POST UTME ACHIEVERS UNIVERSITY 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The diagram below shows the structure of the human eye. Identify the part responsible for detecting light.
A. Cornea
B. Iris
C. Retina
D. Lens
Question 2
A diagram of a simple circuit is shown below. What is the primary function of the resistor in this circuit?
A. To reduce the voltage across the light bulb
B. To increase the current flowing through the light bulb
C. To regulate the temperature of the light bulb
D. To control the brightness of the light bulb
Question 3
In the e\cosystem, what is the primary function of the decomposers?
A. To produce organic compounds
B. To break down dead organisms
C. To synthesize nutrients
D. To regulate population growth
Question 4
A population of bacteria is growing exponentially. If the initial population is 100 cells and the population doubles every 2 hours, what is the population after 6 hours?
A. 1000
B. 2000
C. 4000
D. 8000
Question 5
A diagram of a simple e\cosystem is shown below. What is the primary role of the decomposers in this e\cosystem?
A. To produce organic compounds from inorganic subs\tances
B. To break down dead organisms and recycle nutrients
C. To synthesize complex molecules from simple subs\tances
D. To regulate the population size of the animal
Question 6
In a eukaryotic cell, what is the primary function of the Golgi apparatus?
A. Protein synthesis
B. Cell signaling
C. Protein modification and transport
D. Cell division
Question 7
A population of Drosophila melanogaster is being studied for its genetic variation. The population has a mean wing length of 5.2 mm and a s\tandard deviation of 0.8 mm. If a sample of 16 flies is taken from the population, what is the probability that the sample mean wing length will be greater than 5.5 mm?
A. 0.05
B. 0.01
C. 0.005
D. 0.0005
Question 8
A population of Drosophila melanogaster is being studied for its genetic variation. The frequency of the recessive allele 'a' is 0.2, and the frequency of the dominant allele 'A' is 0.8. If two individuals are chosen at random from this population, what is the probability that they are both homozygous recessive?
A. 0.025
B. 0.05
C. 0.1
D. 0.2
Question 9
A diagram of a plant cell is shown below. What is the function of the cell wall?
A. Supports the cell
B. Regulates cell growth
C. Provides protection from pathogens
D. Involved in cell signaling
Question 10
A population of bacteria is growing exponentially. If the initial population is 1000 and the growth rate is 20% per hour, what is the population after 3 hours?
A. 1600
B. 2000
C. 2400
D. 3000
Question 11
A species of bird has a wing span of 1.5 meters. If the bird is flying at a speed of 50 km/h, what is the angular velocity of the bird's wings?
A. 10 rad/s
B. 20 rad/s
C. 30 rad/s
D. 40 rad/s
Question 12
In the context of tissue organization, what is the primary function of the basement membrane in epithelial tissues?
A. To provide structural support to the epithelial cells
B. To facilitate the exchange of nutrients and waste products
C. To act as a barrier against pathogens and toxins
D. To regulate the movement of ions and water
Question 13
In the xylem transport system, what is the primary function of the xylem parenchyma cells?
A. To transport water and minerals
B. To store starch and other nutrients
C. To produce \tannins and other defense compounds
D. To regulate water potential
Question 14
The classification of living organisms is based on the following characteristics. Which of the following is NOT a characteristic used in the classification of living organisms?
A. Cell structure
B. Morpho\logy
C. Behavior
D. Geographic distribution
Question 15
In the nervous system, what is the primary function of the axon hillock?
A. To generate action potentials
B. To transmit signals to other neurons
C. To synthesize neurotransmitters
D. To regulate ion channels

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: