POST UTME ACHIEVERS UNIVERSITY 2020 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A bio\logist is studying the classification of living organisms. Which of the following kingdoms is characterized by the presence of true branching and vascular tissues?
A. Animalia
B. Plantae
C. Fungi
D. Protista
Question 2
A population of 1000 rabbits is introduced to an island. The population grows at a rate of 20% per year. What is the population after 5 years?
A. 3241
B. 3248
C. 3256
D. 3264
Question 3
A plant has a genotype of Rr for a particular gene. If the plant is crossed with a plant having the genotype rr, what is the probability that the offspring will have the genotype RR?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 4
A diagram of the human kidney is shown below. Which part of the kidney is responsible for filtering waste from the blood?
A. Glomerulus
B. Proximal Convoluted Tubule
C. Distal Convoluted Tubule
D. Collecting Duct
Question 5
A 2.5g sample of a subs\tance is dissolved in 100g of water. What is the concentration of the solution in g/100g?
A. 2.5g/100g
B. 5g/100g
C. 7.5g/100g
D. 10g/100g
Question 6
What is the primary function of the xylem in plants?
A. To transport water and minerals from the roots to the leaves
B. To transport sugars and other organic compounds from the leaves to the rest of the plant
C. To regulate gas exchange between the plant and the atmosphere
D. To maintain structural support for the plant
Question 7
In a typical xylem vessel, what is the primary function of the lignin component?
A. To provide structural support to the vessel
B. To facilitate the transport of water and minerals
C. To regulate the rate of transpiration
D. To absorb excess water from the soil
Question 8
What is the primary function of the hypothalamus in the regulation of body temperature?
A. To produce hormones that stimulate sweating and vasodilation
B. To produce hormones that stimulate shivering and vasoconstriction
C. To regulate body temperature through the production of hormones that stimulate heat loss and heat gain
D. To maintain structural support for the body
Question 9
In a population of E. coli bacteria, the frequency of a particular mutation is 0.05. If the population size is 10^6, how many bacteria are expected to have the mutation?
A. 500
B. 5000
C. 50,000
D. 500,000
Question 10
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'Rr'?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 11
A plant has a genotype of BBSS for a particular gene. If the plant is crossed with a plant having the genotype bbss, what is the probability that the offspring will have the genotype BbSS?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 12
In a desert e\cosystem, what is the primary mechanism by which plants conserve water?
A. Transpiration and stomatal closure
B. Photosynthesis and water storage
C. Nutrient uptake through roots and water conservation
D. CAM photosynthesis and crassulacean acid metabolism
Question 13
In the context of blood transport systems, what is the primary function of the erythrocytes?
A. To transport oxygen from the lungs to the tissues
B. To transport carbon dioxide from the tissues to the lungs
C. To regulate body temperature
D. To maintain acid-base balance
Question 14
A solution of 0.1 M NaCl is diluted to 0.01 M. What is the new concentration of Na+ ions?
A. 0.001 M
B. 0.01 M
C. 0.1 M
D. 1 M
Question 15
In a tropical rainforest e\cosystem, what is the primary role of the leaf's cuticle in relation to water loss?
A. To prevent water loss through transpiration
B. To facilitate water uptake through the roots
C. To regulate stomatal opening and clo\sing
D. To protect the leaf from excessive sunlight

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