All 19 questions from the Post-UTME Screening (Post-UTME) Biology 2012 Objective paper, with the correct answer and a full explanation for each. Free, no signup needed.
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Which of the following structures are present in both the epidermis and the dermis of the skin?
Hair follicles/shafts and sweat ducts pass through both the epidermis and dermis.
The number of individuals of a specie per unit area at a particular time is a
Population density is defined as the number of individuals of a species per unit area at a given time.
Cockroach has been found to carry germs of dangerous diseases such as
Cockroaches are known vectors of diseases including dysentery and typhoid fever (leprosy is included here as printed, though it is not typically cockroach-transmitted).
Which of the following glands secrete substance into the blood stream
Adrenal (endocrine) glands secrete hormones directly into the bloodstream, unlike the exocrine glands listed.
Which of the following substances from mother's blood diffuse through the placenta into the blood vessels of the foetus?
Glucose and oxygen diffuse from mother to foetus across the placenta; urea and CO2 diffuse the other way (foetus to mother).
Which of the following is not an abiotic factor
Predation is a biotic (organism-organism) interaction, not an abiotic (non-living) factor.
To form a ball and socket joint, the head of the humerus must fit into another structure in the scapula called the
The head of the humerus articulates with the glenoid cavity of the scapula to form the shoulder (ball-and-socket) joint.
Which of the following pairs of organelles are likely to be present in an active respiring and photosynthesizing cell?
Chloroplasts (photosynthesis) and mitochondria (respiration) are the organelles directly responsible for these two processes.
Spermatogenesis and Oogenesis are both terms used to describe
Both processes describe the formation of gametes (sperm and egg cells respectively), i.e. gametogenesis.
Which disease is sex-linked and mainly afflicts male offspring?
Haemophilia is a classic X-linked recessive condition, predominantly affecting males.
A genetic make-up of an organism is described as its
'Genotype' refers to an organism's genetic makeup/constitution.
During blood transfusion, agglutination may occur as a result of the reaction between
Agglutination (clumping) occurs when antibodies react against incompatible (contrasting) antigens on donor red blood cells.
Species can be defined as the group or organisms that
The biological species concept defines a species as a group capable of interbreeding freely to produce fertile offspring.
Which of the following represents the phenotypic ratio when a plant Rr is crossed with another plant Rr, assuming that the gene R for round seed is dominant and wrinkled r is recessive?
A monohybrid cross Rr x Rr gives a 3:1 phenotypic ratio (round:wrinkled).
The theory that new organs or characteristics develop in organisms when there is a need for them was postulated by
This is Lamarck's theory of adaptation through need and use.
Which of the following parts of the mammalian brain is involved in taking the decision to run rather than walk?
The cerebrum is responsible for conscious decision-making, including the choice to run rather than walk.
In testing for a reducing sugar, the food substance is usually warmed with
Benedict's solution is the standard reagent used to test for reducing sugars.
Which of the following statements about the circulation of blood is not correct?
Oxygenated blood LEAVES the lungs via the pulmonary vein (towards the heart); it does not 'enter the lungs' through this vessel - deoxygenated blood enters the lungs via the pulmonary artery.
The enzyme that acts on milk in the stomach is
Renin (rennin) is the stomach enzyme that curdles/acts on milk protein in infants.
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