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

Paper Info

Year :

2018

Title :

Biology

Exam :

JAMB Exam

Paper 1 | Objectives

41 - 50 of 90 Questions

#	Question	Ans
41.	The yellowish colored liquid component of blood that normally holds the blood cells in suspension is A. serum B. plasma C. water D. thrombocyte Show Content Detailed Solution Blood plasma is a yellowish colored liquid component of blood that normally holds the blood cells in whole blood in suspension; this makes plasma the extracellular matrix of blood cells. It makes up about 55% of the body's total blood volume. blood plasma is a light yellow liquid, similar to the color of straw. Along with water, plasma carries salts and enzymes. The primary purpose of plasma is to transport nutrients, hormones, and proteins to the parts of the body that need it There is an explanation video available below.	B
42.	The function of pith in plant is A. Absorb mineral salt and nutrient from the soil B. Pith is composed of soft, spongy parenchyma cells, which store and transport nutrients throughout the plant. C. trap chlorophyll from the sunlight D. Removal of waste product from the plant Show Content Detailed Solution Pith is composed of soft, spongy parenchyma cells, which store and transport nutrients throughout the plant. There is an explanation video available below.	B
43.	A pollutant that is mostly associated with acid rain is A. Nitrogen oxides B. Ozone C. Flourine D. Carbony (IV) oxide Show Content Detailed Solution The main chemicals in air pollution that create acid rain are sulfur dioxide (SO2) and nitrogen (NOx). Acid rain usually forms high in the clouds where sulfur dioxide and nitrogen oxides react with water, oxygen, and oxidants. This mixture forms a mild solution of sulfuric acid and nitric acid. Nitrogen dioxide and nitric oxide are referred to together as oxides of nitrogen (NOx). NOx gases react to form smog and acid rain There is an explanation video available below.	A
44.	What is the function of contractile vacuole in paramecium? A. Produces Enzymes B. Gets rid of excreta C. Stores and digest food D. Gets rid of excess water Show Content Detailed Solution Osmoregulation. Paramecium and amoeba live in fresh water. Their cytoplasm contains a greater concentration of solutes than their surroundings and so they absorb water by osmosis. The excess water is collected into a contractile vacuole which swells and finally expels water through an opening in the cell membrane. : Excretion of water in Paramecium is carried out by the Contractile vacuoles There is an explanation video available below.	D
45.	An organism which exhibit extracellular digestion is A. Spirogyra B. Paramecium C. Amoeba D. Rhizopus Show Content Detailed Solution Extracellular digestion is a process in which saprobionts feed by secreting enzymes through the cell membrane onto the food. The enzymes catalyze the digestion of the food into molecules small enough to be taken up by passive diffusion, transport, or phagocytosis. Rhizopus use extracellular digestion. There is an explanation video available below.	D
46.	How many days is used for incubation of an egg to release chick A. 21 B. 22 C. 20 D. 23 Show Content Detailed Solution On the 21st day of incubation the chick finishes its escape from the shell. The initial break in the shell is made by the egg tooth. This is referred to as external pipping There is an explanation video available below.	A
47.	The four classes of cnidarian include the following except A. Turbellaria B. Anthozoa C. Scyphozoa D. cubozoa Show Content Detailed Solution Modern cnidarians are generally classified into four main classes: sessile Anthozoa (sea anemones, corals, sea pens); swimming Scyphozoa (jellyfish) and Cubozoa (box jellies); and Hydrozoa Turbellaria are one of the traditional sub-divisions of the phylum Platyhelminthes (flatworms) There is an explanation video available below.	A
48.	What would happen if solution Y is more concentrated than solution X in fig 2 A. The level of X would rise, Y would falls B. The level of X would rise, Y would rise C. The level of X and Y stands the same D. The level of Y would rise, X would fall. Show Content Detailed Solution Osmosis is the spontaneous net movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration, in the direction that tends to equalize the solute concentrations on the two sides Therefore, the level of Y (region of higher concentration) would rise, X (region of lower concentration) would fall to equalize the solute concentrations on the two sides This explain osmosis There is an explanation video available below.	D
49.	Physiological adaptation to very dry conditions in animal demonstrates A. Xeromorphism B. Hibernation C. Aestivation D. Rejuvenation Show Content Detailed Solution Aestivation or æstivation is a state of animal dormancy, similar to hibernation, although taking place in the summer rather than the winter. Aestivation is characterized by inactivity and a lowered metabolic rate, that is entered in response to high temperatures and arid conditions. There is an explanation video available below.	C
50.	The hormones secreted by pancreas serves to A. Facilitate the development of facial hairs B. Raise the level of calcium in the blood C. Lower blood glucose level D. Make the body react to emergencies Show Content Detailed Solution Insulin and glucagon are hormones secreted by islet cells within the pancreas. They are both secreted in response to blood sugar levels Insulin Helps Control Blood Glucose Levels There is an explanation video available below.	C

41.	The yellowish colored liquid component of blood that normally holds the blood cells in suspension is A. serum B. plasma C. water D. thrombocyte Show Content Detailed Solution Blood plasma is a yellowish colored liquid component of blood that normally holds the blood cells in whole blood in suspension; this makes plasma the extracellular matrix of blood cells. It makes up about 55% of the body's total blood volume. blood plasma is a light yellow liquid, similar to the color of straw. Along with water, plasma carries salts and enzymes. The primary purpose of plasma is to transport nutrients, hormones, and proteins to the parts of the body that need it There is an explanation video available below.	B
42.	The function of pith in plant is A. Absorb mineral salt and nutrient from the soil B. Pith is composed of soft, spongy parenchyma cells, which store and transport nutrients throughout the plant. C. trap chlorophyll from the sunlight D. Removal of waste product from the plant Show Content Detailed Solution Pith is composed of soft, spongy parenchyma cells, which store and transport nutrients throughout the plant. There is an explanation video available below.	B
43.	A pollutant that is mostly associated with acid rain is A. Nitrogen oxides B. Ozone C. Flourine D. Carbony (IV) oxide Show Content Detailed Solution The main chemicals in air pollution that create acid rain are sulfur dioxide (SO2) and nitrogen (NOx). Acid rain usually forms high in the clouds where sulfur dioxide and nitrogen oxides react with water, oxygen, and oxidants. This mixture forms a mild solution of sulfuric acid and nitric acid. Nitrogen dioxide and nitric oxide are referred to together as oxides of nitrogen (NOx). NOx gases react to form smog and acid rain There is an explanation video available below.	A
44.	What is the function of contractile vacuole in paramecium? A. Produces Enzymes B. Gets rid of excreta C. Stores and digest food D. Gets rid of excess water Show Content Detailed Solution Osmoregulation. Paramecium and amoeba live in fresh water. Their cytoplasm contains a greater concentration of solutes than their surroundings and so they absorb water by osmosis. The excess water is collected into a contractile vacuole which swells and finally expels water through an opening in the cell membrane. : Excretion of water in Paramecium is carried out by the Contractile vacuoles There is an explanation video available below.	D
45.	An organism which exhibit extracellular digestion is A. Spirogyra B. Paramecium C. Amoeba D. Rhizopus Show Content Detailed Solution Extracellular digestion is a process in which saprobionts feed by secreting enzymes through the cell membrane onto the food. The enzymes catalyze the digestion of the food into molecules small enough to be taken up by passive diffusion, transport, or phagocytosis. Rhizopus use extracellular digestion. There is an explanation video available below.	D

46.	How many days is used for incubation of an egg to release chick A. 21 B. 22 C. 20 D. 23 Show Content Detailed Solution On the 21st day of incubation the chick finishes its escape from the shell. The initial break in the shell is made by the egg tooth. This is referred to as external pipping There is an explanation video available below.	A
47.	The four classes of cnidarian include the following except A. Turbellaria B. Anthozoa C. Scyphozoa D. cubozoa Show Content Detailed Solution Modern cnidarians are generally classified into four main classes: sessile Anthozoa (sea anemones, corals, sea pens); swimming Scyphozoa (jellyfish) and Cubozoa (box jellies); and Hydrozoa Turbellaria are one of the traditional sub-divisions of the phylum Platyhelminthes (flatworms) There is an explanation video available below.	A
48.	What would happen if solution Y is more concentrated than solution X in fig 2 A. The level of X would rise, Y would falls B. The level of X would rise, Y would rise C. The level of X and Y stands the same D. The level of Y would rise, X would fall. Show Content Detailed Solution Osmosis is the spontaneous net movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration, in the direction that tends to equalize the solute concentrations on the two sides Therefore, the level of Y (region of higher concentration) would rise, X (region of lower concentration) would fall to equalize the solute concentrations on the two sides This explain osmosis There is an explanation video available below.	D
49.	Physiological adaptation to very dry conditions in animal demonstrates A. Xeromorphism B. Hibernation C. Aestivation D. Rejuvenation Show Content Detailed Solution Aestivation or æstivation is a state of animal dormancy, similar to hibernation, although taking place in the summer rather than the winter. Aestivation is characterized by inactivity and a lowered metabolic rate, that is entered in response to high temperatures and arid conditions. There is an explanation video available below.	C
50.	The hormones secreted by pancreas serves to A. Facilitate the development of facial hairs B. Raise the level of calcium in the blood C. Lower blood glucose level D. Make the body react to emergencies Show Content Detailed Solution Insulin and glucagon are hormones secreted by islet cells within the pancreas. They are both secreted in response to blood sugar levels Insulin Helps Control Blood Glucose Levels There is an explanation video available below.	C

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