POST UTME COVENANT UNIVERSITY 2024 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A study on the genetic variation of a population found that the frequency of the recessive allele 'a' is 0.2. If the population size is 1000 and the Hardy-Weinberg principle holds, what is the expected frequency of the homozygous recessive genotype 'aa'?
A. 0.04
B. 0.08
C. 0.16
D. 0.32
Question 2
In the context of excretion and osmoregulation, what is the primary function of the kidneys in maintaining electrolyte balance?
A. Regulation of blood pH
B. Maintenance of electrolyte balance
C. Removal of waste products
D. Production of hormones
Question 3
In a plant cell, the vacuole is responsible for storing water and maintaining the cell's turgor pressure. What is the primary function of the vacuole in the cell?
A. Storing water and maintaining turgor pressure
B. Regulating cell growth and division
C. Producing energy for the cell
D. Removing waste products from the cell
Question 4
The process by which plants convert light energy into chemical energy is known as
A. Photosynthesis
B. Respiration
C. Transpiration
D. Osmosis
Question 5
A 100-g sample of a mixture of NaCl and KCl is dissolved in water and the resulting solution is electrolyzed. The mass of Cl2 gas collected is 25 g. What is the mass of NaCl in the original mixture?
A. 50 g
B. 75 g
C. 90 g
D. 95 g
Question 6
In a population of 1000 individuals, 70% are heterozygous for the gene controlling flower color, 20% are homozygous dominant, and 10% are homozygous recessive. What is the genotype and phenotype of the individual represented by the Punnett square below?
A. Genotype: BB, Phenotype: Red flowers
B. Genotype: Bb, Phenotype: Red flowers
C. Genotype: bb, Phenotype: White flowers
D. Genotype: Bb, Phenotype: White flowers
Question 7
A 0.5 M solution of NaCl is prepared by dissolving 28.35 g of NaCl in 1 L of water. What is the concentration of the solution in mol/L?
A. 0.25
B. 0.5
C. 0.75
D. 1
Question 8
A 2.5 L solution of 0.5 M NaCl is diluted to 5 L. What is the new concentration of NaCl in the solution?
A. 0.1 M
B. 0.2 M
C. 0.25 M
D. 0.5 M
Question 9
Which of the following transport systems in plants is responsible for the movement of water and minerals from the roots to the leaves?
A. Xylem
B. Phloem
C. Circulatory system
D. Nervous system
Question 10
A 5-L flask contains a mixture of N2 and O2 at 25°C and 1 atm. The partial pressure of O2 is 0.5 atm. What is the mole \fraction of O2?
A. 0.1
B. 0.2
C. 0.3
D. 0.4
Question 11
In the context of cell division, what is the primary function of the spindle fibers?
A. To separate chromosomes during mitosis
B. To synthesize DNA during interphase
C. To break down proteins during apoptosis
D. To repair damaged DNA during interphase
Question 12
A 1.5 L flask contains 0.3 mol of an ideal gas at 37°C. What is the pressure of the gas?
A. 100000
B. 101325
C. 102650
D. 103975
Question 13
The diagram below shows a cross-section of a plant root. What is the function of the part labeled A?
A. To anchor the plant in the soil
B. To absorb water and minerals from the soil
C. To produce hormones that regulate plant growth
D. To store food for the plant
Question 14
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. What is the pressure of the gas?
A. 100000
B. 101325
C. 102650
D. 103975
Question 15
A 0.5-L solution of a weak acid HA has a pH of 4.3. What is the concentration of the acid?
A. 0.01 M
B. 0.05 M
C. 0.1 M
D. 0.5 M

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