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CBSE Questions for Class 7 Biology Transportation In Animals And Plants Quiz 3 - MCQExams.com
CBSE
Class 7 Biology
Transportation In Animals And Plants
Quiz 3
The separation of the atria and ventricles helps to:
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Prevent mixing of the blood.
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Pump blood only to lower parts of the body.
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Pump blood only to upper parts of the body.
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Both A and C.
Rubber tube, ear piece and diaphragm are parts of a
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Headphone
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Microphone
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Periscope
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Stethoscope
Explanation
The stethoscope is an acoustic (hearing) medical device used for auscultation(listening of internal sounds of the body. The doctor will place a small metal circle called a bell (hallow disc) or
diaphragm
(plastic disc), against the chest, at the spot where a person can feel the heartbeat. The stethoscope is composed of rubber tube, earpiece and diaphragm.
So, the correct answer is 'Stethoscope'.
Which of the following cells get activated during bleeding?
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RBC
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WBC
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Platelets
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Macrophage
Explanation
When an injury causes a blood vessel wall to rupture, platelets then rush to the site of damage and get activated.
They form a plug (clot) to fix the damage. The process of spreading across the surface of a damaged blood vessel to stop bleeding is called adhesion. This is because when platelets get to the site of the injury, they grow sticky tentacles that help them stick (adhere) to one another.
So, the correct answer is 'Platelets'.
The blood with no oxygen is received in the
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Left atrium
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Left ventricle
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Right atrium
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Right ventricle
Explanation
The heart is the pumping organ of the body. It consists of four chambers i.e., the right auricle, left auricle, right ventricle and left ventricle. The right auricle receives the deoxygenated blood from the body and pumps it to right ventricle which in turn pumps it to the pulmonary artery. Whereas left auricle receives blood from lungs and pumps it to left ventricle from where it is pumped to the whole body through the aorta. Thus, the correct answer is option C.
The given figure illustrates a section through the human heart.
Which labelled part represents the site for the generation of action potential in human heart?
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A
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B
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C
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D
Explanation
The SA node is present in the right atrium of heart which contains pacemaker cells. It is responsible for the generation of action potential.
'B' represent the valve present between right atrium and right ventricle.
'C' is the right ventricle.
'D' represent the valve between left atrium and left auricle.
Thus, the correct answer is '
A.'
State whether the following statement is true or false.
Veins generally have thicker walls than arteries.
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True
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False
Explanation
The blood flow in the arteries is rapid and at high pressure, so the arteries have thick elastic walls while due to low pressure of blood in the veins, thicker walls are not necessary, so veins have thin walls.
Hence, the correct option is 'False'.
The correct sequence of urine movement is
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Bladder --> Kidney --> Ureter -->Urethra
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Bladder -->Urethra -->Kidney -->Ureter
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Kidney -->Bladder -->Ureter --> Urethra
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Kidney -->Ureter -->Bladder -->Urethra
Explanation
Urine is formed in the kidney. The tubes which connect the kidney and urinary bladder are known as the ureter. From the kidney, urine is propelled into the urinary bladder through ureters which are made of smooth muscle fibres. The bladder stores urine, allowing urination to be infrequent and can be controlled. The urethra is a long tube which connects the urinary bladder to the urinary opening for removal of urine from the body.
So the correct sequence of urine movement is Kidney -->Ureter -->Bladder--> Urethra.
So, the correct answer is 'Kidney -->Ureter -->Bladder -->Urethra'.
'Haemoglobin' is found in
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Blood
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Bile fluid
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Sweat
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None of these
Name the parts labelled A, B, C and D.
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A: Kidney, B: Urinary bladder, C: Urethra, D: Ureter
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A: Kidney, B: Ureter, C: Urinary bladder, D: Urethra
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A: Kidney, B: Urethra, C: Collecting duct, D: Anus
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A: Kidney, B: Seminiferous tubules, C: Uterus, D: Ureter
Explanation
The kidneys filter out the blood and pass the urine to the urinary bladder through ureters. Urine is excreted out through the urethra.
The correct answer is 'A: Kidney, B: Ureter, C: Urinary bladder, D: Urethra'.
The composition of urine is:
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25% water, 2.5 % urea and 2.5% other waste
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95% water, 2.5 % urea and 2.5% other waste
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95% water, 2.5 % urea and 12.5% other waste
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None of the above
Explanation
An adult human on average excretes 1 to 1.5 litres of urine per day. It is light yellow in colour, slightly acidic with a characteristic odour.
The composition of urine is 95% water, 2.5 % urea and 2.5% other waste.
So, the correct answer is option B.
Arteries are best defined as the vessels which
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Supply oxygenated blood to the different organs
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Carry blood away from the heart to different organs
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Break up into capillaries which reunite to form a vein
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Carry blood from one visceral organ to another visceral organ
Consider the following statements regarding haemoglobin:
1. It contains iron
2. It is a carrier of oxygen in the blood
3. It imparts red colour to the blood
It provides immunity against certain diseases.
Of these statements.
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1, 3 and 4 are correct
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1, 2 and 3 are correct
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1, 2 and 4 are correct
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2, 3 and 4 are correct
The stethoscope was discovered by
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Antonie van Leeuwenhoek
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Leopold Auenbrugger
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Jean-Nicolas Corvisart
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René Laennec
Explanation
Rene Laennec was a french physician. He invented the stethoscope in 1816. It is used to listen heart and lungs sound.
So, the correct answer is 'René Laennec'.
Where is blood filtered in our body?
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Kidneys
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Lungs
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Liver
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Heart
Explanation
The mechanism to filter the blood is done by the blood capillaries (nephrons) in the kidneys.
Thus, Option A is correct.
The two lower chambers of the heart are called
_______
.
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Atrium
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Ventricles
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Pulmonary vein
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Pulmonary artery
Explanation
There is a total of 4 chambers of the human heart.
The two upper chambers of the heart are called Atria.
The
two lower chambers of the heart are called
ventricles
.
Option B is correct.
When you feel your pulse, what you actually feel is blood rushing through the _______.
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Arteries
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Veins
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Capillaries
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All of these
Explanation
When we feel the pulse, it is the pressure exerted by the blood on the wall of arteries because of the systole of the left ventricle.
So, the correct answer is '
Arteries'.
Erythrocyte is another name for______.
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Red Blood Cells
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White Blood Cells
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Platelets
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White Bone cells
Explanation
RBCs or Red Blood Cells are known as Erythrocytes. While, WBCs or White Blood Cells are known as Leukocytes.
Therefore, option A is correct.
Which of the following is likely to increase in number when the body is under attack from bacteria?
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RBCs
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Platelets
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Bone cells
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WBCs
Explanation
The blood is made up of majorly four components: - Red blood cells, White blood cells, blood platelets, and Blood plasma.
The white blood cells (WBC) fight against germs that may enter our bodies.
Therefore, option D is correct.
What are the main functions of blood?
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Transport
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Protection
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Regulation
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All of the above
Explanation
Blood is the fluid that flows in blood vessels.
It transports substances like digested food from the small intestine to the other parts of the body.
It carries oxygen from the lungs to the cells of the body.
Leukocytes, or white blood cells present in the blood, destroy invading microorganisms and cancer cells. Hence. protect us from various infections.
Platelet factors initiate blood clotting and help minimize blood loss in any injury that causes rupturing of blood vessels.
Blood helps to regulate pH and water balance by transferring water to and from tissues.
Option D is correct.
Due to the presence of hemoglobin, ____________.
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Veins appear red
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Arteries appear red
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Veins appear blue
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Arteries appear blue
Explanation
Oxygen binds to hemoglobin in red blood cells which supply oxygenated blood to all parts of the body.
Therefore oxygenated blood is transported through arteries and due to presence of hemoglobin, Arteries appear red.
Option B is correct.
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