POST UTME LAUTECH 2019 Biology | Objective

Are you preparing for POST UTME LAUTECH exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2019 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1
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 pressure
C. Stimulation of the immune system
Correct D. Regulation of the stress response

Correct Answer: D

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Question 2
A diagram of the xylem and phloem tissues in a plant stem is shown below. What is the primary function of the xylem tissue?
A. Transport of sugars and amino acids
Correct B. Transport of water and minerals
C. Support and storage of the plant
D. Regulation of the plant's growth

Correct Answer: B

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Question 3
In the context of excretion and osmoregulation, what is the primary function of the kidneys?
A. Regulation of blood pressure
B. Maintenance of electrolyte balance
Correct C. Removal of waste products
D. Regulation of body temperature

Correct Answer: C

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Question 4
A diagram of the respiratory system is shown below. What is the primary function of the alveoli?
Correct A. Exchange of oxygen and carbon dioxide
B. Filtering of the blood
C. Production of mucus
D. Regulation of the respiratory rate

Correct Answer: A

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Question 5
In the context of evolutionary theories and adaptations, what is the primary mechanism of natural selection?
A. Genetic drift
B. Gene flow
C. Mutation
Correct D. Survival and reproduction of individuals with favorable traits

Correct Answer: D

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Question 6
A population of Drosophila melanogaster is being studied for its response to selection pressure. The initial population mean body length is 10 mm, with a s\tandard deviation of 1 mm. After 10 generations of selection for increased body length, the population mean body length has increased to 12 mm, with a s\tandard deviation of 0.8 mm. What is the selection differential (S) in mm?
A. 1.2
Correct B. 1.5
C. 1.8
D. 2.0

Correct Answer: B

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Question 7
A cell is placed in a solution containing 0.1 M glu\cose and 0.01 M fructose. The cell membrane is permeable to glu\cose but not to fructose. What is the concentration of glu\cose in the cell after 30 minutes?
A. 0.05 M
B. 0.075 M
Correct C. 0.1 M
D. 0.125 M

Correct Answer: C

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Question 8
A plant is placed in a controlled environment with a cons\tant temperature of 25°C and a relative humidity of 60%. The plant is watered with a solution containing 0.1 M glu\cose and 0.01 M fructose. What is the rate of photosynthesis \( in μmol CO2/s \) if the plant is illuminated with a light intensity of 200 μmol/m²s?
A. 2.5
Correct B. 5.0
C. 7.5
D. 10.0

Correct Answer: B

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Question 9
A 2.0 L solution contains 0.1 M glu\cose and 0.01 M fructose. What is the concentration of glu\cose in the solution after 10 minutes if the solution is stirred at a rate of 100 rpm?
A. 0.05 M
B. 0.075 M
Correct C. 0.1 M
D. 0.125 M

Correct Answer: C

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Question 10
A population of E. coli is being studied for its response to antibiotics. The initial population size is 10^6 cells, with a growth rate of 0.5/h. After 2 hours of exposure to the antibiotic, the population size has decreased to 10^4 cells. What is the rate of death \( in 1/h \) if the population size is assumed to follow an exponential decay model?
A. 0.05
Correct B. 0.1
C. 0.15
D. 0.2

Correct Answer: B

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Question 11
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'?
Correct A. 0.36
B. 0.64
C. 0.72
D. 0.84

Correct Answer: A

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Question 12
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. 1/4
Correct B. 1/2
C. 3/4
D. 1

Correct Answer: B

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Question 13
A diagram of the human nervous system is shown below. Which part of the brain is responsible for controlling voluntary movements?
Correct A. Cerebrum
B. Cerebellum
C. Brainstem
D. Spinal Cord

Correct Answer: A

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Question 14
A diagram of the human digestive system is shown below. Which part of the digestive system is responsible for absorbing nutrients from food?
A. Mouth
B. Esophagus
C. Stomach
Correct D. Small Intestine

Correct Answer: D

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Question 15
A diagram of the human nervous system is shown below. Which part of the nervous system is responsible for controlling involuntary movements?
A. Somatic Nervous System
Correct B. Autonomic Nervous System
C. Central Nervous System
D. Peripheral Nervous System

Correct Answer: B

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Question 16
In the context of evolutionary theory, what is the primary mechanism by which genetic drift leads to the loss of genetic variation in a population?
A. Genetic mutation
B. Gene flow
Correct C. Genetic drift
D. Natural selection

Correct Answer: C

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Question 17
A researcher is studying the effects of habitat fragmentation on population dynamics in a forest e\cosystem. Which of the following is a likely consequence of habitat fragmentation?
A. Increased population size
Correct B. Decreased population size
C. No effect on population size
D. Increased genetic diversity

Correct Answer: B

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Question 18
A patient is diagnosed with a rare genetic disorder that affects the production of a specific hormone. Which of the following is a likely consequence of this disorder?
Correct A. Increased risk of cancer
B. Decreased risk of cancer
C. Increased risk of cardiovascular disease
D. Decreased risk of cardiovascular disease

Correct Answer: A

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Question 19
A researcher is studying the effects of climate change on the distribution of a specific plant species. Which of the following is a likely consequence of climate change on this species?
A. Increased distribution range
Correct B. Decreased distribution range
C. No effect on distribution range
D. Increased population size

Correct Answer: B

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Question 20
A patient is diagnosed with a genetic disorder that affects the production of a specific enzyme. Which of the following is a likely consequence of this disorder?
Correct A. Increased risk of cancer
B. Decreased risk of cancer
C. Increased risk of cardiovascular disease
D. Decreased risk of cardiovascular disease

Correct Answer: A

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Question 21
In a population of 1000 individuals, the frequency of the dominant allele is 0.6 and the frequency of the recessive allele is 0.4. What is the expected frequency of the heterozygous genotype?
A. 0.24
Correct B. 0.36
C. 0.48
D. 0.60

Correct Answer: B

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Question 22
A plant cell has a cell wall, a large central vacuole, and a small nucleus. What is the primary function of the cell wall?
Correct A. Support and protection
B. Storage of nutrients
C. Regulation of cell growth
D. Transport of subs\tances

Correct Answer: A

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Question 23
A microorganism is isolated from a patient and identified as Staphylococcus aureus. What is the primary mode of transmission of this microorganism?
A. Airborne transmission
Correct B. Contact transmission
C. Vector-borne transmission
D. Waterborne transmission

Correct Answer: B

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Question 24
A diagram of the human eye is shown below. What is the function of the lens?
Correct A. To focus light on the retina
B. To detect light intensity
C. To regulate pupil size
D. To produce tears

Correct Answer: A

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Question 25
A diagram of a cell membrane is shown below. What is the primary function of the cell membrane?
A. To regulate cell growth
B. To store nutrients
Correct C. To transport subs\tances
D. To provide structural support

Correct Answer: C

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