All 24 questions from the Post-UTME Screening (Post-UTME) Biology 2011 Objective paper, with the correct answer and a full explanation for each. Free, no signup needed.
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Which of the following levels of organization in things is in correct sequence, starting from the most complex to the simplest?
From most to least complex: system, organ, tissue, cell.
A few drops of Fehling's solution were added to extract from fresh maize grain and a red precipitate was formed, indicating the presence of
A positive Fehling's test (red/brick precipitate) indicates the presence of a reducing sugar. Flagged: the scan's printed option read 'non-reducing sugar', which is likely a transcription/printing slip, since Fehling's test specifically detects reducing sugars.
Which of the following is NOT an organelle?
Fat droplets are storage inclusions, not membrane-bound cell organelles.
Which of the following are products of aerobic respiration?
Aerobic respiration of glucose produces water, carbon dioxide, and energy (ATP).
Movement of water across a permeable membrane from a weaker solution to a stronger solution is known as
Osmosis is the movement of water across a semi-permeable membrane from a region of lower solute concentration to higher solute concentration.
In which of the following structures can cells undergoing meiosis be seen?
Meiosis occurs in reproductive tissues such as the ovary (producing gametes), not in general growth tissues like root/stem apices.
Which of the following instruments is used to perform an experiment on geotropism?
A klinostat is used to study plant growth responses to gravity (geotropism) by continuously rotating the plant.
The thoracic vertebra differs from other vertebrae by the possession of
Thoracic vertebrae are characterised by long neural spines and facets for rib articulation; the odontoid process is specific to the axis, and the vertebrarterial canal is specific to cervical vertebrae.
The maintenance of a constant internal environment of an organism is known as
Homeostasis is the maintenance of a stable internal environment. (Note: this question is a near-duplicate of one found in the FUTO 2013/2014 Type D session in this same PDF set; the same independently-worked answer is used here.)
The most sensitive part of the retina is called
The fovea centralis has the highest density of cone cells, giving sharpest vision. (Note: this question is a near-duplicate of one found in the FUTO 2013/2014 Type D session in this same PDF set; the same independently-worked answer is used here.)
Which of the following substances is not a homogenous mixture?
Flood water typically contains visible suspended debris, making it heterogeneous. (Note: this question is a near-duplicate of one found in the FUTO 2013/2014 Type D session in this same PDF set; the same independently-worked answer is used here.)
There is a large temperature interval between the melting point and the boiling point of a metal because
Melting only loosens the lattice while metallic bonding persists; boiling requires complete separation of atoms, needing much more energy. (Note: this question is a near-duplicate of one found in the FUTO 2013/2014 Type D session in this same PDF set; the same independently-worked answer is used here.)
How many moles of (H+) are there in 1dm3 of 0.5M solution of H2SO4?
H2SO4 is diprotic. Moles H+ = 2 x 0.5 x 1 = 1.0 mole. (Note: this question is a near-duplicate of one found in the FUTO 2013/2014 Type D session in this same PDF set; the same independently-worked answer is used here.)
A given mass of gas occupies 2dm3 at 300K. At what temperature will its volume be doubled, keeping the pressure constant?
By Charles' law: 2/300 = 4/T2 => T2 = 600K. (Note: this question is a near-duplicate of one found in the FUTO 2013/2014 Type D session in this same PDF set; the same independently-worked answer is used here.)
If 100cm3 of oxygen pass through a porous plug in 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is
By Graham's law: t(H2) = 50 x sqrt(2/32) = 12.5s. (Note: this question is a near-duplicate of one found in the FUTO 2013/2014 Type D session in this same PDF set; the same independently-worked answer is used here.)
Which of the following is a measure of the average kinetic energy of the molecules of a substance?
Temperature directly reflects the average kinetic energy of a substance's molecules. (Note: this question is a near-duplicate of one found in the FUTO 2013/2014 Type D session in this same PDF set; the same independently-worked answer is used here.)
Four elements P, Q, R and S have 1, 2, 3, and 7 electrons in their outermost shells respectively. The element which is likely to be a metal is
Fewer outer-shell electrons (here, P with 1) makes an element more likely to lose electrons easily - a metallic property. (Note: this question is a near-duplicate of one found in the FUTO 2013/2014 Type D session in this same PDF set; the same independently-worked answer is used here.)
Which of the following gases dissolves in water vapour to produce acid rain during rainfall?
Sulphur (IV) oxide dissolves in atmospheric moisture to form acidic compounds, causing acid rain. (Note: this question is a near-duplicate of one found in the FUTO 2013/2014 Type D session in this same PDF set; the same independently-worked answer is used here.)
Water for town supply is chlorinated to make it free from
Chlorination primarily disinfects water by killing bacteria. (Note: this question is a near-duplicate of one found in the FUTO 2013/2014 Type D session in this same PDF set; the same independently-worked answer is used here.)
Which of the following physical processes cannot be explained by the molecular theory of matter?
Radiation of heat does not require molecules/a medium, unlike the other listed processes. (Note: this question is a near-duplicate of one found in the FUTO 2013/2014 Type D session in this same PDF set; the same independently-worked answer is used here.)
A spring balance which is suspended from the roof of a lift carries a mass of 1kg at its free end. If the lift accelerates upward at 2.5ms^-2, determine the reading on the spring balance. (g=10ms^-2)
Reading = m(g+a) = 1x(10+2.5) = 12.5N. (Note: this question is a near-duplicate of one found in the FUTO 2013/2014 Type D session in this same PDF set; the same independently-worked answer is used here.)
An object of weight 10N immersed in a liquid displaces a quantity of the liquid. If the liquid displaced weighs 6N, determine the up thrust on the object.
By Archimedes' principle, upthrust = weight of displaced liquid = 6N. (Note: this question is a near-duplicate of one found in the FUTO 2013/2014 Type D session in this same PDF set; the same independently-worked answer is used here.)
Which of the following statements about pressure is NOT correct? Pressure
Pressure = Force/Area, so pressure decreases (not increases) with increasing area; this statement is false. (Note: this question is a near-duplicate of one found in the FUTO 2013/2014 Type D session in this same PDF set; the same independently-worked answer is used here.)
A block weighing 15N rests on a flat surface and a horizontal force of 3N is exerted on it. Determine the frictional force on the block.
If stationary, static friction exactly balances the applied force: 3.0N. (Note: this question is a near-duplicate of one found in the FUTO 2013/2014 Type D session in this same PDF set; the same independently-worked answer is used here.)
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