POST UTME OSUSTECH 2020 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In the context of genetics, what is the term for the process by which a gene is turned on or off?
A. Gene expression
B. Gene mutation
C. Gene regulation
D. Gene duplication
Question 2
A plant has a photosynthetic rate of 10 μmol CO2 s-1. If the light intensity is increased by a factor of 4, what is the new photosynthetic rate?
A. 20 μmol CO2 s-1
B. 40 μmol CO2 s-1
C. 80 μmol CO2 s-1
D. 160 μmol CO2 s-1
Question 3
A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
C. Retina
D. Lens
Question 4
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'R'?
A. 0.8
B. 0.6
C. 0.4
D. 0.2
Question 5
The human digestive system is responsible for breaking down food into smaller molecules that can be absorbed and utilized by the body. Which of the following is a type of digestive enzyme?
A. Amylase
B. Lactase
C. Tryp\sin
D. All of the above
Question 6
A diagram of a simple harmonic motion is shown below. Identify the part labeled 'B'.
A. Spring
B. Mass
C. Damping
D. Energy
Question 7
A diagram of the human digestive system is shown below. What is the function of the part labeled 'B'?
A. To absorb nutrients
B. To break down proteins
C. To store food
D. To eliminate waste
Question 8
A population of bacteria is growing exponentially. What is the relationship between the population size and time?
A. Population size increases linearly with time
B. Population size increases exponentially with time
C. Population size remains cons\tant
D. Population size decreases exponentially with time
Question 9
In a coral reef e\cosystem, what is the primary source of energy for the food web?
A. Phytoplankton
B. Zooplankton
C. Detritus
D. Fish
Question 10
The theory of evolution by natural selection was first proposed by Charles Darwin in his book 'On the Origin of Species'. Which of the following is a key concept of this theory?
A. Survival of the fittest
B. Natural selection
C. Speciation
D. Genetic drift
Question 11
In a population of 1000 individuals, 80% are susceptible to a disease, 15% are infected, and 5% are recovered. If the disease is transmitted through direct contact with an infected individual, and the probability of transmission is 0.2, what is the expected number of new infections in the next time period?
A. 180
B. 200
C. 220
D. 240
Question 12
In the context of cell division, what is the primary function of the centrioles during the prophase stage of mitosis?
A. To form the spindle fibers
B. To replicate the DNA
C. To condense the chromatin
D. To form the nuclear envelope
Question 13
A diagram of the human kidney is shown below. Identify the part labeled 'B' in the diagram.
A. Renal cortex
B. Renal medulla
C. Renal pelvis
D. Ureter
Question 14
A plant cell is placed in a solution with a high concentration of sucrose. What is the expected outcome?
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 15
In a random sample of 1000 individuals, 60% have a certain genetic trait. If a random individual is selected, what is the probability that they do not have the genetic trait?
A. 0.4
B. 0.5
C. 0.6
D. 0.7

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