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CBSE Questions for Class 7 Biology Transportation In Animals And Plants Quiz 1 - MCQExams.com
CBSE
Class 7 Biology
Transportation In Animals And Plants
Quiz 1
Most of the volume of normal human blood is composed of?
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0%
Blood
0%
Plasma
0%
Water
0%
Minerals
Explanation
55 % of blood is composed of Plasma. Plasma is a clear fluid which have various cells suspended in it.
Rest are the blood cells which includes RBCs, WBCs, and Blood platelets, apart from this there are some proteins also in the blood e.g. Albumin, etc.
Therefore, Option B is correct.
The platelets present in the blood help in:
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0%
Transportation of gases
0%
Clotting of blood
0%
Fighting against diseases
0%
Transporting of glucose
Explanation
$$\textbf{Correct option:B}$$
$$\textbf{Solution:}$$
Platelets, also known as thrombocytes, are blood cells that aid in the clotting of blood.
Platelets rush to the site of injury when a blood vessel wall is injured and form a plug or clot to stop the bleeding.
If your platelet count is low (a condition known as thrombocytopenia), you're more likely to have uncontrolled or prolonged bleeding.
When the blood contains too many platelets (a condition known as thrombocytosis), inappropriate blood clot formation can occur, which can be dangerous and life-threatening.
Hence, the correct answer is option B
The respiratory pigment present in humans is _______.
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0%
RBCs
0%
WBCs
0%
Haemoglobin
0%
Platelets
Explanation
RBCs, WBCs and platelets are components of blood.
Haemoglobin is the respiratory pigment present in RBC, which binds with oxygen and transports it to other parts of the body.
Thus, Option "C" is correct.
The device used by the doctor to hear the heartbeat is:
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0%
Periscope
0%
Thermometer
0%
Stethoscope
0%
Microscope
Explanation
Doctors check the heartbeat with the help of a device called a stethoscope. The stethoscope has a chest piece, two earpieces and a tube for joining the parts. A stethoscope amplifies the sound of the heart.
So, the correct answer is 'Stethoscope'.
The device used to hear the heartbeat is called _________.
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0%
Thermometer
0%
Stethoscope
0%
Sphygmomanometer
0%
Microscope
Explanation
Thermometer is used for measuring temperature.
Stethoscope is used to measure heartbeat.
Sphygmomanometer is used to measure blood pressure.
Microscope is used to observe organisms, tissues or cells that cannot be seen through naked eyes.
So, the correct answer is '
Stethoscope'.
The muscular tube which has the urinary opening at its end is known as
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0%
Urinary bladder
0%
Ureter
0%
Urethera
0%
Penis
Explanation
The muscular tube known as Urethra is a long tube which connects the urinary bladder to the urinary meatus for removal of urine from the body.
So, the correct answer is 'Urethra'.
What is the function of heart?
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0%
To pump blood.
0%
To maintain emotions.
0%
To maintain blood pressure.
0%
Both A and C
Explanation
Hearts main function is to pump blood and supply oxygen (blood pressure) to all parts of the body. And not to maintain emotions which is controlled by hormones. Therefore, Option D is correct.
Deoxygenated blood is carried by?
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0%
Veins
0%
Arteries
0%
Both A and B
0%
Capillaries
Exercise makes the heart beat faster.
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0%
True
0%
False
Explanation
Muscles need more oxygen when you exert yourself
During
exercise
, the heart typically beats
faster
so that more blood gets out to your body.
Therefore, it is true that exercise can make the heartbeat faster.
The heart is also called_____.
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0%
Pumping device
0%
Muscular pump
0%
Muscular machine
0%
Pumping muscle
Explanation
The heart is a muscular organ of the size of your fist that pumps blood through the body. It is made up of multiple layers of tissue.
So, option B is correct.
How many chambers are present in human heart?
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0%
4
0%
2
0%
8
0%
6
Explanation
Human heart is made up of 4 chambers due to which flow of oxygen rich takes place separately from oxygen deficient blood. Therefore, Option A is correct.
Who discovered circulation of blood?
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0%
William Harvey
0%
Issac Newton
0%
Robert Boyle
0%
Edward Jenner
Explanation
William Harvey discovered the circulation of blood. Option A is correct.
Blood carries carbon dioxide to _______.
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0%
Lungs
0%
Liver
0%
Heart
0%
Intestine
Explanation
Deoxygenated blood carries carbon dioxide to lungs for exchange of gases in the body.
Option A is correct.
The artery that carries deoxygenated blood is?
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0%
Pulmonary artery
0%
Pulmonary vein
0%
Artery
0%
Vein
Explanation
Pulmonary veins carry oxygenated blood towards the heart and the pulmonary arteries carry deoxygenated blood away from the heart.
Artery carries oxygenated blood from heart to the body and the veins carry deoxygentated blood from the body to heart.
Therefore, Option A is correct.
Plants have_____ to transport water to the entire plant.
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0%
Xylem
0%
Phloem
0%
Leaf
0%
Both A and B
Explanation
The vascular tissue for the transport of water and nutrients in the plant is called the
xylem
.
The food has to be transported to all parts of the plant. This is done by the vascular tissue called the phloem
.
The leaf is not responsible for transportation within a plant.
Therefore, the correct option is A.
The upper two chambers of a heart are known as________.
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0%
Ventricles
0%
Atrium
0%
Upper chamber
0%
Lower chamber
Explanation
Human heart have 4 chambers. The upper 2 chambers are called Atrium. And the lower 2 chambers are called Ventricles. Therefore, Option B is correct.
How many kidneys does human have?
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0%
2
0%
1
0%
4
0%
3
Explanation
Humans have two kidneys in them. Option A is correct.
What is the main function of the excretory system?
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0%
To collect and remove wastes from the body.
0%
To strengthen skeletal muscles.
0%
To protect the nervous system.
0%
To bring oxygen to body cells.
Explanation
The main function of the excretory system is to collect and remove wastes from the body.
Kidneys are the main excretory organs.
These remove the nitrogenous wastes produced due to various metabolic activities in the body.
Some other organs carrying out excretion are the liver, skin, and lungs.
So, option A is correct.
The following graph depicts the rate and extent of a person's breathing just before exercise.
Here V is the volume of air in lungs in $$dm^3$$ and t is the time in seconds. Which of the following graph best depicts the rate and extent of breathing of the same person immediately after a period of exercise?
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0%
0%
0%
0%
The distinguishing feature of an artery from a vein is:
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0%
Thicker wall
0%
Usually carries oxygenated blood
0%
Carries more haemoglobin
0%
Both A and B
Explanation
An artery usually carries oxygenated blood from the heart to different parts of the body. It has thick walls that allow it to withstand the high pressure of the blood.
Veins usually carry deoxygenated blood from the different parts of the body to the heart. The veins have thin walls.
So, the correct answer is option D.
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