POST UTME GREENFIELD UNIVERSITY 2017 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The process of cellular respiration in aerobic organisms involves the breakdown of glu\cose to produce
A. carbon dioxide and water
B. oxygen and water
C. glu\cose and oxygen
D. water and carbon dioxide
Question 2
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 3
The process of photosynthesis occurs in the chloroplasts of plant cells. What is the primary function of the light-dep\endent reactions?
A. To produce ATP and NADPH
B. To produce glu\cose and oxygen
C. To produce starch and cellulose
D. To produce amino acids and lipids
Question 4
A plant grows in a pot with a mixture of soil and fertilizer. The fertilizer contains 20% nitrogen, 10% phosphorus, and 70% potassium. If 100 g of fertilizer is added to the soil, what is the mass of nitrogen in the fertilizer?
A. 20 g
B. 30 g
C. 40 g
D. 50 g
Question 5
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 6
A cell is placed in a solution containing 0.1 M glu\cose and 0.2 M fructose. If the cell membrane is permeable to both sugars, what is the concentration of glu\cose inside the cell after 10 minutes?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 7
In the context of evolutionary theories, what is the primary mechanism by which natural selection acts on genetic variation?
A. Genetic drift
B. Gene flow
C. Mutation
D. Differential reproduction
Question 8
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 9
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 10
A plant has a xylem sap concentration of 0.5 M. If the plant is subjected to a temperature increase of 10°C, what is the expected change in xylem sap concentration?
A. 0.5 M
B. 0.6 M
C. 0.4 M
D. 0.3 M
Question 11
A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 0.05 per hour, what will be the population size after 5 hours?
A. 1000
B. 5000
C. 10000
D. 20000
Question 12
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
Question 13
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 14
The microorganism responsible for the spoilage of milk is
A. Escherichia coli
B. Staphylococcus aureus
C. Bacillus subtilis
D. Lactobacillus acidophilus
Question 15
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

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