Biology 2005 Jamb Examination
Question 11
The blackfly is a vector of
C. onchocerciasis
The blackfly transmits onchocerciasis (river blindness).
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Question 12
The transition from amphibians to mammals involves the limb becoming arranged to support the weight more effectively requiring modifications in the
B. pectoral and pelvic girdles
These girdles were modified to support body weight more effectively during the transition from amphibians to mammals.
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Question 13
The main function of the caudal fin in Tilapia is to
A. propel it forward in water
The caudal fin in Tilapia is primarily used for forward propulsion.
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Question 14
In the root vascular system, the stele is directly surrounded by the
C. endodermis
In the root, the stele (vascular cylinder) is directly surrounded by the endodermis.
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Question 15
From the diagram above the part labelled IV represents the
D. duodenum
The duodenum, the first part of the small intestine, plays a crucial role in digestion and nutrient absorption, receiving partially digested food from the stomach and mixing it with bile and pancreatic enzymes to further break down nutrients before absorption begins.Â
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Question 16
From the diagram above, The bile is stored in the part labelled
B. II
Bile, produced by the liver, is stored in the gallbladder, a small, pear-shaped organ located beneath the liver.Â
The gall bladder is the part labelled II.
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Question 17
The only vein that carriers pure oxygenated blood is the
B. pulmonary vein
The pulmonary vein is the only vein that carries oxygenated blood from the lungs to the heart.
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Question 18
The function of the fluid - filled pericadium is to
A. reduce the friction caused by the pumping movements of the heart
The fluid-filled pericardium acts as a lubricant, minimizing friction as the heart beats.
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Question 19
The mammalian lung is made air tight by the
C. pleural membrane
The pleural membrane encloses the lungs and makes them air-tight, preventing air leakage during breathing.
The pleura is a thin, moist membrane that envelops each lung and lines the inner surfaces of the chest wall and diaphragm.
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Question 20
A test tube containing yeast in glucose solution containing alkaline pyrogallol. The bubbles of carbon (IV) oxide produced indicates that the yeast cells are
A. respiring in the absence of oxygen
Yeast cells can respire both aerobically and anaerobically. In the setup described, alkaline pyrogallol is present. This chemical readily absorbs oxygen from the solution, creating an environment without free oxygen. Since the yeast is placed in a glucose solution with no oxygen available, it switches to anaerobic respiration (fermentation). During this process, glucose is broken down to produce ethanol and carbon (IV) oxide (COâ‚‚). The bubbles observed in the test tube are therefore proof that the yeast is alive and actively respiring in the absence of oxygen, producing COâ‚‚ as a byproduct of fermentation.