POST UTME LEAD CITY UNIVERSITY 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a population of 1000 individuals, 70% are heterozygous for the ABO blood group gene, 20% are homozygous dominant, and 10% are homozygous recessive. What is the genotype and phenotype of the individual represented by the genotype 'Aa'?
A. Genotype: Aa, Phenotype: AB blood group
B. Genotype: Aa, Phenotype: O blood group
C. Genotype: AA, Phenotype: AB blood group
D. Genotype: aa, Phenotype: O blood group
Question 2
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. 1.0
Question 3
In a typical terrestrial e\cosystem, what is the primary function of the xylem tissue in plants?
A. Transport of water and minerals from the roots to the leaves
B. Production of glu\cose through photosynthesis
C. Storage of nutrients and water in the stems
D. Regulation of temperature in the plant body
Question 4
What is the primary function of the xylem in plants?
A. To transport water and minerals from the roots to the leaves
B. To transport sugars and other organic compounds from the leaves to the roots
C. To regulate the plant's water potential
D. To synthesize chlorophyll from amino acids
Question 5
A patient is experiencing symptoms of dehydration. Which of the following is a common sign of dehydration?
A. Increased urine output
B. Decreased urine output
C. Dark-colored urine
D. All of the above
Question 6
A patient is diagnosed with a kidney stone. Which of the following is a common cause of kidney stones?
A. Dehydration
B. Genetic predisposition
C. Diet high in oxalate
D. All of the above
Question 7
A plant cell has a vacuole that contains 0.5 M sucrose. If 10 mL of the vacuolar sap is removed and diluted to 100 mL, what is the concentration of sucrose in the resulting solution?
A. 0.005 M
B. 0.01 M
C. 0.05 M
D. 0.1 M
Question 8
In a forest e\cosystem, the presence of a keystone species can have a cascading effect on the entire food chain. Which of the following best describes the role of a keystone species?
A. A species that is a primary consumer in the food chain.
B. A species that has a large population size and is a major predator.
C. A species that plays a unique role in the e\cosystem and has a disproportionate impact on the environment.
D. A species that is a secondary consumer in the food chain.
Question 9
A bio\logist observes that a certain species of plant has a unique ability to survive in a environment with high levels of salt. Which of the following best describes this phenomenon?
A. Halophytism
B. Hydrophily
C. Xerophytism
D. Cryophytism
Question 10
A population of rabbits is growing according to the \logistic growth model. The initial population size is 100, and the carrying capacity is 1000. If the growth rate is 0.2, what is the population size after 5 years?
A. 500
B. 750
C. 900
D. 950
Question 11
A bio\logist observes that a certain species of bird has a unique beak shape that allows it to feed on a specific type of food. Which of the following best describes this phenomenon?
A. Adaptation
B. Mutualism
C. Competition
D. Symbiosis
Question 12
A patient with a hormonal imbalance is experiencing symptoms of hyperthyroidism. Which of the following hormones is most likely responsible for this condition?
A. Thyroid-stimulating hormone (TSH)
B. Triiodothyronine (T3)
C. Thyroxine (T4)
D. Adrenaline
Question 13
In the context of hormonal coordination, what is the primary function of the hypothalamic-pituitary-adrenal (HPA) axis?
A. Regulation of body temperature
B. Maintenance of blood glu\cose levels
C. Response to stress and anxiety
D. Regulation of sleep-wake cycles
Question 14
A 50-year-old woman has a family history of breast cancer. Her mother and sister both had breast cancer at ages 45 and 38, respectively. What is the probability that she will develop breast cancer by age 60?
A. 0.1
B. 0.2
C. 0.3
D. 0.4
Question 15
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population size is 1000, what is the expected number of homozygous recessive individuals?
A. 80
B. 160
C. 200
D. 240

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