POST UTME NILE UNIVERSITY 2024 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In the xylem, what is the primary function of the tracheids?
A. Transport of water and minerals from the roots to the leaves
B. Transport of sugars and other organic compounds from the leaves to the rest of the plant
C. Support and structure for the plant
D. Storage of food and water
Question 2
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 3
A diagram of the human brain is shown below. Which part of the brain is responsible for controlling movement?
A. Cerebrum
B. Cerebellum
C. Basal Ganglia
D. Brainstem
Question 4
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 5
A population of E. coli is growing in a nutrient-rich environment. If the population doubles every 2 hours, what is the expected population size after 4 hours?
A. 1000
B. 2000
C. 4000
D. 8000
Question 6
A tree has a trunk diameter of 20 cm and a height of 10 m. If the trunk grows at a rate of 0.5 cm/day and the height grows at a rate of 1 m/day, how long will it take for the trunk to be 30 cm in diameter?
A. 10 days
B. 20 days
C. 30 days
D. 40 days
Question 7
What is the term for the process by which plants release water vapor into the air?
A. Transpiration
B. Respiration
C. Photosynthesis
D. Evaporation
Question 8
The classification of living organisms is based on their evolutionary relationships. Which of the following taxonomic ranks is the most specific?
A. Domain
B. Kingdom
C. Phylum
D. Species
Question 9
A researcher is studying the effect of temperature on the rate of a chemical reaction. The researcher measures the rate of the reaction at different temperatures and plots the data on a graph. If the rate of the reaction is highest at 50°C and lowest at 20°C, what can be concluded about the effect of temperature on the rate of the reaction?
A. The rate of the reaction increases with increa\sing temperature.
B. The rate of the reaction decreases with increa\sing temperature.
C. The rate of the reaction remains cons\tant with increa\sing temperature.
D. The rate of the reaction is unaffected by temperature.
Question 10
In the context of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP from NADH and FADH2
B. To produce water from oxygen and electrons
C. To synthesize glu\cose from CO2 and H2O
D. To generate NADH and FADH2 from glu\cose
Question 11
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 12
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
A. Nucleus
B. Mitochondria
C. Chloroplast
D. Vacuole
Question 13
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 14
The process by which plants convert light energy into chemical energy is known as
A. Photosynthesis
B. Respiration
C. Transpiration
D. Translocation
Question 15
A plant has a root system that consists of a taproot and a network of smaller roots. The taproot grows at a rate of 2 cm/day, while the smaller roots grow at a rate of 1 cm/day. If the taproot is 10 cm long and the smaller roots are 5 cm long, how long will it take for the taproot to be twice as long as the smaller roots?
A. 5 days
B. 10 days
C. 15 days
D. 20 days

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