POST UTME ACHIEVERS UNIVERSITY 2023 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A neuron has a resting membrane potential of -70mV. If the neuron is stimulated by a neurotransmitter, what is the minimum change in membrane potential required for the neuron to fire?
A. 10mV
B. 20mV
C. 30mV
D. 40mV
Question 2
The process of respiration in cells involves the breakdown of glu\cose to produce energy. Which of the following is a byproduct of cellular respiration?
A. Carbon dioxide
B. Water
C. Glu\cose
D. Oxygen
Question 3
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. Which of the following is a necessary condition for the Hardy-Weinberg principle to hold?
A. Random mating
B. No mutation
C. No gene flow
D. No natural selection
Question 4
The classification of living things is based on the following characteristics. Which one is NOT a characteristic of the kingdom Animalia?
A. Multicellularity
B. Cell wall
C. Skeletal system
D. Nervous system
Question 5
In the context of evolutionary theories, what is the primary mechanism by which genetic drift leads to the loss of genetic variation in a population?
A. Genetic drift is a random process that occurs when a small population is isolated from the rest of the species.
B. Genetic drift leads to the loss of genetic variation because it causes the population to become more homogeneous.
C. Genetic drift is a deterministic process that occurs when a population is subject to strong selective pressure.
D. Genetic drift is a process that occurs when a population is exposed to environmental stressors.
Question 6
The transport of subs\tances in plants occurs through the xylem and phloem tissues. Which of the following is a function of the xylem?
A. Transport of water and minerals
B. Transport of sugars and amino acids
C. Transport of gases
D. Transport of waste products
Question 7
The human body is composed of various systems. Which system is responsible for the regulation of body temperature?
A. Nervous system
B. Circulatory system
C. Respiratory system
D. Endocrine system
Question 8
A population of birds is divided into two groups, one with a beak length of 10mm and the other with a beak length of 20mm. If the population size is 1000 birds, and the beak length is determined by a \single gene with two alleles (B and b), what is the probability that a bird with a beak length of 10mm will mate with a bird with a beak length of 20mm?
A. 0.5
B. 0.25
C. 0.75
D. 0.1
Question 9
The classification of living things is based on the concept of taxonomy. Which of the following is a level of classification?
A. Domain
B. Kingdom
C. Phylum
D. Species
Question 10
The diagram below shows the structure of the human eye. Which part is responsible for detecting light?
A. Cornea
B. Iris
C. Retina
D. Optic nerve
Question 11
In the process of excretion, the kidneys filter waste products from the blood and excrete them in the urine. Which of the following is a mechanism by which the kidneys regulate the concentration of ions in the blood?
A. Countercurrent exchange
B. Reabsorption
C. Secretion
D. Filtration
Question 12
A plant has a genotype of BB and a phenotype of tall. If the plant is crossed with a plant that has a genotype of bb and a phenotype of short, what is the probability that the offspring will have a phenotype of tall?
A. 0.5
B. 0.25
C. 0.75
D. 0.1
Question 13
A human eye has a re\fractive index of 1.33. If the wavelength of light is 500nm, what is the critical angle of the eye?
A. 20°
B. 30°
C. 40°
D. 50°
Question 14
The growth and development of an organism is influenced by the following factors. Which one is NOT a factor of growth?
A. Hormones
B. Nutrients
C. Genetics
D. Gravity
Question 15
The diagram below shows the structure of a plant cell. Which part is responsible for photosynthesis?
A. Cell wall
B. Cytoplasm
C. Vacuole
D. Chloroplast

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