Biology, 2018, JAMB Exam, Exam, Paper 1 | Objectives

Paper Info

Year :

2018

Title :

Biology

Exam :

JAMB Exam

Paper 1 | Objectives

71 - 80 of 90 Questions

#	Question	Ans
71.	The energy released by 1 gram of glucose is A. 6 kcal B. 4 kcal C. 5 kcal D. 3 kcal Show Content Detailed Solution Protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram There is an explanation video available below.	B
72.	What is the function of trichocyst in paramecium A. Movement B. Defence C. Excretion D. Respiration Show Content Detailed Solution Trichocyst, a structure in the cortex of certain ciliate and flagellate protozoans consisting of a cavity and long, thin threads that can be ejected in response to certain stimuli. Trichocysts may be widely distributed over an organism or restricted to certain areas (e.g., tentacles, papillae, around the mouth). It is also a structure in the cortex of certain ciliate and flagellate protozoans consisting of a cavity and long, thin threads that can be ejected in response to certain stimuli There is an explanation video available below.	B
73.	Man can contact tapeworm through A. ingesting uncooked meat B. from fish C. from breathing D. through contact Show Content Detailed Solution A cysticercus can survive for several years in the animal. Humans become infected by ingesting raw or undercooked infected meat it can be contacted through ingesting uncooked meat There is an explanation video available below.	A
74.	An example of a radially symmetrical organisms is A. Planaria B. Hydra C. Tapeworm D. Roundworm Show Content Detailed Solution An animal with radial symmetry really has no right and left side or head and rear end. This animals do not move, so they can reach into their environment on all sides. Starfish is an example of radial symmetry. They can be attached to a substrate, like the sea anemone, or floating, like jellyfish. It also occurs in simple animals including the aquatic cnidarians, which include hydra, corals, jellyfish and sea anemones, and Ctenophora, which are comb jellies. One of the common traits amongst the cnidarians is their symmetry. Hydras, like all cnidarians, display radial symmetry. There is an explanation video available below.	B
75.	Maltose is combination of glucose and A. glucose B. sucrose C. Galactose D. fructose Show Content Detailed Solution Maltose is composed of two molecules of glucose There is an explanation video available below.	A
76.	The vitamin which is important in the formation of the retina pigment is A. Vitamin A B. Vitamin B C. Vitamin C D. Vitamin D Show Content Detailed Solution Vitamin A is a group of unsaturated nutritional organic compounds that includes retinol, retinal, retinoic acid, and several pro-vitamin A carotenoids (most notably beta-carotene). Vitamin A has multiple functions: it is important for growth and development, for the maintenance of the immune system and good vision. Vitamin A that is important in the production of visual pigment There is an explanation video available below.	A
77.	In the egg of a bird, the embryo is located in the A. Chalaza B. Yolk C. Albumen D. Airspace Show Content Detailed Solution Special temporary organs or embryonic membranes form within the egg, both to protect the embryo and to provide for its nutrition, respiration, and excretion. These organs include the yolk sac. The yolk sac is also responsible for the initial circulation and is in charge of delivering nutrients, via a primitive aorta, to the developing embryo through a process called vitelline circulation. There is an explanation video available below.	B
78.	The greatest amount of energy would be obtained by the Oxidation of 100kg of A. Meat B. Butter C. Sugar D. Biscuit Show Content Detailed Solution Butter is about 80% fat, and the rest is mostly water and each gram of fat provides twice as much energy as carbohydrate or protein. It is very high in saturated (about 70%) fatty acids, and contains a fair amount of monounsaturated fatty acids (about 25%). The most abundant chemical in meat is water followed by protein then fat. Carbohydrates, minerals and vitamins occur on much smaller amounts but nevertheless are very important metabolically and nutritionally There is an explanation video available below.	B
79.	Ozone hole refers to A. hole in ozone layer B. decrease in the ozone layer in troposphere C. decrease in thickness of ozone layer in stratosphere D. increase in the thickness of ozone layer in troposphere Show Content Detailed Solution Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. There is an explanation video available below.	C
80.	Accessory material in a chicken egg include the following except A. Albumen B. Shell membrane C. Shell D. Germinal disc Show Content Detailed Solution General: Germinal disk (blastoderm) -- a small, circular, white spot (2-3 mm across) on the surface of the yolk; it is where the sperm enters the egg. The nucleus of the egg is in the blastodisc. The embryo develops from this disk, and gradually sends blood vessels into the yolk to use it for nutrition as the embryo develops A small mass of active protoplasm found directly under the vitelline membrane There is an explanation video available below.	D

71.	The energy released by 1 gram of glucose is A. 6 kcal B. 4 kcal C. 5 kcal D. 3 kcal Show Content Detailed Solution Protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram There is an explanation video available below.	B
72.	What is the function of trichocyst in paramecium A. Movement B. Defence C. Excretion D. Respiration Show Content Detailed Solution Trichocyst, a structure in the cortex of certain ciliate and flagellate protozoans consisting of a cavity and long, thin threads that can be ejected in response to certain stimuli. Trichocysts may be widely distributed over an organism or restricted to certain areas (e.g., tentacles, papillae, around the mouth). It is also a structure in the cortex of certain ciliate and flagellate protozoans consisting of a cavity and long, thin threads that can be ejected in response to certain stimuli There is an explanation video available below.	B
73.	Man can contact tapeworm through A. ingesting uncooked meat B. from fish C. from breathing D. through contact Show Content Detailed Solution A cysticercus can survive for several years in the animal. Humans become infected by ingesting raw or undercooked infected meat it can be contacted through ingesting uncooked meat There is an explanation video available below.	A
74.	An example of a radially symmetrical organisms is A. Planaria B. Hydra C. Tapeworm D. Roundworm Show Content Detailed Solution An animal with radial symmetry really has no right and left side or head and rear end. This animals do not move, so they can reach into their environment on all sides. Starfish is an example of radial symmetry. They can be attached to a substrate, like the sea anemone, or floating, like jellyfish. It also occurs in simple animals including the aquatic cnidarians, which include hydra, corals, jellyfish and sea anemones, and Ctenophora, which are comb jellies. One of the common traits amongst the cnidarians is their symmetry. Hydras, like all cnidarians, display radial symmetry. There is an explanation video available below.	B
75.	Maltose is combination of glucose and A. glucose B. sucrose C. Galactose D. fructose Show Content Detailed Solution Maltose is composed of two molecules of glucose There is an explanation video available below.	A

76.	The vitamin which is important in the formation of the retina pigment is A. Vitamin A B. Vitamin B C. Vitamin C D. Vitamin D Show Content Detailed Solution Vitamin A is a group of unsaturated nutritional organic compounds that includes retinol, retinal, retinoic acid, and several pro-vitamin A carotenoids (most notably beta-carotene). Vitamin A has multiple functions: it is important for growth and development, for the maintenance of the immune system and good vision. Vitamin A that is important in the production of visual pigment There is an explanation video available below.	A
77.	In the egg of a bird, the embryo is located in the A. Chalaza B. Yolk C. Albumen D. Airspace Show Content Detailed Solution Special temporary organs or embryonic membranes form within the egg, both to protect the embryo and to provide for its nutrition, respiration, and excretion. These organs include the yolk sac. The yolk sac is also responsible for the initial circulation and is in charge of delivering nutrients, via a primitive aorta, to the developing embryo through a process called vitelline circulation. There is an explanation video available below.	B
78.	The greatest amount of energy would be obtained by the Oxidation of 100kg of A. Meat B. Butter C. Sugar D. Biscuit Show Content Detailed Solution Butter is about 80% fat, and the rest is mostly water and each gram of fat provides twice as much energy as carbohydrate or protein. It is very high in saturated (about 70%) fatty acids, and contains a fair amount of monounsaturated fatty acids (about 25%). The most abundant chemical in meat is water followed by protein then fat. Carbohydrates, minerals and vitamins occur on much smaller amounts but nevertheless are very important metabolically and nutritionally There is an explanation video available below.	B
79.	Ozone hole refers to A. hole in ozone layer B. decrease in the ozone layer in troposphere C. decrease in thickness of ozone layer in stratosphere D. increase in the thickness of ozone layer in troposphere Show Content Detailed Solution Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. There is an explanation video available below.	C
80.	Accessory material in a chicken egg include the following except A. Albumen B. Shell membrane C. Shell D. Germinal disc Show Content Detailed Solution General: Germinal disk (blastoderm) -- a small, circular, white spot (2-3 mm across) on the surface of the yolk; it is where the sperm enters the egg. The nucleus of the egg is in the blastodisc. The embryo develops from this disk, and gradually sends blood vessels into the yolk to use it for nutrition as the embryo develops A small mass of active protoplasm found directly under the vitelline membrane There is an explanation video available below.	D

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