POST UTME UNIOSUN 2017 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The graph below shows the growth of a bacterial culture over time. What is the name of the stage where the bacteria grow rapidly?
A. Lag phase
B. Log phase
C. Stationary phase
D. Decline phase
Question 2
The diagram below shows a cross-section of a plant stem. Which part of the stem is responsible for transporting water and minerals?
A. Cortex
B. Xylem
C. Phloem
D. Pith
Question 3
A plant cell is placed in a solution with a high concentration of sucrose. What will happen to the cell?
A. The cell will shrink due to water loss
B. The cell will swell due to water uptake
C. The cell will remain unchanged
D. The cell will burst due to osmotic pressure
Question 4
In a freshwater e\cosystem, what is the primary role of the phytoplankton community?
A. Primary producers of the e\cosystem
B. Decomposers of organic matter
C. Predators of zooplankton
D. Competitors of phytoplankton for resources
Question 5
In a tropical rainforest, the canopy layer is the most diverse in terms of species richness. Which of the following best describes the primary mechanism responsible for this diversity?
A. High levels of rainfall and warm temperatures allow for rapid growth and turnover of plant species.
B. The presence of a diverse array of tree species creates a complex web of relationships among organisms.
C. The canopy layer is subject to intense competition for light, leading to a high rate of speciation.
D. The rainforest is characterized by a high level of \endemism, with many species found nowhere else on Earth.
Question 6
Asexual reproduction in plants can occur through which of the following methods?
A. Budding
B. Fragmentation
C. Runners
D. All of the above
Question 7
The process by which plants convert light energy into chemical energy is known as:
A. Respiration
B. Photosynthesis
C. Decomposition
D. Fermentation
Question 8
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. Transport of sugars and amino acids from the leaves to the roots
C. Production of ATP through photosynthesis
D. Regulation of stomatal opening and clo\sing
Question 9
A hormone that stimulates the breakdown of glycogen to glu\cose in the liver and muscles is:
A. Glucagon
B. Insulin
C. Adrenaline
D. Thyroxine
Question 10
A diagram of a cell membrane is shown below. Which of the following statements is true regarding the structure of the cell membrane?
A. The cell membrane is a fluid mosaic model.
B. The cell membrane is a semi-permeable membrane.
C. The cell membrane is a rigid structure.
D. The cell membrane is not a structure at all.
Question 11
The sense organ responsible for detecting changes in light intensity is the Δπερλεια (Δπερλεια). What is the primary function of the Δπερλεια in this context?
A. To detect changes in sound waves
B. To detect changes in light intensity
C. To detect changes in temperature
D. To detect changes in touch
Question 12
In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope, which is triggered by the activation of the Δπρασελλες (Δπρασελλες) complex. What is the primary function of the Δπρασελλες complex in this context?
A. To bind to the centromere and initiate sister chromatid separation
B. To phosphorylate histone H3 and condense chromatin
C. To activate the anaphase-promoting complex (APC)
D. To regulate the spindle checkpoint
Question 13
The process of osmoregulation in animals involves the regulation of the concentration of solutes in the body fluids. What is the primary mechanism by which animals regulate the concentration of solutes in their body fluids?
A. By adjusting the rate of water intake and excretion
B. By regulating the concentration of ions in the body fluids
C. By adjusting the rate of nutrient uptake and excretion
D. By regulating the concentration of water in the body fluids
Question 14
The equation for the reaction of sodium hydroxide with hydrochloric acid is:
A. \( NaOH + HCl \rightarrow NaCl + H_2O \)
B. \( NaOH + HCl \rightarrow NaCl + CO_2 \)
C. \( NaOH + HCl \rightarrow NaCl + O_2 \)
D. \( NaOH + HCl \rightarrow NaCl + H_2 \)
Question 15
The human nervous system is responsible for transmitting signals between different parts of the body. What is the primary function of the synapse?
A. To transmit signals from one nerve cell to another
B. To receive signals from sensory receptors
C. To regulate muscle contraction
D. To produce hormones

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