POST UTME REDEEMERS UNIVERSITY 2017 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of the human respiratory system is shown below. What is the primary function of the alveoli?
A. Exchange of oxygen and carbon dioxide
B. Production of surfac\tant
C. Filtering of blood
D. Regulation of breathing rate
Question 2
In a photosynthetic pathway, which of the following electron carriers is responsible for transferring electrons from plastocyanin to the reaction center of photosystem II?
A. Ferredoxin
B. Cytochrome b6f complex
C. Plastocyanin
D. P700
Question 3
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. What is the expected frequency of the homozygous recessive genotype 'aa'?
A. 0.04
B. 0.08
C. 0.12
D. 0.16
Question 4
In a tropical rainforest e\cosystem, the primary consumers are primarily herbivores that feed on the abundant plant life. However, some of these herbivores have evolved to become omnivores, consuming both plants and small animals. Which of the following best describes the trophic level of these omnivorous herbivores?
A. Primary consumer
B. Secondary consumer
C. Tertiary consumer
D. Decomposer
Question 5
In the context of hormonal coordination, what is the primary function of the hypothalamus?
A. Regulation of body temperature
B. Stimulation of appetite
C. Regulation of hormone secretion
D. Inhibition of stress response
Question 6
A diagram of a photosynthetic pathway is shown below. What is the role of the structure labeled 'B'?
A. Light-dep\endent reactions
B. Light-indep\endent reactions
C. ATP synthesis
D. NADPH synthesis
Question 7
A geneticist is studying the inheri\tance of a particular trait in a population of mice. The trait is controlled by a \single gene with two alleles: A and a. The genotype and phenotype of the mice are as follows:
A. AA and AA
B. Aa and Aa
C. aa and aa
D. Aa and aa
Question 8
A species of bird has a wing span of 1.5 meters. If the bird is flying at a speed of 50 km/h, what is the power output of the bird's wings?
A. 1000 W
B. 500 W
C. 2000 W
D. 3000 W
Question 9
The Hardy-Weinberg principle states that a population will be in equilibrium if the following conditions are met. Which of the following is NOT a condition for Hardy-Weinberg equilibrium?
A. No mutation
B. No gene flow
C. Random mating
D. Cons\tant population size
Question 10
A 2.5-mL sample of a 0.15 M NaCl solution is diluted to a total volume of 10 mL. What is the concentration of the resulting solution?
A. 0.015 M
B. 0.015 M
C. 0.015 M
D. 0.015 M
Question 11
A plant has a photosynthetic rate of 10 mg CO2 per hour. If the plant is exposed to light for 8 hours, how much CO2 will it absorb?
A. 80 mg
B. 100 mg
C. 120 mg
D. 140 mg
Question 12
The process by which an organism's cells become specialized to perform specific functions is called?
A. Mitosis
B. Meiosis
C. Differentiation
D. Heredity
Question 13
In the context of growth and regulation, what is the primary function of the pituitary gland?
A. To regulate the release of hormones that stimulate growth
B. To regulate the release of hormones that inhibit growth
C. To regulate the release of hormones that stimulate metabolism
D. To regulate the release of hormones that inhibit metabolism
Question 14
A diagram of the human excretory system is shown below. What is the primary function of the kidneys?
A. Regulation of blood pressure
B. Production of urine
C. Filtering of blood
D. Regulation of electrolyte balance
Question 15
The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. However, this principle assumes that the population is infinitely large. What is the term for the phenomenon that occurs when the frequency of a particular allele decreases due to genetic drift in a small population?
A. Genetic hitchhiking
B. Genetic drift
C. Genetic mutation
D. Genetic recombination

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: