POST UTME UNILORIN 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 10.0-mL sample of a solution containing 0.50 M CaCl2 is diluted to 100.0 mL. What is the concentration of the resulting solution?
A. 0.01 M
B. 0.05 M
C. 0.10 M
D. 0.20 M
Question 2
The diagram below shows a cross-section of a plant root. Which of the following tissues is responsible for the absorption of water and minerals from the soil?
A. Cortex
B. Endodermis
C. Pericycle
D. Xylem
Question 3
The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of glu\cose. Which of the following is a byproduct of photosynthesis?
A. Oxygen
B. Carbon dioxide
C. Water
D. Nitrogen
Question 4
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 protein kinase Cdk1. What is the primary function of Cdk1 in this process?
A. To phosphorylate and activate the nuclear lamina
B. To degrade the nuclear envelope
C. To regulate the spindle assembly checkpoint
D. To control the condensation of chromatin
Question 5
The concept of eco\logical niches refers to the specific role or position that an organism occupies within its environment. Which of the following is an example of a competitive exclusion principle?
A. The presence of two species with identical eco\logical niches in the same environment
B. The presence of two species with different eco\logical niches in the same environment
C. The presence of a \single species with a unique eco\logical niche in an environment
D. The absence of a species in an environment due to the presence of a competing species
Question 6
A patient has been diagnosed with a bacterial infection. The bacteria have developed resis\tance to multiple antibiotics. What is the most likely cause of this resis\tance?
A. Horizontal gene transfer
B. Vertical gene transfer
C. Mutation
D. Gene editing
Question 7
A plant has a high concentration of stomata on its leaves. What is the primary function of these stomata?
A. To regulate the plant's temperature
B. To store water
C. To exchange gases
D. To protect the plant from excessive light
Question 8
The process of digestion in the human body involves the breakdown of food into smaller molecules that can be absorbed and utilized by the body. Which of the following enzymes is responsible for breaking down proteins into amino acids?
A. Amylase
B. Lipase
C. Pep\sin
D. Tryp\sin
Question 9
In a photosynthetic pathway, which of the following pigments is primarily responsible for absorbing light in the blue-violet region of the visible spectrum?
A. Chlorophyll a
B. Chlorophyll b
C. Carotenoids
D. Phycobiliproteins
Question 10
A solution contains 5.0 g of glu\cose (C6H12O6) dissolved in 100 mL of water. What is the molarity of the solution?
A. 0.25 M
B. 0.50 M
C. 0.75 M
D. 1.00 M
Question 11
A river flows through a valley and eventually empties into a lake. What is the primary mechanism by which the river's water is purified?
A. Photosynthesis
B. Respiration
C. Filtration
D. Oxidation
Question 12
The nervous system of an organism is responsible for transmitting signals from one part of the body to another. Which of the following types of neurons is responsible for transmitting signals from sensory receptors to the central nervous system?
A. Motor neuron
B. Sensory neuron
C. Interneuron
D. Association neuron
Question 13
The human brain is a complex organ that is responsible for controlling the body's functions and facilitating thought and behavior. Which of the following types of neurons is responsible for transmitting signals from sensory receptors to the central nervous system?
A. Motor neuron
B. Sensory neuron
C. Interneuron
D. Association neuron
Question 14
The process of osmoregulation in animals involves the regulation of the concentration of solutes in the body fluids. Which of the following organs plays a crucial role in this process?
A. Kidneys
B. Liver
C. Pancreas
D. Adrenal glands
Question 15
A 50.0-mL sample of a solution containing 0.50 M HCl is titrated with 0.50 M NaOH. What is the pH of the resulting solution after the addition of 50.0 mL of NaOH?
A. 7.00
B. 8.00
C. 9.00
D. 10.00

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