POST UTME GREENFIELD UNIVERSITY 2019 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A researcher is studying the effect of temperature on the rate of photosynthesis in a certain type of plant. The rate of photosynthesis is given by the equation R = 2e^(0.5T), where T is the temperature in degrees Celsius. If the temperature is 25°C, what is the rate of photosynthesis?
A. 100
B. 200
C. 400
D. 800
Question 2
In a tropical rainforest e\cosystem, what is the primary mechanism by which nutrients are cycled from dead organisms to living ones?
A. Decomposition by detritivores
B. Nutrient uptake by plants
C. Nutrient release through weathering
D. Nutrient cycling through symbiotic relationships
Question 3
The Hardy-Weinberg principle states that the frequency of alleles in a population will remain cons\tant from generation to generation if certain conditions are met. Which of the following is NOT one of the conditions?
A. Random mating
B. No mutation
C. No gene flow
D. No natural selection
Question 4
A 0.5-metre-tall plant is placed in a pot with a 1-metre-tall plant. The ratio of the heights of the two plants is 1:2. What is the ratio of their volumes?
A. 1:8
B. 1:4
C. 1:2
D. 2:1
Question 5
A tissue is composed of a mixture of cell types that work together to perform a specific function. Which of the following types of tissues is most likely to be composed of a mixture of cell types?
A. Epithelial tissue
B. Connective tissue
C. Muscle tissue
D. Nervous tissue
Question 6
The diagram below represents the structure of a human eye. Which of the following parts of the eye is responsible for detecting light?
A. Cornea
B. Iris
C. Retina
D. Lens
Question 7
A neuron has a resting membrane potential of -70mV. What is the primary mechanism by which the neuron becomes depolarized?
A. Influx of sodium ions
B. Efflux of potassium ions
C. Influx of chloride ions
D. Efflux of sodium ions
Question 8
A diagram of the human digestive system is shown below. Which of the following structures is responsible for the breakdown of proteins?
A. A
B. B
C. C
D. D
Question 9
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 frequency of the homozygous dominant genotype 'AA'?
A. 0.36
B. 0.64
C. 0.72
D. 0.84
Question 10
A cell is in the G2 phase of the cell cycle. What is the primary function of the cell during this phase?
A. DNA replication
B. Cell division
C. Cell growth
D. Cell differentiation
Question 11
The growth of a plant can be described as a series of stages, including germination, seedling establishment, and maturation. Which of the following is a characteristic of the seedling establishment stage?
A. The seedling develops its first set of leaves
B. The seedling develops its root system
C. The seedling develops its stem
D. The seedling develops its flowers
Question 12
A 2.5-mL sample of a 0.1-M solution of NaOH is titrated with 0.1 M HCl. What is the pH of the solution after the addition of 2.5 mL of HCl?
A. 1
B. 2
C. 3
D. 4
Question 13
A solution of glu\cose is prepared by dissolving 20g of glu\cose in 100g of water. What is the concentration of the solution in g/dL?
A. 10g/dL
B. 20g/dL
C. 30g/dL
D. 40g/dL
Question 14
A 2.5-metre-tall tree is observed to cast a shadow of 1.8 metres. At the same time, a nearby object casts a shadow of 0.9 metres. How tall is the nearby object?
A. 1.44
B. 1.8
C. 2.25
D. 2.7
Question 15
A 0.5-metre-tall plant is placed in a pot with a 1-metre-tall plant. The ratio of the heights of the two plants is 1:2. What is the ratio of their areas?
A. 1:4
B. 1:2
C. 1:1
D. 2:1

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