All 20 questions from the Post-UTME Screening (Post-UTME) Biology 2017 Objective paper, with the correct answer and a full explanation for each. Free, no signup needed.
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A plant which grows on another plant without apparent harm to the host plant is called
An epiphyte grows on another plant for physical support only, without taking nutrients from (harming) it.
Which of these types of skeleton is most appropriate to the cockroach?
Cockroaches, like other insects/arthropods, have a hard external exoskeleton.
Which of these is NOT true of the insect? The possession of
Insects have only ONE pair of antennae, not two, making this statement false (i.e. the correct answer to 'which is not true').
All living things
Respiration is a universal characteristic of all living things, unlike photosynthesis, movement, or transpiration.
A secchi disc is used in the determination of
A secchi disc measures water transparency/turbidity.
Which of the following is NOT an excretory product?
Faeces result from egestion of undigested food, not excretion of metabolic waste, so it is not a true excretory product.
Which of the following organs produces bile?
Bile is produced by the liver and stored in the gall bladder.
Which of the following food substances is NOT digested in the stomach?
Carbohydrate digestion begins in the mouth (salivary amylase) and continues in the small intestine; little/no carbohydrate digestion occurs in the stomach.
For pollination and fruit formation, essential part(s) of the flower should include
The pistil (gynoecium), containing the ovary, style and stigma, is essential for pollination and subsequent fruit formation.
Which part of the human brain is concerned with reflexes controlling the rate of heart beat and breathing?
The medulla oblongata controls involuntary/reflex functions including heart rate and breathing.
The cells responsible for the secretion of insulin in the human body are called
The islets of Langerhans, found in the pancreas, contain the beta cells that secrete insulin.
The endocrine gland responsible for the production of antidiuretic hormone is the
Antidiuretic hormone (ADH/vasopressin) is produced by the hypothalamus and released by the posterior pituitary gland.
Which of the following groups of characteristics best describes an ecosystem?
An ecosystem is best characterised by species diversity, stability, energy flow through trophic levels, and cycling of materials/nutrients.
An organism's abode in its specific biotic community constitutes its
An organism's habitat is the specific physical place/abode where it lives within its community.
The measurement of turbidity in a eutrophic pond is done by using a
A secchi disc is a simple tool lowered into water to measure water clarity/turbidity based on the depth at which it disappears from view.
Which of the following ecological factors is limited to the aquatic habitat?
Salinity (salt concentration) is a factor specific to aquatic (particularly marine/brackish) habitats.
Use the food web below (E -> G -> J -> M) to answer this question and the next. In the food chain E -> G -> J -> M, the least energy is found in
Energy decreases progressively along a food chain; the top (final) consumer, M, has the least available energy, as most is lost at each preceding trophic transfer.
The trophic levels occupied by organisms K are
Where an organism feeds at more than one level in a food web, it can occupy multiple trophic levels; here K is placed at the 2nd and 4th levels per the source diagram.
Cactus is an example of a
Cacti are adapted to survive in dry (arid) conditions, making them classic xerophytes.
In which of the following biotic communities are lianas very common?
Lianas (woody climbing vines) are especially common in tropical rain forests, where they climb up trees to reach sunlight in the canopy.
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