POST UTME DELSU 2017 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The growth of a plant is influenced by the
A. Presence of light
B. Absence of water
C. Presence of nutrients
D. Absence of oxygen
Question 2
In a population of 1000 individuals, 80% are homozygous dominant (BB), 15% are heterozygous (Bb), and 5% are homozygous recessive (bb). What is the probability that two individuals chosen at random will have offspring with the BB genotype?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 3
A plant has a root system that is adapted to absorb water from a dry soil. What is the name of this adaptation?
A. Taproot
B. Fibrous root
C. Adventitious root
D. Mycoheterotrophy
Question 4
A researcher is studying the effect of pH on the growth of E. coli. The researcher measures the growth rate of the bacteria at different pH levels and plots the data on a graph. If the graph shows a sigmoidal curve, what type of growth is the bacteria exhibiting?
A. Logistic growth
B. Exponential growth
C. Linear growth
D. No growth
Question 5
A patient has a hormone imbalance. Which of the following hormones is responsible for regulating blood sugar levels?
A. Insulin
B. Glucagon
C. Adrenaline
D. Thyroid hormone
Question 6
In a tropical rainforest biome, what is the primary mechanism by which nutrients are cycled?
A. Decomposition by fungi and bacteria
B. Photosynthesis by plants
C. Nutrient uptake by animals
D. Weathering of rocks
Question 7
A population of 1000 individuals is divided into 10 groups of 100 individuals each. Each group has a different allele frequency for a particular gene. Which of the following is a likely outcome of this situation?
A. The population will become more homogeneous
B. The population will become more heterogeneous
C. The population will remain the same
D. The population will become extinct
Question 8
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 graph shows a straight line, what type of reaction is the researcher studying?
A. Exothermic reaction
B. Endothermic reaction
C. Neutral reaction
D. No reaction
Question 9
A solution of 0.1 M NaCl is diluted to 0.01 M. What is the new concentration of Na+ ions?
A. 0.01 M
B. 0.1 M
C. 0.05 M
D. 0.005 M
Question 10
A patient has a blood pressure of 180/100 mmHg. What is the primary mechanism by which the kidneys regulate blood pressure?
A. Renin-angioten\sin-aldosterone system
B. Sympathetic nervous system
C. Parasympathetic nervous system
D. Baroreceptors
Question 11
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
A. To focus light on the retina
B. To detect movement
C. To regulate pupil size
D. To produce tears
Question 12
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. 0.64
B. 0.36
C. 0.16
D. 0.04
Question 13
A researcher is studying the effect of a new pesticide on a population of insects. The pesticide kills 20% of the insects in the first week, 30% in the second week, and 40% in the third week. What is the total percentage of insects killed after three weeks?
A. 60%
B. 70%
C. 80%
D. 90%
Question 14
A researcher is studying the effect of pH on the activity of the enzyme lactase. Which of the following would be the most appropriate way to express the relationship between pH and enzyme activity?
A. pH vs. enzyme activity
B. enzyme activity vs. pH
C. \log(pH) vs. enzyme activity
D. \log(enzyme activity) vs. pH
Question 15
A bio\logist is studying the effect of light on the growth of plants. She measures the growth of 10 plants under different light conditions and obtains the following data: Plant 1: 5 cm, Plant 2: 7 cm, Plant 3: 3 cm, Plant 4: 9 cm, Plant 5: 4 cm, Plant 6: 6 cm, Plant 7: 8 cm, Plant 8: 2 cm, Plant 9: 10 cm, Plant 10: 1 cm. What is the mean growth of the plants?
A. 5 cm
B. 6 cm
C. 7 cm
D. 8 cm

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