Biology 2011 Jamb Examination
Biology 2011 Jamb Examination
Question 11
I. Parasitism → Sundew. ll. Autotrophism →Amoeba. III. Saprophytism → Alga. IV Heterotrophism → Agama.
Which of the above modes of nutrition is correctly matched with the organism that exhibits it?
Sundew is a carnivorous plant (autotroph with carnivory), Amoeba is heterotrophic, Alga is autotrophic, and Agama (a lizard) is heterotrophic. Only IV (Heterotrophism → Agama) is correctly matched.
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Question 12
Use the following information to answer the question below.
I. Test tube containing cane sugar and water . ll. Test tube containing cane sugar and diluted acid. III. Test tube containing cane sugar and its degrading enzyme .
In which of the test tubes will glucose be detected after complete hydrolysis?
Cane sugar (sucrose) is not hydrolysed by water alone. Diluted acid hydrolyses sucrose to glucose and fructose; a degrading enzyme specific for sucrose (sucrase) will also hydrolyse it. Therefore glucose will be detected in test tubes II and III only.
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Question 13
Use the following information to answer the question below.
I. Test tube containing cane sugar and water .
ll. Test tube containing cane sugar and diluted acid.
III. Test tube containing cane sugar and its degrading enzyme .
The enzyme involved in the hydrolysis is
I. Test tube containing cane sugar and water .
ll. Test tube containing cane sugar and diluted acid.
III. Test tube containing cane sugar and its degrading enzyme .
The enzyme involved in the hydrolysis is
The enzyme that hydrolyses sucrose (cane sugar) into glucose and fructose is sucrase (also called invertase). Rennin acts on milk, erepsin on peptides, and maltase on maltose.
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Question 14
The part of the mammalian ear responsible for the maintenance of balance is the
The vestibular system (semicircular canals and vestibule) contains sensory structures that detect head position and motion, maintaining balance. The cochlea is for hearing, pinna collects sound, and perilymph is fluid.
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Question 15
The path followed by air as it passes through the lungs in mammals is
Air flows from the trachea into the bronchi, then into smaller bronchioles and finally into alveoli where gas exchange occurs. Option A correctly lists this sequence.
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Question 16
The movement response of a cockroach away from a light source can be described as
Movement away from a light source is negative phototaxis (or phototaxism). Phototropism refers to growth responses in plants, not movement of animals.
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Question 17
The vascular tissues in higher plants are responsible for
Xylem and phloem (vascular tissues) transport water, minerals and food (sugars) throughout the plant—movement of both food and water is their primary role.
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Question 18
Which of the following organs regulates the levels of water, salts , hydrogen ions and urea in the mammalian blood?
The kidney regulates water balance, electrolyte (salt) levels, hydrogen ion concentration (acid–base balance) and removes nitrogenous wastes such as urea from the blood.
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Question 19
The sequence of the one-way gaseous exchange mechanism in a fish is
Water enters the mouth, passes over the gills where gas exchange occurs, and exits via the operculum—so the sequence is mouth → gills → operculum.
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Question 20
The type of asexual reproduction that is common to both Paramecium and protists is
Paramecium reproduces asexually by binary fission; many protists also reproduce by fission. Budding, sporulation and fragmentation occur in other organisms but fission is common here.
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