POST UTME CRAWFORD UNIVERSITY 2024 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.0 L solution of 0.5 M NaOH is prepared by dissolving 1.0 g of NaOH in 1000 mL of water. What is the concentration of the solution in molarity?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M
Question 2
A researcher is studying the effect of antibiotics on the growth of a microorganism. The researcher observes that the microorganism grows slowly in the presence of antibiotics. What is the most likely reason for this phenomenon?
A. The microorganism is sensitive to antibiotics.
B. The microorganism is resis\tant to antibiotics.
C. The microorganism is sensitive to pH.
D. The microorganism is sensitive to temperature.
Question 3
A bacterium is placed in a nutrient-rich environment and allowed to grow. After 2 hours, the population has increased by a factor of 8. If the initial population was 1000 cells, what is the population after 4 hours?
A. 16000
B. 32000
C. 64000
D. 128000
Question 4
The diagram below shows a cross-section of the human eye. What is the function of the structure labeled 'C'?
A. To focus light onto the retina
B. To regulate the amount of light entering the eye
C. To detect changes in light intensity
D. To produce tears to lubricate the eye
Question 5
A plant grows from a seedling to a mature plant in 5 years. If it grows 2.5 cm in the first year, 5.0 cm in the second year, 7.5 cm in the third year, 10.0 cm in the fourth year, and 12.5 cm in the fifth year, what is the average annual growth rate?
A. 25%
B. 30%
C. 35%
D. 40%
Question 6
A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 1000 mL of water. What is the concentration of the solution in molarity?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 7
A bio\logist is studying the effect of temperature on the growth of a microorganism. She measures the growth rate of the microorganism at different temperatures and plots the data on a graph. Which of the following types of graphs would best represent the relationship between temperature and growth rate?
A. \( y = \frac{1}{1 + e^{-x}} \)
B. \( y = e^x \)
C. \( y = \log\( x \ \))
D. \( y = x^2 \)
Question 8
A geneticist is studying the inheri\tance of a trait in a population of pea plants. The trait is controlled by a \single gene with two alleles, one dominant and one recessive. If the genotype of the parent plant is 'Bb', what is the probability that the offspring will be homozygous recessive?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 9
The process by which an organism's genetic information is passed from one generation to the next is known as?
A. Mutation
B. Genetic drift
C. Natural selection
D. Heritability
Question 10
A cell is placed in a solution with a concentration of 0.1 M glu\cose. The cell is able to transport glu\cose into the cell u\sing facilitated diffusion. What is the concentration of glu\cose in the cell after 10 minutes?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 11
The diagram below shows a cross-section of a xylem vessel. What is the function of the lignified cells labeled 'A'?
A. To provide structural support to the xylem vessel
B. To transport water and minerals from the roots to the leaves
C. To store food and nutrients in the xylem vessel
D. To regulate the rate of transpiration in the xylem vessel
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. 0.36
B. 0.64
C. 0.72
D. 0.84
Question 13
The process by which plants release water vapor into the air is known as?
A. Transpiration
B. Respiration
C. Photosynthesis
D. Evaporation
Question 14
The diagram below shows the structure of a plant cell. What is the function of the 'plastid' labeled 'A'?
A. Photosynthesis
B. Respiration
C. Storage of nutrients
D. Support and structure
Question 15
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'Rr'?
A. 0.5
B. 0.25
C. 0.75
D. 0.33

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: