POST UTME ACHIEVERS UNIVERSITY 2020 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
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 3
A species of bird has a unique mating ritual where the male performs a complex courtship display to attract a female. What is the primary purpose of this display?
A. To establish dominance over other males
B. To demonstrate genetic fitness to the female
C. To signal the availability of food resources
D. To warn potential predators of the presence of the bird
Question 4
In the context of transport systems, 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 stomatal opening and clo\sing
D. To protect the plant from excessive sunlight
Question 5
A person has a blood type of AB and a Rh factor of positive. If the person's mother has a blood type of A and a Rh factor of negative, and the person's father has a blood type of B and a Rh factor of positive, what is the probability that the person's offspring will have a blood type of AB and a Rh factor of positive?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 6
In a coral reef e\cosystem, what is the primary mechanism by which coral polyps obtain essential nutrients?
A. Photosynthesis and transpiration
B. Nutrient uptake through tentacles
C. Symbiotic relationship with zooxanthellae
D. Decomposition and nutrient cycling
Question 7
A 2.5 L solution of 0.1 M NaCl is diluted to 5 L. What is the new concentration of NaCl?
A. 0.02 M
B. 0.05 M
C. 0.1 M
D. 0.2 M
Question 8
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 9
A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
C. Retina
D. Lens
Question 10
Which of the following organs is responsible for the production of hormones that regulate growth and development?
A. Pituitary gland
B. Thyroid gland
C. Adrenal gland
D. Pancreas
Question 11
In the context of evolutionary theories, what is the primary mechanism by which natural selection acts on populations?
A. Genetic drift
B. Mutation
C. Gene flow
D. Differential reproduction
Question 12
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 13
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 14
A geneticist is studying the inheri\tance of a particular trait in a population of pea plants. The trait is controlled by a \single gene with two alleles: R (dominant) and r (recessive). If a plant has the genotype Rr, what is the probability that it will express the dominant trait?
A. 0.5
B. 0.75
C. 0.25
D. 0.33
Question 15
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

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: