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CBSE Questions for Class 7 Biology Transportation In Animals And Plants Quiz 2 - MCQExams.com
CBSE
Class 7 Biology
Transportation In Animals And Plants
Quiz 2
Arteries can be distinguished from veins because the arteries have:
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Thicker walls
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More blood cells
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More plasma
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Thinner walls
Explanation
Arteries have more muscular walls than veins because the arteries have to carry the oxygenated blood from the heart to the other parts of the body at high pressure and velocity than the veins.
The vein carries deoxygenated blood from the different parts of the body to the heart.
An artery has to pump blood throughout the body, hence having a thick muscular wall.
So, option 'A' is correct.
.............. receives oxygenated blood from the lungs.
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Right auricle
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Right ventricle
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Left auricle
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Left ventricle
Explanation
$$\textbf{Solution:}$$ Left auricle.
$$\textbf{Explanation:}$$
$$\bullet$$ The heart consists of four chambers in which blood flows, namely are right atrium, right ventricle, left atrium and left ventricle.
$$\bullet$$ Left auricle receives oxygenated blood from the lungs.
$$\textbf{Additional Information:}$$
$$\bullet$$Deoxygenated blood enters the right atrium and passes through the right ventricle. The right ventricle pumps the blood to the lungs where it becomes oxygenated.
$$\bullet$$ The oxygenated blood is brought back to the heart by the pulmonary veins which enter the left atrium. From the left atrium blood flows into the left ventricle.
$$\bullet$$ The left ventricle pumps the blood to the aorta which will distribute the oxygenated blood to all parts of the body.
$$CO_2$$ is removed from the blood in the:
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Liver
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Heart
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Kidney
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Lungs
Explanation
Blood containing carbon dioxide flows from veins throughout the body to the heart, and then the heart pumps it to the lungs. Small air sacs (alveoli) in the lungs remove the carbon dioxide from the blood and release it into the lungs where it is exhaled.
So, the correct answer is option D.
Which of the following is used as artificial kidney in the patients suffering from kidney failure?
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Filteration
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Circulation
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Dialysis
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Ventilation
Explanation
The process of filtering the blood by the artificial kidney is known as dialysis.
It is a method of removing excess water, nitrogenous wastes (urea), toxins from the blood in the patient who is rapidly developing loss of kidney function.
It is also called renal replacement therapy. Hence dialysis is used as an artificial kidney in kidney failure patients.
So, the correct answer is 'Dialysis'.
Urine is stored in the
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Kidney
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Urinary bladder
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Ureter
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Urethra
Explanation
Urine is formed in the kidneys through the filtration of blood and from the kidney,
the ureter transports urine into the urinary bladder.
The urinary bladder is a muscular sac. When it is empty, it is about the size and shape of a pear.
It acts as a temporary reservoir for urine.
So, the correct answer is 'Urinary bladder'.
Blood from the left ventricle is pumped to
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Lungs
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Left auricle
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Right ventricle
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All parts of the body
Explanation
$$\textbf{Correct option : D}$$
$$\textbf{Solution :}$$
$$\bullet$$ The heart has four chambers such as right atrium, right ventricle, left atrium and left ventricle.
$$\bullet$$ These chambers help to separate the oxygenated and deoxygenated blood from mixing.
$$\bullet$$ The right part of the heart i.e. right atrium and right ventricle contains deoxygenated blood and left part of the heart i.e. left atrium and left ventricle contains oxygenated blood.
$$\bullet$$ The left ventricle pumps the oxygenated blood out of the heart into the aorta.
$$\bullet$$ $$\textbf{Various branches of the aorta supply blood to all the body parts.}$$
$$\bullet$$ So, the correct option is $$\textbf{D}$$.
The resting person usually has a pulse rate between _________ beats per minute.
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72-78
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72-80
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72-76
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70-80
Explanation
Pulse rate is basically the number of times your heart beats per minute. If a person is at rest which means either the person is sitting or lying and is in a relaxed and healthy state then normally, the pulse rate of that person will be 72 to 80 beats per minute.
Therefore, the correct answer is option B.
A normal pulse is .......... in rhythm.
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Regular
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Irregular
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Both A and B
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None of the above
Explanation
A normal pulse is regular and strong. Heart rates, and therefore pulse rates (number of beats per minute) change with age and can vary between individuals of the same age.
So, the correct option is 'Regular'.
Urea formed in the body is removed by which of the following metabolic system?
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Circulatory system
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Excretory system
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Respiratory system
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All
Explanation
The excretory system is a passive biological system that removes excess, unnecessary materials from the body fluids of an organism, so as to help maintain internal chemical balance and prevent damage to the body. Urea is produced when foods containing protein, such as meat, poultry, and certain vegetables, are broken down in the body. Urea is carried in the bloodstream to the kidneys where it gets filtered, and thus it is removed from the blood via urinary system. Therefore the correct answer is option B.
Food from the leaves is conducted ______ through the phloem in the stem.
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Upwards
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Downwards
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Both A and B
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None of these
Explanation
Food from the leaves is conducted downwards through the phloem in the stem. The food is then stored in organs like root, stem fruits etc. When the food synthesized is in less amount or not synthesized at all due to environmental or physiological conditions then it is supplied upwards from the storage organs to the leaves. Conduction of water through the xylem occurs always in the upward direction.
So, the correct answer is '
Downwards'
The anti-coagulant present in human blood is
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Calcium
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Heparin
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Porphyrin
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Iron
Phloem is responsible for transporting _____ in plants.
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Sugars
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Proteins
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Water
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Both A and B
Explanation
Xylem transports and stores water and water-soluble nutrients in vascular plants. Phloem is responsible for transporting sugars, proteins, and other organic molecules in plants.
So, the correct answer is option D.
Which one is correct?
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Blood has WBC and lymph has RBC
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Blood has WBC, RBC and lymph has nothing
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Blood has RBC, WBC and lymph has WBC
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Lymph has WBC, RBC and blood has RBC
Pulmonary vein carries oxygenated blood from:
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Heart to its walls
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Heart to lungs
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Lungs to heart
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Heart to all body parts
Explanation
The
pulmonary veins
are the veins that transfer
oxygenated blood
from the lungs to the heart.
This differentiates the pulmonary veins from other veins in the body, which carry deoxygenated blood from the rest of the body back to the heart.
So, the correct answer is option C.
The number of beats _______ is called the pulse rate.
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Per two minutes
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Per three minutes
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Per minute
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Per four minutes
Explanation
Pulse is a term that signifies the throbbing of arteries as an effect of heartbeat and is counted by the number of beats per minute, which is called the pulse rate. The normal pulse rate (count of arterial pulse beats per minute) in a healthy adult at rest ranges from 72
to
80 beats per minute. However, the pulse rate may fluctuate with exercise, illness, injury and emotions. The p
ulse rate of an individual can be checked at various points on the body. These points are the neck, inside of the elbow, the wrist, groin, behind the knee, ankle joint and foot.
So, the correct answer is option C.
The rhythmic contraction and relaxation of heart muscles makes a
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Heart cycle
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Heart rate
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Heart beat
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None of the above
Explanation
Heartbeat is rhythmic contraction and relaxation of heart muscles is called a heartbeat. Heart rate is the speed of the heartbeat measured by a number of contraction of the heart per minute.
Thus the correct answer is C.
The movement in the vessels on the wrist is due to the
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Beat
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Pulse
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Pulse rate
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Heartbeat
Explanation
The heart rate is the same as pulse rate because the pumping action of the heart causes an increase in blood pressure in arteries. Hence the movement in the vessels on the wrist is due to the pulse.
So, the correct answer is 'Pulse'.
Aniruddha wants to make a stethoscope. He is confused what he should use for its tube portion. Help him.
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Wollen tube
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Iron tube
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Rubber tube
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Plastic tube
Which of the following can be used to make a stethoscope at home?
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Rubber tube
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Balloon
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Funnel
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All of the above
Explanation
Steps to construct a stethoscope at home:
1) Take a funnel and put its small end at one end of the flexible tube. Push the funnel as far as u can into the tube.
2) Tape the funnel using suitable tape.
3) Inflate the balloon to stretch it out. Let the air out and then cut the neck of the ballon.
3) Stretch the remaining part of the balloon tightly over the open end of the funnel, and tape it. This creates the tympanic membrane for the stethoscope
4) Place the funnel end of the stethoscope on to the chest and end of the tube to the ear to listen to the heartbeat.
Hence rubber tube, balloon and funnel can be used to make a stethoscope at home.
So, the correct answer is 'All of the above'.
Raman went to the doctor. On which side of the chest will the doctor keep the stethoscope for hearing his heartbeat?
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Right side
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Middle
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Left side
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None of the above
Explanation
In humans, the heart is present in the chest region.
It is located between the lungs and above the diaphragm.
The heart is slightly tilted towards the left side and thus, a stronger heartbeat can be felt on the left side.
Hence the doctor will keep the stethoscope for hearing Raman's heartbeat on the left side of his chest.
Thus the correct answer is option C.
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