POST UTME ACHIEVERS UNIVERSITY 2019 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
A. Cell wall
B. Vacuole
C. Nucleus
D. Mitochondria
Question 2
The concept of convergent evolution refers to the process by which different species develop similar traits in response to similar environmental pressures. Which of the following examples illustrates convergent evolution?
A. The development of wings in birds and insects
B. The development of limbs in vertebrates
C. The development of eyes in vertebrates and cephalopods
D. The development of fins in fish and whales
Question 3
A plant cell has a cell wall, a large central vacuole, and a small nucleus. Which of the following organelles is NOT found in plant cells?
A. Mitochondria
B. Chloroplasts
C. Lysosomes
D. Centrioles
Question 4
A 2.0 g sample of glu\cose (C6H12O6) is burned in a combustion reaction. If the heat of combustion is 2800 kJ/mol, what is the energy released per gram of glu\cose?
A. 1.4 kJ/g
B. 2.8 kJ/g
C. 4.2 kJ/g
D. 5.6 kJ/g
Question 5
A 0.5 M solution of HCl is mixed with a 0.5 M solution of NaOH. What is the pH of the resulting solution?
A. 1
B. 7
C. 10
D. 14
Question 6
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 7
A population of rabbits is introduced to a new island. The population grows exponentially, with a doubling time of 2 years. What is the expected population size after 10 years?
A. 1024
B. 2048
C. 4096
D. 8192
Question 8
A plant's xylem is responsible for transporting water and minerals from the roots to the leaves. What is the primary mechanism by which this occurs?
A. Transpiration pull
B. Root pressure
C. Capillary action
D. Osmosis
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. 0.16
B. 0.36
C. 0.64
D. 0.84
Question 10
The human nervous system is composed of two main types of neurons: sensory neurons and motor neurons. What is the primary function of sensory neurons?
A. To transmit signals from sensory receptors to the central nervous system
B. To transmit signals from the central nervous system to muscles and glands
C. To regulate the body's internal environment
D. To produce hormones
Question 11
A 25-year-old male patient presents with symptoms of fatigue, weakness, and shortness of breath. His hemoglobin level is 8 g/dL. Which of the following is the most likely cause of his anemia?
A. Iron deficiency anemia
B. Vitamin deficiency anemia
C. Sickle cell anemia
D. Thalassemia
Question 12
Asexual reproduction in plants can occur through the production of
A. Seeds
B. Spores
C. Buds
D. Rhizomes
Question 13
The growth of a population can be described by the \logistic equation \( \frac{dN}{dt} = rN left\( 1 - \frac{N}{K} \right \ \) ). What is the carrying capacity of the population?
A. K
B. r
C. N
D. t
Question 14
A plant has a genotype of 'Rr' for the flower color gene. If the plant is self-pollinated, 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 15
A population of Drosophila melanogaster has a genetic mutation that affects the expression of the white gene. The mutation results in a 50% reduction in the production of the white protein. What is the expected phenotype of the F1 generation?
A. White-eyed
B. Normal-eyed
C. Variegated-eyed
D. Enhanced-eyed

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