POST UTME LEAD CITY UNIVERSITY 2018 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
What is the primary function of the sense organ responsible for detecting changes in light intensity?
A. To regulate the opening and clo\sing of stomata
B. To control the rate of photosynthesis
C. To detect changes in light intensity and regulate plant growth
D. To produce sugars through photosynthesis
Question 2
What is the primary function of the digestive enzyme pep\sin?
A. To break down proteins into smaller peptides
B. To regulate the rate of cell growth
C. To produce sugars through photosynthesis
D. To detect changes in light intensity and regulate plant growth
Question 3
In a tropical rainforest, the presence of a large number of epiphytes is an example of a(n) _______ relationship between the epiphytes and their host plants.
A. mutualism
B. commensalism
C. parasitism
D. competition
Question 4
The process of digestion in the human body involves the breakdown of food into smaller molecules that can be absorbed and utilized by the body. Which of the following enzymes is responsible for breaking down proteins in the stomach?
A. Pep\sin
B. Lactase
C. Amylase
D. Tryp\sin
Question 5
The process by which plants convert light energy into chemical energy is called _______
A. photosynthesis
B. respiration
C. transpiration
D. translocation
Question 6
The diagram below shows the structure of a plant root.
A. The xylem is responsible for transporting water and minerals.
B. The phloem is responsible for transporting sugars and amino acids.
C. The root hair cells are responsible for absorbing water and minerals.
D. The root cap is responsible for protecting the root tip.
Question 7
The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of glu\cose. Which of the following is a by-product of this process?
A. Oxygen
B. Carbon dioxide
C. Water
D. Nitrogen
Question 8
The process by which an organism's genetic information is passed from one generation to the next is called _______
A. heredity
B. variation
C. mutation
D. genetics
Question 9
The process of digestion in the human body involves the breakdown of food into smaller molecules. Which of the following enzymes is responsible for breaking down proteins?
A. Amylase
B. Lipase
C. Tryp\sin
D. Lactase
Question 10
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. 0.48
D. 0.16
Question 11
The diagram below shows the structure of a neuron.
A. The axon is responsible for transmitting signals away from the cell body.
B. The d\endrite is responsible for receiving signals from other neurons.
C. The cell body is responsible for producing proteins and organelles.
D. The myelin sheath is responsible for insulating the axon.
Question 12
A 5.0 g sample of a subs\tance is heated to 100°C. If the subs\tance undergoes a phase change, what is the energy required to change the subs\tance from solid to liquid?
A. 10 kJ/mol
B. 20 kJ/mol
C. 30 kJ/mol
D. 40 kJ/mol
Question 13
The process of osmoregulation in bacteria involves the transport of ions across the cell membrane. Which of the following transport mechanisms is primarily responsible for maintaining the osmotic balance in E. coli?
A. Proton motive force
B. Potassium-sodium antiporter
C. Glu\cose symporter
D. ATP-dep\endent pumps
Question 14
The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of glu\cose. Which of the following is a by-product of photosynthesis?
A. Oxygen
B. Carbon dioxide
C. Water
D. Nitrogen
Question 15
A population of rabbits is growing at a rate of 20% per year. If the initial population is 100 rabbits, what will be the population after 3 years?
A. 160
B. 180
C. 200
D. 220

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