a nucleus with 4 pairs of sister chromatids. How many chromosomes will be present in each daughter cell after mitosis?
A. 8
B. 16
C. 32
D. 64
Question 4
In a typical xylem vessel, what is the primary function of the lignin component?
A. To provide structural support to the vessel
B. To facilitate the transport of water and minerals
C. To regulate the rate of transpiration
D. To protect the vessel from pathogens
Question 5
A diagram of the human eye is shown below. Which of the following statements is true regarding the structure of the eye?
A. The cornea is the transparent part of the eye
B. The iris is the colored part of the eye
C. The lens is the part of the eye that changes shape to focus light
D. The retina is the part of the eye that detects light
Question 6
In the process of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
B. To produce NADH and FADH2
C. To pump protons across the mitochondrial membrane
D. To reduce oxygen to water
Question 7
A cell has a membrane potential of -70 mV. If the cell is stimulated with a 10 mV depolarizing current, what is the new membrane potential?
A. -60 mV
B. -65 mV
C. -70 mV
D. -75 mV
Question 8
A 5% solution of glu\cose in water has a density of 1.05 g/mL. What is the concentration of glu\cose in moles per liter?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 9
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 dominant allele 'A'?
A. 0.8
B. 0.6
C. 0.4
D. 0.2
Question 10
A plant is placed in a greenhouse with a temperature of 25°C. What is the rate of respiration of this plant?
A. 2.0 x 10^-5 mol CO2/min
B. 2.0 x 10^-6 mol CO2/min
C. 2.0 x 10^-7 mol CO2/min
D. 2.0 x 10^-8 mol CO2/min
Question 11
A 2-year-old child has a hemoglobin level of 10 g/dL. What is the percentage of the child's expected hemoglobin level?
A. 50%
B. 60%
C. 70%
D. 80%
Question 12
A plant has a root system with a total surface area of 100 cm^2. If the root system is 50% efficient in absorbing water, what is the maximum amount of water that can be absorbed?
A. 25 cm^3
B. 50 cm^3
C. 75 cm^3
D. 100 cm^3
Question 13
The process of mitosis results in what type of cell division?
A. Meiosis
B. Mitosis
C. Binary fission
D. Endoreduplication
Question 14
In the context of the classification of living things, which of the following is an example of a characteristic that distinguishes between prokaryotic and eukaryotic cells?
A. Presence of a true nucleus
B. Presence of mitochondria
C. Presence of a cell wall
D. Presence of ribosomes
Question 15
A plant with the genotype 'Tt' is crossed with a plant with the genotype 'tt'. What is the probability that the offspring will be tall?
A. 0.5
B. 0.75
C. 0.25
D. 0.33

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