Tag: digestion and absorption

Quizzes (37) Questions (218)

Questions Related to digestion and absorption

Multiple choice biology digestion and absorption liver functions of the liver secretory organs

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

  1. Ammonia

  2. Protein

  3. Uric acid

  4. Urea
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice biology digestion and absorption liver functions of the liver secretory organs

Lymphocytes of lower vertebrates are produced in

  1. Liver

  2. Spleen

  3. Bone marrow

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

In many lower vertebrates, the liver serves as a hematopoietic organ, producing various blood cells including lymphocytes, unlike in mammals where this is primarily the role of bone marrow.

Multiple choice biology digestion and absorption liver functions of the liver secretory organs

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?

  1. $1$ only
  2. $2$ only
  3. Both $1$ and $2$
  4. Neither $1$ nor $2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Beta-oxidation occurs in the mitochondria and peroxisomes (not just glyoxisomes) of the cytosol. During beta-oxidation, both NADH and FADH2 are produced in each cycle.

Multiple choice biology digestion and absorption liver functions of the liver secretory organs

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

  1. HDL

  2. LDL

  3. VLDL

  4. Both (B) and (C)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

High-density lipoprotein (HDL) is known as 'good cholesterol' because it transports cholesterol from tissues back to the liver for excretion or recycling.

Multiple choice biology digestion and absorption liver functions of the liver secretory organs

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

  1. Liver

  2. kidney

  3. Book lungs

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

The liver is a metabolic and detoxification organ. While it processes waste for excretion, it is not classified as an excretory organ in the same sense as the kidneys, lungs, or skin.

Multiple choice biology digestion and absorption liver functions of the liver secretory organs

What is the important function of bile ________________.

  1. For digestion by emulsification of fats

  2. Elimination of excretory products

  3. For digestion by enzymes

  4. Coordination of digestive activities
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bile's primary function is the emulsification of fats, which increases the surface area for lipase to act upon, facilitating digestion.

Multiple choice biology digestion and absorption liver functions of the liver secretory organs

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.

  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.
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.
Multiple choice biology digestion and absorption liver functions of the liver secretory organs

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

  1. Make red blood cells

  2. Produce urea

  3. Store glucose

  4. Produce bile
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice biology digestion and absorption liver functions of the liver secretory organs

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?

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.