POST UTME ACHIEVERS UNIVERSITY 2018 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The human eye has a unique structure that allows it to detect light and transmit signals to the brain. Which of the following parts of the eye is responsible for focu\sing light onto the retina?
A. Cornea
B. Iris
C. Lens
D. Retina
Question 2
A diagram of a human respiratory system is shown below. Identify the part labeled 'A'.
A. Lungs
B. Trachea
C. Diaphragm
D. Bronchi
Question 3
The human body has a unique system that regulates the amount of water in the body. This system is responsible for maintaining the balance of fluids within the body. What is the name of this system?
A. Nervous System
B. Circulatory System
C. Digestive System
D. Endocrine System
Question 4
The human body has a unique system that regulates the amount of water in the body. This system is responsible for maintaining the balance of fluids within the body. What is the name of this system?
A. Nervous System
B. Circulatory System
C. Digestive System
D. Endocrine System
Question 5
A plant has a root system with a taproot and a fibrous root system. Which of the following is a characteristic of the fibrous root system?
A. It has a \single main root.
B. It has multiple smaller roots.
C. It has a main root and smaller roots.
D. It has no roots.
Question 6
The process of evolution involves the change in the frequency of alleles in a population over time. Which of the following best describes the mechanism by which natural selection acts on a population?
A. Natural selection acts on the frequency of alleles in a population by favoring individuals with advantageous traits.
B. Natural selection acts on the frequency of alleles in a population by favoring individuals with disadvantageous traits.
C. Natural selection acts on the frequency of alleles in a population by randomly selecting individuals.
D. Natural selection acts on the frequency of alleles in a population by selecting individuals based on their social status.
Question 7
A 0.5 M solution of NaCl is prepared by dissolving 0.5 mol of NaCl in 1 L of water. What is the concentration of the solution in g/L?
A. 20 g/L
B. 29.22 g/L
C. 40 g/L
D. 50 g/L
Question 8
In a tropical rainforest, the primary consumers are primarily herbivores that feed on the abundant vegetation. Which of the following best describes the relationship between the primary consumers and the producers in this e\cosystem?
A. Decomposers break down dead plants and animals into nutrients that are reused by the producers.
B. Primary consumers are herbivores that feed on the producers, while secondary consumers are carnivores that feed on the primary consumers.
C. The producers are plants that undergo photosynthesis to produce their own food, while the primary consumers are animals that feed on the producers.
D. The primary consumers are detritivores that feed on dead plants and animals, while the producers are plants that undergo photosynthesis.
Question 9
The process of cellular respiration involves the breakdown of glu\cose to produce energy in the form of ATP. Which of the following best describes the overall equation for cellular respiration?
A. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP \)
B. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O \)
C. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + 36ATP \)
D. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + 2ATP \)
Question 10
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the Hardy-Weinberg principle is applied, what is the frequency of the homozygous dominant genotype 'AA'?
A. 0.36
B. 0.64
C. 0.8
D. 0.16
Question 11
In asexual reproduction, what is the primary mechanism by which genetic variation is introduced into a population?
A. Mutation
B. Genetic drift
C. Gene flow
D. Genetic recombination
Question 12
In a eukaryotic cell, the Golgi apparatus is responsible for ______.
A. protein synthesis
B. cell signaling
C. protein modification and transport
D. cell division
Question 13
A community eco\logist is studying the trophic levels of a food web. Which of the following organisms would most likely be a primary consumer?
A. Grass
B. Mouse
C. Snake
D. Eagle
Question 14
A cell has a membrane potential of -70 mV. If the cell is stimulated with a depolarizing current, what is the new membrane potential?
A. -50 mV
B. -70 mV
C. -80 mV
D. -90 mV
Question 15
The process of diffusion is an example of ______.
A. active transport
B. passive transport
C. osmosis
D. facilitated diffusion

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