Tag: digestion and absorption

Questions Related to digestion and absorption

If liver is removed, which component of blood will increase?

biology digestion and absorption liver functions of the liver secretory organs

  1. Ammonia

  2. Protein

  3. Uric acid

  4. Urea

Show answer
Correct Option: A
Explanation:
  • Animals accumulate ammonia, urea, uric acid, carbon dioxide, water and ions like Na +, K+, Cl–, phosphate, sulphate, etc., either by metabolic activities or by other means like excess ingestion. 
  • These substances have to be removed totally or partially. Ammonia, urea and uric acid are the major forms of nitrogenous wastes excreted by the animals.  Ammonia is rapidly removed from the liver by urea cycle.
  • Urea cycle takes place in the liver in which the ammonia is converted into a water-soluble compound known as urea. Urea formed is a non-toxic excretion product whereas Ammonia is toxic to the CNS because it reacts with the α-ketoglutarate to form glutamate. Hence, If the liver is removed, which component of blood will increase is ammonia.
So, the correct answer is 'ammonia'.

Lymphocytes of lower vertebrates are produced in

biology digestion and absorption liver functions of the liver secretory organs

  1. Liver

  2. Spleen

  3. Bone marrow

  4. Vertebrae.

Show answer
Correct Option: A

Consider the following statements.
a. Beta-oxidation takes place only in glyoxisomes and not in cytosol.
b. When fatty acids undergo betaoxidation to form acetyl coA, only NADH is produced and not $FADH _2$.
Which of the statements given is/are correct?

biology digestion and absorption liver functions of the liver secretory organs

  1. $1$ only

  2. $2$ only

  3. Both $1$ and $2$

  4. Neither $1$ nor $2$

Show answer
Correct Option: A

Liver is able to manufacture vitamin.

biology digestion and absorption liver functions of the liver secretory organs

  1. $A$

  2. $B$

  3. $K$

  4. $D$

Show answer
Correct Option: C

Which of the following lipoproteins in blood remove excess cholesterol from body cells and transport it to the liver for elimination ?

biology digestion and absorption liver functions of the liver secretory organs

  1. HDL

  2. LDL

  3. VLDL

  4. Both (B) and (C)

Show answer
Correct Option: A

Which of the following is not an excretory organ ???

biology digestion and absorption liver functions of the liver secretory organs

  1. Liver

  2. kidney

  3. Book lungs

  4. Hepatopancreas

Show answer
Correct Option: A

What is the important function of bile ________________.

biology digestion and absorption liver functions of the liver secretory organs

  1. For digestion by emulsification of fats

  2. Elimination of excretory products

  3. For digestion by enzymes

  4. Coordination of digestive activities

Show answer
Correct Option: A

Statement 1: Blood sugar level falls rapidly after hepatectomy.


Statement 2: The glycogen of the liver is the principal source of blood sugar in case of an emergency.

biology digestion and absorption liver functions of the liver secretory organs

  1. Both statements 1 and 2 are correct.

  2. Statement 1 is correct but statement 2 is incorrect.

  3. Statement 1 is incorrect but statement 2 is correct.

  4. Both statements 1 and 2 are incorrect.

Show answer
Correct Option: B
Explanation:
  • In the liver, Glycogen a reserve food material is changed into glucose(sugar) (by gluconeogenesis) and released into the blood. when hepatectomy(surgical removal of the liver) is done it leads to rapid fall of blood sugar. Hence Blood sugar level falls rapidly after hepatectomy is a correct statement.
  • During emergency conditions, the liver can convert proteins and fats i.e gluconeogenesis. Hence The glycogen of the liver is the principal source of blood sugar in case of emergency.is an incorrect statement
  • So, the correct answer is 'Statement 1 is correct but statement 2 is incorrect'.

Which of the following is not a function of the liver in adults?

biology digestion and absorption liver functions of the liver secretory organs

  1. Make red blood cells

  2. Produce urea

  3. Store glucose

  4. Produce bile

Show answer
Correct Option: A
Explanation:
The liver performs a variety of functions such as synthesis, storage and secretion of various substances. The functions performed by the liver are:
  • The liver secretes bile juice.
  • The liver plays a key role in carbohydrates metabolism, in lipid metabolism.
  • It also helps in deamination of proteins and conversion of ammonia into urea.
  •  It is the chief organ of detoxification of toxic substances in food.
  • It acts as a thermoregulatory organ like skeletal muscle. as it has high glucose at its disposal.
  • It acts as a haematopoietic organ in the foetus and erythroclastic organ i.e. destruction of the red blood cells in the adult. Hence, Making of red blood cells is not a function of the liver in adults.
So, the correct answer is 'make red blood cells'.

Twenty-four hours after removing the liver of a mammal the concentrations of urea and amino acids in the blood would be changed in which of the following ways?

biology digestion and absorption liver functions of the liver secretory organs

  1. Both urea and amino acid levels would have risen

  2. There would be no change in the level of either

  3. The amino acid level would have risen while the urea level would have fallen

  4. The urea level would have risen while the amino acid level would have fallen

Show answer
Correct Option: C
Explanation:

Urea is produced in the liver which is a breakdown product of amino acids if the liver is removed amino acids will not be metabolized and urea level will rise.

So, the correct option is 'The amino acid level would have risen while the urea level would have fallen'.