POST UTME ELIZADE UNIVERSITY 2023 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A cell is placed in a solution with a pH of 7. If the cell has a membrane potential of -60 mV, what is the concentration of hydrogen ions in the solution?
A. 10^{-7} M
B. 10^{-6} M
C. 10^{-5} M
D. 10^{-4} M
Question 2
The diagram below represents a cross-section of a plant root. Identify the structure labeled 'A' and describe its function.
A. The root hair cells are responsible for absorbing water and minerals from the soil.
B. The xylem is responsible for transporting water and minerals from the roots to the leaves.
C. The phloem is responsible for transporting sugars and other organic compounds produced by photosynthesis.
D. The root cap protects the root tip from mechanical damage.
Question 3
The theory of evolution by natural selection was first proposed by
A. Charles Darwin
B. Gregor M\endel
C. Jean-Baptiste Lamarck
D. Alfred Russel Wallace
Question 4
A diagram of a plant cell is shown below. What is the function of the cell wall?
A. To provide structural support to the cell
B. To regulate the movement of materials in and out of the cell
C. To maintain the cell's shape and prevent it from bursting
D. To control the cell's growth and division
Question 5
In the context of plant nutrition, what is the primary function of the root hairs?
A. Water absorption
B. Nutrient uptake
C. Support structure
D. Storage organ
Question 6
What is the term for the process by which cells divide and produce two daughter cells?
A. Mitosis
B. Meiosis
C. Binary fission
D. Endoreduplication
Question 7
What is the primary mechanism by which the pancreas regulates blood glu\cose levels?
A. Insulin secretion
B. Glucagon secretion
C. Gastric emptying
D. Hormonal regulation
Question 8
The process of osmoregulation in plants involves the movement of water and ions across the plasma membrane. Which of the following statements is correct regarding the role of aquaporins in this process?
A. Aquaporins facilitate the movement of ions across the plasma membrane.
B. Aquaporins are responsible for the movement of water across the plasma membrane.
C. Aquaporins play a crucial role in the regulation of stomatal aperture.
D. Aquaporins are involved in the transport of nutrients across the plasma membrane.
Question 9
In the human eye, what is the primary function of the retina?
A. To focus light on the lens
B. To detect light and transmit signals to the brain
C. To regulate pupil size
D. To produce tears
Question 10
A nerve impulse travels down a neuron through the process of
A. Diffusion
B. Osmosis
C. Active transport
D. Electrical conduction
Question 11
What is the term for the process by which plants convert light energy into chemical energy?
A. Respiration
B. Photosynthesis
C. Transpiration
D. Translocation
Question 12
The equation for the rate of gas exchange in plants is given by the following formula:
A. The rate of gas exchange is directly proportional to the difference in concentration between the surrounding air and the intercellular spaces.
B. The rate of gas exchange is inversely proportional to the concentration of CO2 in the surrounding air.
C. The rate of gas exchange is directly proportional to the temperature of the surrounding air.
D. The rate of gas exchange is inversely proportional to the humidity of the surrounding air.
Question 13
A species of bird has a beak length of 10 cm. If the beak length is normally distributed with a mean of 12 cm and a s\tandard deviation of 2 cm, what is the probability that a randomly selected bird will have a beak length greater than 14 cm?
A. 0.0228
B. 0.1587
C. 0.3413
D. 0.4772
Question 14
In a eukaryotic cell, the process of cell division that results in the production of four daughter cells, each with the same number and kind of chromosomes as the parent cell, is called
A. Mitosis
B. Meiosis
C. Binary Fission
D. Endoreduplication
Question 15
In the classification of living organisms, what is the primary function of the kingdom level?
A. To group organisms based on their cell structure
B. To group organisms based on their body structure
C. To group organisms based on their metabolic processes
D. To group organisms based on their evolutionary relationships

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