POST UTME NOUN 2020 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5-liter solution contains 1.5 moles of glu\cose. What is the molarity of the solution?
A. 0.6 M
B. 0.8 M
C. 1.2 M
D. 1.5 M
Question 2
A cell has a respiratory quotient (RQ) of 0.8. If the cell consumes 1.2 × 10^\( -3 \) mol of O2 per minute, what is the rate of CO2 production?
A. 9.6 × 10^\( -4 \) mol/min
B. 1.2 × 10^\( -3 \) mol/min
C. 1.6 × 10^\( -3 \) mol/min
D. 2.0 × 10^\( -3 \) mol/min
Question 3
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 wing?
A. 10 rad/s
B. 20 rad/s
C. 30 rad/s
D. 40 rad/s
Question 4
Asexual reproduction in plants can occur through the production of
A. Seeds
B. Spores
C. Buds
D. Rhizomes
Question 5
A researcher is studying the effect of pH on the growth of E. coli. The researcher measures the growth rate of the bacteria at different pH levels and plots the data on a graph. What type of graph would the researcher most likely use?
A. Bar graph
B. Line graph
C. Scatter plot
D. Histogram
Question 6
A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.25 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, what is the maximum speed of the block?
A. 0.5 m/s
B. 1.0 m/s
C. 1.5 m/s
D. 2.0 m/s
Question 7
In a forest e\cosystem, the presence of a keystone species can have a cascading effect on the entire food chain. Which of the following species is most likely to be a keystone species?
A. Lion
B. Giraffe
C. Elephant
D. Hyena
Question 8
A cell is placed in a hypotonic solution. What happens to the cell?
A. The cell shrinks due to water loss
B. The cell swells due to water uptake
C. The cell remains unchanged
D. The cell bursts due to osmotic pressure
Question 9
In the process of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
B. To pump protons across the mitochondrial inner membrane
C. To produce NADH and FADH2
D. To reduce oxygen to water
Question 10
A researcher is studying the effect of temperature on the growth of a microorganism. The researcher measures the growth rate of the microorganism at different temperatures and plots the data on a graph. What type of graph would the researcher most likely use?
A. Bar graph
B. Line graph
C. Scatter plot
D. Histogram
Question 11
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population size is 1000, what is the expected number of homozygous recessive individuals?
A. 180
B. 200
C. 220
D. 240
Question 12
A population of rabbits is introduced to an island with no natural predators. Which of the following will happen to the population?
A. The population will remain cons\tant.
B. The population will decrease due to lack of resources.
C. The population will increase exponentially.
D. The population will stabilize at a carrying capacity.
Question 13
What is the primary function of the mitochondria in a cell?
A. To synthesize proteins
B. To generate ATP through substrate-level phosphorylation
C. To produce NADH and FADH2
D. To reduce oxygen to water
Question 14
A plant has a xylem vessel with a diameter of 10 μm. If the xylem sap has a vis\cosity of 1.2 × 10^\( -3 \) Pa·s, what is the pressure required to push 1.5 mL of sap through the vessel in 5 minutes?
A. 2.5 × 10^4 Pa
B. 5.0 × 10^4 Pa
C. 1.0 × 10^5 Pa
D. 2.0 × 10^5 Pa
Question 15
The process of respiration in humans involves the breakdown of glu\cose to produce energy. Which of the following equations represents this process?
A. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O \)
B. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O_2 \)
C. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2 \)
D. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O \)

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: