POST UTME GREENFIELD UNIVERSITY 2017 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A population of bacteria is growing exponentially. If the initial population is 100 cells and the population doubles every 2 hours, what is the population after 6 hours?
A. 1000 cells
B. 2000 cells
C. 4000 cells
D. 8000 cells
Question 2
A plant's growth rate is influenced by the concentration of auxins in its cells. What is the primary effect of auxins on plant growth?
A. Inhibits cell elongation
B. Promotes cell division
C. Increases cell wall thickness
D. Enhances root growth
Question 3
In the context of evolutionary theory, what is the primary mechanism driving the adaptation of populations to changing environments?
A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation
Question 4
The xylem is a type of vascular tissue in plants that is responsible for transporting water and minerals from the roots to the leaves. What is the primary function of the xylem parenchyma cells?
A. To produce xylem sap
B. To transport water and minerals
C. To store starch
D. To produce xylem fibers
Question 5
A diagram of a human heart is shown below. What is the primary function of the atrioventricular (AV) node in the cardiac cycle?
A. To regulate the heart rate
B. To pump blood from the atria to the ventricles
C. To release oxygenated blood into the aorta
D. To store blood in the ventricles
Question 6
In a population of 1000 individuals, the frequency of the dominant allele (A) is 0.6 and the frequency of the recessive allele (a) is 0.4. What is the expected frequency of the homozygous dominant genotype (AA)?
A. 0.36
B. 0.48
C. 0.64
D. 0.72
Question 7
The diagram below shows the structure of a cell. Which of the following organelles is responsible for protein synthesis?
A. Nucleus
B. Mitochondria
C. Ribosomes
D. Endoplasmic reticulum
Question 8
A genetic cross between two individuals with the genotype AaBb results in offspring with the following phenotypes: 25% AA BB, 50% AaBb, 25% aaBB. What is the probability of an offspring inheriting the dominant allele for the A locus?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 9
The Hardy-Weinberg principle states that the frequency of alleles in a population will remain cons\tant from generation to generation if five certain conditions are met. Which of the following is NOT one of these conditions?
A. Large population size
B. Random mating
C. No mutation
D. No genetic drift
Question 10
A diagram of a human reproductive system is shown below. What is the primary function of the epididymis in the male reproductive system?
A. To store sperm cells
B. To transport sperm cells from the testes to the vas deferens
C. To release sperm cells into the ejaculatory duct
D. To produce testosterone hormones
Question 11
The xylem tissue in plants is responsible for
A. transporting water and minerals from the roots to the leaves
B. transporting sugars and amino acids from the leaves to the roots
C. producing energy for the plant through photosynthesis
D. storing water and nutrients in the plant
Question 12
A 20% glu\cose solution is diluted to 10% glu\cose. What is the ratio of the initial volume to the final volume?
A. 1:2
B. 2:1
C. 1:1
D. 3:1
Question 13
The process of digestion in the human small intestine involves the action of
A. salivary amylase
B. pancreatic amylase
C. pep\sin
D. tryp\sin
Question 14
Asexual reproduction in plants can occur through which of the following methods?
A. Budding
B. Fragmentation
C. Spore formation
D. All of the above
Question 15
In a photosynthetic process, what is the primary function of the thylakoid membrane?
A. To absorb light energy
B. To release oxygen gas
C. To synthesize glu\cose
D. To store energy in ATP

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