POST UTME LEAD CITY UNIVERSITY 2021 Biology | Objective

Are you preparing for POST UTME LEAD CITY UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2021 Biology (Objective) questions designed to simulate the real exam environment.

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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 is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'AA'?
Correct A. 0.64
B. 0.36
C. 0.16
D. 0.04

Correct Answer: A

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Question 2
A plant with a mutation in the Xylem sap transport system shows a reduction in water transport. Which of the following is a likely consequence of this mutation?
A. Increased water loss through transpiration
Correct B. Reduced water transport to the leaves
C. Increased water uptake from the roots
D. No effect on water transport

Correct Answer: B

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Question 3
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)
Correct C. Thyroxine (T4)
D. Adrenaline

Correct Answer: C

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Question 4
A tissue sample from a patient shows a high concentration of fibroblasts. Which of the following tissues is most likely affected?
Correct A. Connective tissue
B. Muscle tissue
C. Nervous tissue
D. Epithelial tissue

Correct Answer: A

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Question 5
A patient with a genetic disorder is experiencing symptoms of anemia. Which of the following genes is most likely responsible for this condition?
Correct A. Hemoglobin gene (HBB)
B. Folate receptor gene (FOLR1)
C. Vitamin B12 receptor gene (TCBLR)
D. Iron transporter gene (SLC40A1)

Correct Answer: A

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Question 6
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'?
Correct 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

Correct Answer: A

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Question 7
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'?
Correct A. 1/4
B. 1/2
C. 3/4
D. 1

Correct Answer: A

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Question 8
A diagram shows a plant with a long stem and a short root. The plant is placed in a pot with a mixture of soil and sand. What is the most likely effect on the plant's growth?
A. The plant will grow faster
Correct B. The plant will grow slower
C. The plant will not grow
D. The plant will die

Correct Answer: B

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Question 9
A diagram shows a human heart with a blood vessel labeled 'Aorta'. What is the function of the aorta?
A. To pump blood to the lungs
B. To pump blood to the brain
Correct C. To pump blood to the rest of the body
D. To pump blood to the liver

Correct Answer: C

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Question 10
A diagram shows a human kidney with a blood vessel labeled 'Renal Artery'. What is the function of the renal artery?
A. To pump blood to the liver
B. To pump blood to the lungs
C. To pump blood to the brain
Correct D. To pump blood to the rest of the body

Correct Answer: D

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Question 11
In a population of 1000 individuals, 70% have the dominant allele for brown eyes. If 20 individuals are randomly selected, what is the probability that at least 15 of them will have brown eyes?
A. 0.25
Correct B. 0.30
C. 0.35
D. 0.40

Correct Answer: B

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Question 12
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
Correct B. 0.01 M
C. 0.05 M
D. 0.1 M

Correct Answer: B

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Question 13
A 2.5 L flask contains 1.5 mol of O2 at 25°C. If 0.5 mol of O2 is removed, what is the new partial pressure of O2?
A. 0.5 atm
Correct B. 1.0 atm
C. 1.5 atm
D. 2.0 atm

Correct Answer: B

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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
Correct D. 0.4

Correct Answer: D

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Question 15
A 10-year-old boy has a fever of 38.5°C. His white blood cell count is 15,000 cells/μL. What is the most likely diagnosis?
A. Viral pneumonia
Correct B. Bacterial pneumonia
C. Leukemia
D. Lymphoma

Correct Answer: B

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Question 16
In the process of cellular respiration, what is the primary function of the mitochondria?
Correct A. To synthesize ATP from glu\cose
B. To break down glu\cose into carbon dioxide and water
C. To regulate the cell's pH levels
D. To synthesize proteins from amino acids

Correct Answer: A

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Question 17
Which of the following hormones is responsible for stimulating the breakdown of glycogen to glu\cose in the liver?
Correct A. Glucagon
B. Insulin
C. Adrenaline
D. Thyroxine

Correct Answer: A

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Question 18
What is the primary function of the xylem in plants?
Correct 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

Correct Answer: A

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Question 19
Which of the following types of classification is based on the structure and organization of living organisms?
A. Phy\logenetic classification
Correct B. Morpho\logical classification
C. Biogeographical classification
D. Eco\logical classification

Correct Answer: B

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Question 20
What is the primary function of the roots in plants?
A. To synthesize chlorophyll from amino acids
B. To regulate the plant's water potential
Correct C. To transport water and minerals from the soil to the leaves
D. To synthesize proteins from amino acids

Correct Answer: C

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Question 21
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
Correct C. Response to stress and anxiety
D. Regulation of sleep-wake cycles

Correct Answer: C

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Question 22
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
Correct D. All of the above

Correct Answer: D

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Question 23
A researcher is studying the effect of antibiotics on bacterial growth. Which of the following is a characteristic of antibiotic resis\tance?
A. Increased bacterial growth rate
B. Decreased bacterial growth rate
Correct C. Ability of bacteria to produce enzymes that inactivate antibiotics
D. Ability of bacteria to develop a thick cell wall

Correct Answer: C

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Question 24
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
Correct D. All of the above

Correct Answer: D

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Question 25
A researcher is studying the structure of a plant cell. Which of the following is a characteristic of the cell wall?
A. It is composed of cellulose
B. It is composed of pectin
Correct C. It is composed of both cellulose and pectin
D. It is composed of proteins

Correct Answer: C

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