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Life Processes Test - 43

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Life Processes Test - 43
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  • Question 1
    1 / -0
    Intestinal villi are mainly concerned with
    Solution
    The villi and microvilli, with their many folds of finger-like projection, present on the lining of the small intestine, increase the surface area of the intestine for more absorption of the nutrients.
  • Question 2
    1 / -0
    Bile synthesis occurs in

  • Question 3
    1 / -0
    The functional unit for absorption of digested food is:
    Solution
    The lining of the small intestine is provided with many folds. These folds have finger-like projections called villi. These increase the surface area of the small intestine for more absorption of the nutrients from the digested food.
    So, the correct answer is option C.
  • Question 4
    1 / -0
     Which of the following helps in protein digestion?
    Solution
    • The pancreas secretes pancreatic juice. The pancreatic juice contains the following enzymes trypsinogen, chymotrypsinogen, procarboxypeptidases, amylases, lipases and nucleases. 
    • The proteolytic enzymes of pancreatic juice trypsin, chymotrypsin and carboxypeptidase convert proteins, peptones and proteases into dipeptides in the small intestine. Hence pancreatic juice helps in protein digestion.
    • So, the correct answer is 'Pancreatic juice'.
  • Question 5
    1 / -0
    Which word best describes the action of bile on fats?
    Solution
    Bile makes fat globules smaller so that they are easier to digest. Bile acts on the acidic food in the duodenum and neutralizes it. Bile salts emulsifies fat.
    Thus, the correct answer is option C
  • Question 6
    1 / -0
    The instrument by which blood pressure of a man is determined
    Solution
    A sphygmomanometer is an instrument attached to an inflatable air bladder cuff and used with a stethoscope, for measuring blood pressure in an artery. It is estimated with reference to mmHg.
    So, the correct answer is option A.
  • Question 7
    1 / -0
    Bile juices help in digesting ___________.
    Solution
    Bile juices produced from the liver, have bile salts that help in digesting fats. They help in fat emulsification.  
    Fats are in the form of large globules in the food. It is difficult for enzymes of the small intestine, to act on them. Bile salts break them down into smaller globules increasing the efficiency of enzyme action.
  • Question 8
    1 / -0
    A young infant may be feeding entirely on mother's milk, which is white in colour but the stool, which the infant passes out is quite yellowish. What is the reason for this yellow colour?
    Solution
    A bile pigment called stercobilin is responsible for the brown colour of human faeces. These pigments are formed as a result of the breakdown of the heme of hemoglobin found in erythrocytes. Macrophages break the heme into biliverdin, which rapidly reduces to free bilirubin. This bilirubin is further converted to colourless urobilinogen and finally oxidized to stercobilin. Stercobilin is then excreted in the faeces.
    So, the correct answer is B.
  • Question 9
    1 / -0
    Which cells cannot be considered as true cells?
    Solution
    Blood is a fluid connective tissue. It is composed of a matrix called the plasma and formed elements. These formed elements include erythrocytes, leucocytes, and platelets. Out of these three types of cells, platelets are not true blood cells. These are cytoplasmic fragments of larger precursor cells called Megakaryocytes.
    So, the correct answer is option A, 'Platelets.'
  • Question 10
    1 / -0
    The special feature of bile juice is that:
    Solution
    • Bile helps in breaking fats into small fat globules; a process called emulsification of fats. The enzyme lipase present in the pancreatic juice can then act on these small fat globules to break them into simpler components.
    • Amylase, lipase, and pectinase are not present in the bile juice.
    • Thus, the correct answer is option A, i.e., It has no enzyme. 
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