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14 questions · timed · auto-graded

Question 21 Mark
Define the following:
Nephron
Answer
Inside the kidney, there are millions of microscopic tubes called renal tubules or nephrons. It is the structural and functional unit of the kidney.
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Question 31 Mark
Define the following:
Dialysis
Answer
The artificial process which cleans and filters the blood in a person where one or both the kidney may stop working properly is called dialysis.
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Question 41 Mark
What are the symptoms of a urinary tract infection?
Answer
Common symptoms include a strong and frequent urge to urinate, and a painful and burning sensation while urinating.
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Question 51 Mark
What is meant by osmoregulation?
Answer
The process of maintaining the accurate concentration of water and salts in the body is called osmoregulation.
This is done by the kidneys.
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Question 61 Mark
Answer the following in short.
Define transpiration in plants.
Answer
The process of losing excess water in the form of water vapour from a living plant is known as transpiration.
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Question 71 Mark
Answer the following in short.
List five waste products of plants.
Answer
Tannins, resins, latex, gums, essential oils, caffeine, quinine, morphine, etc.
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Question 81 Mark
Answer the following in short.
What is urethra?
Answer
Urethra is a canal-like opening at the bottom of the urinary bladder through which urine is passed out from the body.
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Question 91 Mark
Find the odd one out. Give a reason for your choice.
tannin, urine, latex, resin
Answer
urine, because it is excretory product of animals and rests are excretory products of plants.
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Question 101 Mark
Answer the following in short.
What are the main organs involved in the human excretory system?
Answer
The main organs involved in the human excretory system are a pair of bean-shaped kidneys, ureters from each kidney, urinary bladder, urethra.
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Question 111 Mark
Find the odd one out. Give a reason for your choice.
skin, heart, lung, liver, kidney
Answer
Heart because it helps to pump blood in our body and the help of the rest in excretion.
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Question 121 Mark
Differentiate between
bowman’s capsule and glomerulus.
Answer
Bowman’s capsule Glomerulus
1 Each nephron of the kidney consists of a cup-shaped structure at one end called the Bowman’s capsule. 1 The glomerulus is a network of blood capillaries present inside the Bowman’s capsule.
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Question 131 Mark
Answer the following in short.
What is excretion?
Answer
The process of removing waste, formed as a result of chemical reactions in the body is called excretion.
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Question 141 Mark
Find the odd one out. Give a reason for your choice.
ureter, kidney, urinary bladder, lung, urethra
Answer
lung, because all others are organs of excretory system and it is a respiratory organ.
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[1 Mark Question Answer] - BIOLOGY STD 7 Questions - Vidyadip