POST UTME NILE UNIVERSITY 2024 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?
A. Cornea
B. Lens
C. Retina
D. Iris
Question 2
In a tropical rainforest, the energy flow from producers to primary consumers is described by the equation \( \frac{dE}{dt} = rE left\( 1 - \frac{E}{K} \right \ \) ). If the carrying capacity ( K ) is 1000 units and the intrinsic growth rate ( r ) is 0.5, what is the equilibrium population size ( E )?
A. 500
B. 750
C. 1000
D. 1250
Question 3
A population of 1000 rabbits is introduced to a new island. The population grows according to the \logistic equation \( \frac{dP}{dt} = rP left\( 1 - \frac{P}{K} \right \ \) ), where \( r = 0.2 \) and \( K = 2000 \). If the initial population is 1000, what is the population size after 5 years?
A. 1500
B. 1800
C. 2000
D. 2200
Question 4
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the expected frequency of the homozygous dominant genotype 'AA'?
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 5
The process by which an organism becomes better suited to its environment is known as
A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation
Question 6
A plant is placed in a potting mix with a pH of 6.5. If the plant requires a pH of 5.5 to grow optimally, what type of fertilizer should be added to the potting mix?
A. Acidic fertilizer
B. Basic fertilizer
C. Neutral fertilizer
D. Organic fertilizer
Question 7
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
A. Nucleus
B. Mitochondria
C. Chloroplast
D. Vacuole
Question 8
A plant is placed in a greenhouse with a temperature of 25°C and a relative humidity of 60%. If the plant requires a temperature of 20°C and a relative humidity of 80% to grow optimally, what is the expected rate of photosynthesis?
A. 0.01 mmol/min
B. 0.1 mmol/min
C. 1 mmol/min
D. 10 mmol/min
Question 9
In a tropical rainforest, the primary consumers are primarily herbivores that feed on the abundant plant life. Which of the following adaptations would be most beneficial for these herbivores to survive in this environment?
A. Large body size to intimidate predators
B. Specialized digestive system to break down cellulose in plant cell walls
C. Strong claws for climbing trees
D. Camouflage to bl\end in with surroundings
Question 10
The xylem is responsible for transporting
A. Water and minerals
B. Sugars and amino acids
C. Oxygen and carbon dioxide
D. Waste products
Question 11
The process of photosynthesis in plants involves the conversion of light energy into chemical energy. Which of the following equations represents the overall equation for photosynthesis?
A. \( 6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2 \)
B. \( 6CO_2 + 6H_2O + light \ energy \rightarrow C_6H_{12}O_6 + 6O_2 \)
C. \( 6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 \)
D. \( 6CO_2 + 6H_2O \rightarrow 6O_2 \)
Question 12
A diagram of a human eye is shown below. Identify the part labeled 'B'.
A. Cornea
B. Iris
C. Retina
D. Lens
Question 13
In the human eye, what is the primary function of the retina?
A. To focus light onto the lens
B. To detect light and convert it into electrical signals
C. To regulate the amount of light entering the eye
D. To produce tears to lubricate the eye
Question 14
A kidney stone is formed due to the precipitation of calcium oxalate crystals. What is the primary cause of this precipitation?
A. High pH
B. Low pH
C. High temperature
D. Low temperature
Question 15
The process of respiration in humans involves the breakdown of glu\cose to produce energy. Which of the following equations represents the overall equation for cellular respiration?
A. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O \)
B. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP \)
C. \( C_6H_{12}O_6 \rightarrow 6CO_2 + 6H_2O \)
D. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 \)

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