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

Paper Info

Year :

2018

Title :

Biology

Exam :

JAMB Exam

Paper 1 | Objectives

51 - 60 of 90 Questions

#	Question	Ans
51.	Blood circulation in a mammal is said to be double because A. It passes twice through the heart in a complete circuit B. It moves in both arteries and veins C. It circulates in both the hands and other organs D. The heart contains auricles and ventricles Show Content Detailed Solution Double circulation is the type of circulatory system that occurs in mammals, in which the blood passes through the heart twice before completing a full circuit of the body. Blood is pumped from the heart to the lungs and returns to the heart before being distributed to the other organs and tissues of the body. The heart is divided into two separate compartments to prevent oxygenated blood returning from the lungs from mixing with deoxygenated blood from the other parts of the body. its passes through the hear twice There is an explanation video available below.	A
52.	Examples of animals with mammary glands include the following except A. Cow B. Goat C. Pig D. Hen Show Content Detailed Solution An hen does not have mammary gland There is an explanation video available below.	D
53.	The hygrometer is used for measuring A. Relative Humidity B. Specific Gravity C. Rainfall D. Salinity Show Content Detailed Solution A hygrometer is weather instrument used to measure the amount of humidity in the atmosphere. There are two main types of hygrometers -- a dry and wet bulb psychrometer and a mechanical hygrometer. Humidity is the measure of the amount of moisture in the air. A psychrometer is an example of a hygrometer. There is an explanation video available below.	A
54.	Mineral salts can be absorbed into roots by A. Osmosis only B. Osmosis and diffusion C. Diffusion and active transport D. Imbition only Show Content Detailed Solution Root hair cells are adapted to absorb the water out of soil by osmosis – they have a large surface area, thin walls and are close to the xylem cells used for transporting water up the plant. Minerals such as nitrate ions cannot be absorbed by osmosis (which is the movement of water only) or diffusion (because the minerals are in very low concentration). The root hair cells have carrier molecules on their surface that pick up the minerals and move them into the cell against the concentration gradient. This requires energy, and is called active transport There is an explanation video available below.	C
55.	Which is an Animal without red blood cells A. Frog B. Earthworm C. Snake D. Peacock Show Content Detailed Solution Earthworm doesn't have red blood because they do gaseous exchange with the help of skin and the color of blood is red due to the presence of hemoglobin in the red blood cell which helps in carrying oxygen There is an explanation video available below.	B
56.	The temporary union of two organisms and the exchange of micronuclear elements is called A. Conjugation B. Binary fusion C. Extrapolation D. Interexchange Show Content Detailed Solution Conjugation consists of the temporary union of two organisms and the exchange of micronuclear elements There is an explanation video available below.	A
57.	A plant tissue that carries water and mineral salt is A. Xylem B. Cortex C. Phloem D. Cambium Show Content Detailed Solution Xylem transports water and mineral salts from the roots up to other parts of the plant, while phloem transports sucrose and amino acids between the leaves and other parts of the plant. The xylem, vessels and tracheid’s of the roots, stems and leaves are interconnected to form a continuous system of water conducting channels reaching all parts of the plants. There is an explanation video available below.	A
58.	Which of the following relationship involves only one organism A. Saprophytism B. Commensalism C. Parasitism D. Symbiosis Show Content Detailed Solution A saprophyte or saprotroph is an organism which gets its energy from dead and decaying organic matter. This may be decaying pieces of plants or animals. This means that saprophytes are heterotrophs. They are consumers in the food chain. There is an explanation video available below.	A
59.	Which parts provides food for the developing chick? A. 2 and 3 B. 4 and 5 C. 3 and 4 D. 2 and 5 Show Content Detailed Solution Yolk (3) & Albumen (4) provide food for developing chick Albumen is a solution of protein in water that is secreted by the oviduct of birds and some reptiles. Albumen surrounds the embryo and yolk, which it cushions within the shell of the egg. It is eventually absorbed by the embryo as food. There is an explanation video available below.	C
60.	The outer membrane that covers the brain is A. Myelin sheath B. Dura mater C. Arachnoid membrane D. Pia mater Show Content Detailed Solution Dura mater is a membrane that envelops the arachnoid mater. It surrounds and supports the dural sinuses (also called dural venous sinuses, cerebral sinuses, or cranial sinuses) and carries blood from the brain toward the heart There is an explanation video available below.	B

51.	Blood circulation in a mammal is said to be double because A. It passes twice through the heart in a complete circuit B. It moves in both arteries and veins C. It circulates in both the hands and other organs D. The heart contains auricles and ventricles Show Content Detailed Solution Double circulation is the type of circulatory system that occurs in mammals, in which the blood passes through the heart twice before completing a full circuit of the body. Blood is pumped from the heart to the lungs and returns to the heart before being distributed to the other organs and tissues of the body. The heart is divided into two separate compartments to prevent oxygenated blood returning from the lungs from mixing with deoxygenated blood from the other parts of the body. its passes through the hear twice There is an explanation video available below.	A
52.	Examples of animals with mammary glands include the following except A. Cow B. Goat C. Pig D. Hen Show Content Detailed Solution An hen does not have mammary gland There is an explanation video available below.	D
53.	The hygrometer is used for measuring A. Relative Humidity B. Specific Gravity C. Rainfall D. Salinity Show Content Detailed Solution A hygrometer is weather instrument used to measure the amount of humidity in the atmosphere. There are two main types of hygrometers -- a dry and wet bulb psychrometer and a mechanical hygrometer. Humidity is the measure of the amount of moisture in the air. A psychrometer is an example of a hygrometer. There is an explanation video available below.	A
54.	Mineral salts can be absorbed into roots by A. Osmosis only B. Osmosis and diffusion C. Diffusion and active transport D. Imbition only Show Content Detailed Solution Root hair cells are adapted to absorb the water out of soil by osmosis – they have a large surface area, thin walls and are close to the xylem cells used for transporting water up the plant. Minerals such as nitrate ions cannot be absorbed by osmosis (which is the movement of water only) or diffusion (because the minerals are in very low concentration). The root hair cells have carrier molecules on their surface that pick up the minerals and move them into the cell against the concentration gradient. This requires energy, and is called active transport There is an explanation video available below.	C
55.	Which is an Animal without red blood cells A. Frog B. Earthworm C. Snake D. Peacock Show Content Detailed Solution Earthworm doesn't have red blood because they do gaseous exchange with the help of skin and the color of blood is red due to the presence of hemoglobin in the red blood cell which helps in carrying oxygen There is an explanation video available below.	B

56.	The temporary union of two organisms and the exchange of micronuclear elements is called A. Conjugation B. Binary fusion C. Extrapolation D. Interexchange Show Content Detailed Solution Conjugation consists of the temporary union of two organisms and the exchange of micronuclear elements There is an explanation video available below.	A
57.	A plant tissue that carries water and mineral salt is A. Xylem B. Cortex C. Phloem D. Cambium Show Content Detailed Solution Xylem transports water and mineral salts from the roots up to other parts of the plant, while phloem transports sucrose and amino acids between the leaves and other parts of the plant. The xylem, vessels and tracheid’s of the roots, stems and leaves are interconnected to form a continuous system of water conducting channels reaching all parts of the plants. There is an explanation video available below.	A
58.	Which of the following relationship involves only one organism A. Saprophytism B. Commensalism C. Parasitism D. Symbiosis Show Content Detailed Solution A saprophyte or saprotroph is an organism which gets its energy from dead and decaying organic matter. This may be decaying pieces of plants or animals. This means that saprophytes are heterotrophs. They are consumers in the food chain. There is an explanation video available below.	A
59.	Which parts provides food for the developing chick? A. 2 and 3 B. 4 and 5 C. 3 and 4 D. 2 and 5 Show Content Detailed Solution Yolk (3) & Albumen (4) provide food for developing chick Albumen is a solution of protein in water that is secreted by the oviduct of birds and some reptiles. Albumen surrounds the embryo and yolk, which it cushions within the shell of the egg. It is eventually absorbed by the embryo as food. There is an explanation video available below.	C
60.	The outer membrane that covers the brain is A. Myelin sheath B. Dura mater C. Arachnoid membrane D. Pia mater Show Content Detailed Solution Dura mater is a membrane that envelops the arachnoid mater. It surrounds and supports the dural sinuses (also called dural venous sinuses, cerebral sinuses, or cranial sinuses) and carries blood from the brain toward the heart There is an explanation video available below.	B

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