POST UTME BELLS UNIVERSITY 2024 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The diagram below shows a cross-section of a plant root. Identify the part labeled 'A'.
A. Xylem
B. Phloem
C. Cortex
D. Endodermis
Question 2
In the context of eco\logy, what is the primary function of a keystone species?
A. Regulation of population sizes of other species
B. Maintenance of e\cosystem diversity
C. Production of nutrients through decomposition
D. Modification of physical environment
Question 3
A plant undergoes a process called photoinhibition when it is exposed to high levels of light. What is the primary cause of photoinhibition?
A. Water stress
B. High temperature
C. High light intensity
D. Low CO2 levels
Question 4
A geneticist wants to study the inheri\tance of a particular trait in a population of Drosophila melanogaster. Which type of genetic cross would be most suitable for this study?
A. Backcross
B. Testcross
C. Inbred line
D. F2 generation
Question 5
In a population of 1000 individuals, 70% are heterozygous for the ABO blood group and 30% are homozygous recessive. If a random sample of 50 individuals is taken, what is the probability that at least 30 of them will be homozygous recessive?
A. 0.5
B. 0.6
C. 0.7
D. 0.8
Question 6
A bio\logist is studying the growth of a population of bacteria in a controlled environment. Which of the following equations represents the exponential growth of the population?
A. \( \frac{dP}{dt} = rP \)
B. \( \frac{dP}{dt} = r \)
C. \( \frac{dP}{dt} = -rP \)
D. \( \frac{dP}{dt} = -r \)
Question 7
A population of rabbits is growing at a rate of 20% per year. If the population is currently 1000 rabbits, what will be the population after 5 years?
A. 2000
B. 4000
C. 16000
D. 32000
Question 8
A cell undergoes a process called apoptosis when it is exposed to high levels of radiation. What is the primary cause of apoptosis?
A. DNA damage
B. Protein synthesis inhibition
C. Cell signaling disruption
D. Mitochondrial dysfunction
Question 9
In a human kidney, what is the primary function of the loop of Henle?
A. Reabsorption of glu\cose
B. Reabsorption of water
C. Excretion of urea
D. Excretion of potassium ions
Question 10
The classification of living organisms into kingdoms is based on their cell structure and mode of nutrition. Which of the following kingdoms is characterized by the presence of a cell wall and the absence of flagella?
A. Animalia
B. Plantae
C. Fungi
D. Protista
Question 11
The diagram below shows the structure of a neuron. What is the function of the d\endrites?
A. To synthesize proteins
B. To store genetic information
C. To receive signals from other neurons
D. To transmit signals to other neurons
Question 12
The diagram below shows the structure of a mitochondrion. Which part is responsible for the synthesis of ATP?
A. A
B. B
C. C
D. D
Question 13
A researcher is studying the effect of temperature on the rate of photosynthesis in plants. The researcher measures the rate of photosynthesis at different temperatures and plots the data on a graph. If the graph shows a positive correlation between temperature and rate of photosynthesis, what can be concluded about the relationship between temperature and rate of photosynthesis?
A. Temperature has a positive effect on the rate of photosynthesis
B. Temperature has a negative effect on the rate of photosynthesis
C. Temperature has no effect on the rate of photosynthesis
D. The relationship between temperature and rate of photosynthesis is unclear
Question 14
The process of mitosis in eukaryotic cells involves the division of the nucleus into two daughter nuclei. Which of the following stages of mitosis is responsible for the separation of chromosomes?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 15
A plant cell is placed in a solution containing 0.1 M glu\cose. If the cell membrane is permeable to glu\cose, what will happen to the concentration of glu\cose inside the cell?
A. The concentration of glu\cose will increase
B. The concentration of glu\cose will decrease
C. The concentration of glu\cose will remain the same
D. The cell will take up glu\cose by active transport

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