POST UTME LASU 2018 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The process of osmoregulation in plants involves the movement of water across the plasma membrane. Which of the following is a key component of the osmoregulatory system in plants?
A. Aquaporins
B. Proton pumps
C. ATPases
D. Ion channels
Question 2
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
A. To focus light on the retina
B. To detect light intensity
C. To regulate pupil size
D. To produce tears
Question 3
In a closed e\cosystem, the rate of respiration in a population of organisms is directly proportional to the square root of the population size. If the population size doubles, what is the new rate of respiration?
A. Increases by a factor of 2
B. Increases by a factor of 4
C. Increases by a factor of 8
D. Remains the same
Question 4
The respiratory system in humans is primarily responsible for the exchange of gases between the environment and the body. Which of the following is a key component of the respiratory system?
A. Trachea
B. Bronchi
C. Lungs
D. Diaphragm
Question 5
The hormone insulin is produced by the pancreas and plays a crucial role in regulating blood sugar levels. Which of the following is a function of insulin?
A. Increa\sing blood glu\cose levels
B. Decrea\sing blood glu\cose levels
C. Regulating protein synthesis
D. Regulating lipid metabolism
Question 6
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
A. Mitochondria
B. Chloroplast
C. Nucleus
D. Vacuole
Question 7
The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a necessary condition for the Hardy-Weinberg principle to hold?
A. Random mating
B. No mutation
C. No gene flow
D. No genetic drift
Question 8
A researcher is studying the effect of temperature on the rate of photosynthesis in a plant. The researcher measures the rate of photosynthesis at different temperatures and plots the data on a graph. Which of the following is the most likely shape of the graph?
A. A straight line
B. A curve with a maximum rate at a certain temperature
C. A curve with a minimum rate at a certain temperature
D. A straight line with a negative slope
Question 9
In the process of cellular respiration, which of the following is the primary source of energy for the cell?
A. Glu\cose
B. ATP
C. NADH
D. FADH2
Question 10
A researcher is studying the effect of pH on the growth of a microorganism. The growth rate is measured in terms of the rate of increase in cell density. If the pH of the medium is increased by 1 unit, what is the new growth rate?
A. Increases by a factor of 2
B. Increases by a factor of 4
C. Increases by a factor of 8
D. Remains the same
Question 11
A diagram of the human kidney is shown below. What is the function of the part labeled 'B'?
A. To filter waste from the blood
B. To regulate blood pressure
C. To produce urine
D. To store waste
Question 12
A 5-year-old child is diagnosed with a rare genetic disorder characterized by an inability to break down certain fatty acids. Which of the following is the most likely underlying cause?
A. Deficiency of the enzyme acyl-CoA dehydrogenase
B. Deficiency of the enzyme carnitine palmitoyltransferase
C. Deficiency of the enzyme very-long-chain acyl-CoA dehydrogenase
D. Deficiency of the enzyme long-chain acyl-CoA dehydrogenase
Question 13
A population of Drosophila melanogaster is maintained in a laboratory. The population size is 1000 individuals, and the sex ratio is 1:1. The average lifespan of the flies is 30 days. If the population is allowed to grow exponentially, what is the carrying capacity of the population?
A. 1000
B. 5000
C. 10000
D. 20000
Question 14
In a study on the effect of light on plant growth, the following data were collected: Light (hours) | Growth (cm) 0 | 2 4 | 4 8 | 6 12 | 8. What is the rate of growth per hour of light?
A. 0.5 cm/h
B. 1 cm/h
C. 1.5 cm/h
D. 2 cm/h
Question 15
A plant with the genotype 'Tt' is crossed with a plant with the genotype 'tt'. What is the probability that the offspring will have the genotype 'TT'?
A. 0.25
B. 0.5
C. 0.75
D. 0.9

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: