POST UTME NILE UNIVERSITY 2017 Biology | Objective

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Question 1
The process of digestion in the small intestine involves the breakdown of proteins into
A. sugars and amino acids
B. fats and carbohydrates
C. proteins and nucleic acids
D. glycogen and starch
Question 2
Asexual reproduction in plants can occur through what method?
A. Budding
B. Fragmentation
C. Runners
D. Spores
Question 3
The process of excretion in animals involves the removal of waste products from the body. Which of the following is a primary function of the kidneys in the excretory system?
A. To regulate body temperature
B. To remove waste products from the blood
C. To produce hormones that control growth and development
D. To maintain proper pH levels in the body
Question 4
In the context of eco\logical succession, what is the primary mechanism driving the shift from a pioneer community to a climax community?
A. Competition for resources
B. Predation and herbivory
C. Mutualism and symbiotic relationships
D. Nutrient cycling and decomposition
Question 5
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 x 10^5 Pa
B. 2.02 x 10^5 Pa
C. 3.03 x 10^5 Pa
D. 4.04 x 10^5 Pa
Question 6
A 10 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 5 mL of NaOH has been added?
A. 2
B. 3
C. 4
D. 5
Question 7
Which of the following is an example of a hormone that regulates growth and development in humans?
A. Insulin
B. Growth Hormone
C. Adrenaline
D. Thyroxine
Question 8
A researcher is studying the growth and development of a plant. Which of the following is the primary mechanism by which auxins promote cell elongation?
A. Auxins promote cell elongation by increa\sing the rate of cell division.
B. Auxins promote cell elongation by increa\sing the rate of cell wall synthesis.
C. Auxins promote cell elongation by increa\sing the rate of cell wall relaxation.
D. Auxins promote cell elongation by increa\sing the rate of cell wall deposition.
Question 9
A patient is diagnosed with a bacterial infection that is resis\tant to multiple antibiotics. Which of the following is the most likely mechanism of resis\tance?
A. The bacteria have developed a mutation in the target enzyme that makes it less susceptible to the antibiotic.
B. The bacteria have developed a efflux pump that removes the antibiotic from the cell.
C. The bacteria have developed a modified target that makes it less accessible to the antibiotic.
D. The bacteria have developed a mechanism to inactivate the antibiotic.
Question 10
In a typical human cell, what is the primary function of the mitochondria?
A. To synthesize proteins
B. To store genetic information
C. To generate energy for the cell
D. To regulate cell growth
Question 11
The diagram below shows a cross-section of a plant root. Which of the following structures is responsible for the absorption of water and minerals from the soil?
A. A
B. B
C. C
D. Both B and C
Question 12
In the context of evolutionary theories, what is the primary mechanism by which genetic drift leads to the loss of genetic variation in a population?
A. Genetic drift is a random process that leads to the loss of genetic variation in a population.
B. Genetic drift is a deterministic process that leads to the loss of genetic variation in a population.
C. Genetic drift is a neutral process that does not affect the loss of genetic variation in a population.
D. Genetic drift is a selective process that leads to the loss of genetic variation in a population.
Question 13
The human eye is a complex sensory organ that allows us to perceive the world around us. Which of the following is a function of the retina in the human eye?
A. To focus light onto the lens
B. To convert light into electrical signals
C. To regulate the amount of light entering the eye
D. To produce tears to lubricate the eye
Question 14
In the process of osmoregulation, what is the primary mechanism by which the kidneys regulate the concentration of ions in the blood?
A. Active transport of ions across the renal tubules
B. Passive diffusion of ions across the renal tubules
C. Excretion of excess ions through the urine
D. Reabsorption of ions from the filtrate
Question 15
In a tropical rainforest, what is the primary source of energy for the e\cosystem?
A. Decomposers
B. Herbivores
C. Primary producers
D. Omnivores

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