POST UTME OAU 2020 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The process of digestion in the human body involves the breakdown of food into smaller molecules through the action of enzymes, which are produced by the
A. Salivary Glands
B. Pancreas
C. Small Intestine
D. Liver
Question 2
A plant's xylem tissue is responsible for transporting water and minerals from the roots to the leaves. What is the primary mechanism by which water is transported through the xylem?
A. Transpiration Pull
B. Root Pressure
C. Capillary Action
D. Osmosis
Question 3
In the context of photosynthesis, what is the role of the enzyme RuBisCO?
A. It catalyzes the conversion of CO2 to glu\cose
B. It regulates the amount of ATP produced during photosynthesis
C. It is responsible for the light-dep\endent reactions
D. It is involved in the Calvin cycle
Question 4
A diagram of a plant's root system is shown below. Which of the following structures is responsible for the absorption of water and minerals from the soil?
A. Stomata
B. Xylem
C. Phloem
D. Root hairs
Question 5
In the context of evolutionary theories, what is the primary mechanism driving the adaptation of populations to changing environments?
A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation
Question 6
The diagram below represents a cross between two true-breeding lines of Drosophila melanogaster. What is the probability that a progeny will be homozygous dominant?
A. 0.25
B. 0.5
C. 0.75
D. 1
Question 7
The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of
A. Glu\cose and Oxygen
B. Starch and Carbon Dioxide
C. Protein and Water
D. Fat and Nitrogen
Question 8
In the context of osmoregulation, what is the primary function of the kidneys in a desert-dwelling organism?
A. To conserve water by reabsorbing water from the filtrate
B. To excrete excess salt by producing a highly concentrated urine
C. To regulate electrolyte balance by adjusting the amount of ions in the urine
D. To maintain acid-base balance by adjusting the pH of the urine
Question 9
In a eukaryotic cell, the process of photosynthesis occurs in the mitochondria.
A. True
B. False
C. It occurs in the chloroplasts
D. It occurs in the nucleus
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?
A. 0.36
B. 0.64
C. 0.16
D. 0.84
Question 11
The excretory system in humans consists of the kidneys, ureters, bladder, and urethra, which work together to remove waste and excess fluids from the body through the process of
A. Osmoregulation
B. Excretion
C. Respiration
D. Circulation
Question 12
The sense organ responsible for detecting changes in light intensity is the
A. Eye
B. Ear
C. Nose
D. Tongue
Question 13
A plant has a genotype of 'Tt' for the trait 'flower color'. If the plant is crossed with a plant having the genotype 'Tt', what is the probability that the offspring will have the genotype 'TT'?
A. 0.25
B. 0.5
C. 0.75
D. 0.33
Question 14
The following graph represents the relationship between the concentration of a substrate and the rate of enzyme activity. What is the order of the reaction?
A. First order
B. Second order
C. Zero order
D. Third order
Question 15
The excretory system in humans is responsible for removing waste products from the body. Which of the following organs plays a crucial role in the excretion of urea?
A. Kidneys
B. Liver
C. Lungs
D. Skin

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