All 20 questions from the Post-UTME Screening (Post-UTME) Biology 2015 Objective paper, with the correct answer and a full explanation for each. Free, no signup needed.
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Which of the following hormones is produced during fright or when agitated?
Adrenalin is released by the adrenal glands as part of the 'fight or flight' response to fright or agitation.
Which of the following animals is cold-blooded?
Lizards are reptiles, which are cold-blooded (poikilothermic); the other options are warm-blooded mammals/birds.
Spirogyra reproduces vegetatively by
Spirogyra, a filamentous alga, reproduces vegetatively by fragmentation of its filaments.
All of the following are digestive enzymes except
Bile is not an enzyme; it is a fluid that emulsifies fats to aid lipase action, secreted by the liver/stored in the gall bladder.
If a 26-year-old man marries a one-eyed woman and they have four children, how many of them would be blind like the father?
The father is not described as blind or one-eyed, so no children would be 'blind like the father' - this is a trick/riddle question with answer 'none'.
A tapeworm has no alimentary canal because
Tapeworms live in a nutrient-rich host gut and absorb pre-digested food directly through their body surface, so they have no need for an alimentary canal.
Where is energy produced in the cell?
Mitochondria are the sites of aerobic respiration (ATP/energy production) in the cell.
Which of the following structures is NOT found in a female agama lizard?
Chloroplasts are plant organelles used for photosynthesis and are not found in any animal, including lizards.
Which of the following diseases is NOT caused by a virus?
Maize rust is caused by a fungus, unlike the other listed diseases which are viral.
Plants which can survive in places where the water supply is limited are
Xerophytes are plants adapted to survive in dry/water-scarce environments.
Production of the viviparous seedling is an adaptive feature of
Mangrove plants (like Rhizophora) produce viviparous seedlings that germinate while still attached to the parent plant, an adaptation to their unstable, saline, waterlogged habitat.
In which of the following zones of the marine habitat is the intensity of light at its minimum?
The benthic zone, at the sea floor, receives the least light of the listed zones, as it is furthest from the surface.
An ample of aquatic plants which live completely submerged in water is the
Ceratophyllum (hornwort) is a fully submerged aquatic plant, unlike Pistia and Salvinia (floating) or Typha (emergent).
Which of the following plants is most adapted to the grassland ecosystem?
The baobab tree is characteristically adapted to savanna/grassland ecosystems, with features suited to seasonal drought.
In a normal succession, species diversity
As ecological succession proceeds towards a climax community, species diversity generally increases.
In an experiment, the following results were obtained: I. Original weight of soil = x g, II. Weight of oven dried soil = y g, III. Weight of humus in soil = z g. The percentage of water in the soil is therefore given by the expression
The water lost on oven-drying is (x-y). Expressed as a percentage of the original soil weight (x), the percentage of water = (x-y)/x x 100.
The best method of preventing leaching is
Planting cover crops helps bind the soil and reduce the movement of water through it, minimising the leaching of nutrients.
In Nigeria, the organization responsible for the control of all aspects of population is the
Population-related health matters in Nigeria fall under the purview of the Federal Ministry of Health.
In the human body, blood fluke inhabits the
Schistosoma haematobium, the urinary blood fluke, inhabits the veins around the bladder, causing urinary schistosomiasis.
The clearing away of plants from water banks and draining off water collections are control measures targeted towards the eradication of
Clearing vegetation from water banks and draining stagnant water removes the habitat of the snail intermediate host of Schistosoma, helping control schistosomiasis.
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