Tag: excretion in living organisms

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Questions Related to excretion in living organisms

Multiple choice evs - i excretion in living organisms other systems in the body excretory system in human human excretory organs

The correct sequence of urine movement is

  1. Bladder --> Kidney --> Ureter -->Urethra

  2. Bladder -->Urethra -->Kidney -->Ureter

  3. Kidney -->Bladder -->Ureter --> Urethra

  4. Kidney -->Ureter -->Bladder -->Urethra
Reveal answer Fill a bubble to check yourself
D Correct answer
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 urinary bladder to the urinary meatus for removal of urine from the body. In males, urethra travels through the penis and meet the urethral meatus located at the tip of the penis. In females, urethra connects to the urethral meatus above the vagina. The urethra is also known as the urinary opening. So the correct sequence of urine movement is Kidney -->Ureter -->Bladder--> Urethra.
So, the correct answer is 'Kidney -->Ureter -->Bladder -->Urethra'.
Multiple choice evs excretion in living organisms other systems in the body excretory system in human human excretory organs

Urine is excreted out of the body through

  1. Pelvis

  2. Ureter

  3. Urinary bladder

  4. Urethra
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

a) Pelvis is the lower region of abdomen which houses various organs. 

b) Ureter carries urine from kidneys to urinary bladder hence, it does not excrete urine out of the body. 
c) Urinary bladder only stores the urine. 
d) Urethra carries urine from the urinary bladder to the outside of the body. 
So, the correct answer is 'Urethra'.

Multiple choice evs excretion in living organisms other systems in the body excretory system in human human excretory organs

Which of the following does not help in excretion?

  1. Liver

  2. Sweat glands

  3. Pancreas

  4. Both A and B
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
In liver the toxic ammonia is converted to urea which is filtered by kidney to form urine. Sweat glands help in excretion of excess salts and water in the form of sweat. Hence, both these organs help in excretion. Pancreas on the other hand, secrete the hormones insulin and glucagon and digestive enzymes. Hence, it has endocrine and digestive functions but not excretory functions.
So, the correct answer is 'Pancreas'.
Multiple choice evs excretion in living organisms other systems in the body excretory system in human human excretory organs

Urinary bladder opens to the outside through

  1. Nephron

  2. Glomerulus

  3. Ureter

  4. Urethra
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

a) Nephrons are structures located in the kidney which help in filteration of blood to form urine. 

b) Glomerulus are a part of nephrons and are located in kidneys. 
c) Ureters carry urine from kidneys to urinary bladder. 
d) Urethra carries urine from urinary bladder to the outside.
So, the correct answer is option 'Urethra'.

Multiple choice evs - i excretion in living organisms other systems in the body excretory system in human human excretory organs

Average quantity of urea excreted daily humans per day is

  1. 10 - 15 g

  2. 25 - 30 g

  3. 40 - 50 g

  4. 100 - 500 mg
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The composition of urine in humans is 95% water, 2.5 % urea and 2.5% other waste. As urea is the major excretory waste humans are considered ureotelic., On an average, 25-30 g of urea is excreted out per day.

So, the correct answer is '25-30 g'.

Multiple choice evs excretion in living organisms other systems in the body excretory system in human human excretory organs

The composition of urine is

  1. 25% water, 2.5 % urea and 2.5% other waste

  2. 95% water, 2.5 % urea and 2.5% other waste

  3. 95% water, 2.5 % urea and 12.5% other waste

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
An adult human on an average excretes 1 to 1.5 liters of urine per day. It is light yellow in color, slightly acidic with a characteristic odor. The composition of urine is 95% water, 2.5 % urea and 2.5% other waste. As urea is the major excretory waste humans are considered ureotelic.
So, the correct answer is '95% water, 2.5 % urea and 2.5% other waste'.
Multiple choice evs excretion in living organisms other systems in the body excretory system in human human excretory organs

The conduction of urine from kidney to the urinary bladder takes place by

  1. Ureter

  2. Urethra

  3. Ovary

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Urine is formed in the kidney. From the kidneys, two tubes called ureter one from each kidney descend to the urinary bladder which conducts urine from the kidneys to the urinary bladder. Urinary bladder receives and stores urine. Later, on stimulus urine is excreted to outside through urethra.

So, the correct answer is 'Ureter'.

Multiple choice evs excretion in living organisms other systems in the body excretory system in human human excretory organs

The tubes which connect the kidney and urinary bladder is known as

  1. Ureter

  2. Kidney

  3. Urethra

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The tubes which connect the kidney and urinary bladder are known as the ureter. Urine is formed in the kidney. From the kidney, urine is propelled into the urinary bladder through the tubes called ureters which are made of smooth muscle fibres.
So, the correct answer is 'Ureter'.
Multiple choice evs excretion in living organisms other systems in the body excretory system in human human excretory organs

Choose the correct answers from the following given.
Which of the following is not an excretory organ?

  1. Spleen

  2. Kidney

  3. Liver

  4. Lungs
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Although kidney is the main organs of excretion, several other organs also excrete wastes. They include the liver, skin, and lungs.  Excretory system of a human consists of kidneys, ureters, urinary bladder, and urethra.

So the correct answer is spleen.