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Question 27
Read the following passage carefully and answer the questions that follows it.

Bile juice is stored in a sac called the gall bladder, located near its organ of secretion that is the liver. The gall bladder releases the bile juice into the small intestine whenever food reaches there. Though bile juice is devoid of any digestive enzymes, it is required for the digestion of fats. The fats cannot be digested easily because they are insoluble in water and are present as large globules. Bile juice breaks down big fat droplets into smaller droplets. These are then easily digested by the enzymes released by the pancreas.

(a) Which organ secretes the bile juice?

(b) Why is digestion of fats difficult as compared to that of other nutrients?

(c) How does bile juice help in digestion of fat?

(d) Where is the digestion of fat completed?

(e) Does bile juice digest fat completely?


Solution

(a) Liver, it is the largest gland present in the human body. It secretes bile juice which is stored in the gall bladder temporarily and helps in the digestion of fats.

(b) Fat compared to other nutrients like carbohydrates and proteins, is insoluble in water. The insolubility of fat in water makes its digestion difficult. Fats are present as large globules.

(c) The gall bladder releases the bile juice into the small intestine whenever the food reaches there. Fats are present as large globules. Bile juice breaks down big fat droplets into smaller droplets. These are then digested by the enzymes released by the pancreas.

(d) The part of digestive canal involved in the complete digestion of nutrients present in the food is the small intestine. The intestinal juices present in the lower part of the small intestine is responsible for the complete digestion of nutrients such as carbohydrates, proteins, fats present in the food. The carbohydrates get broken into simple sugars such as glucose, fats into fatty acids and glycerol and proteins into amino acids in the small intestine.

(e) No, bile juice does not digest fat completely. Bile juice secreted by the liver is devoid of any digestive enzymes, but it helps in the digestion of fats. Fats are present as large globules and are insoluble in water. The bile juice breaks down the big fat globules into smaller globules. These are then easily digested by the enzymes released by the pancreas.


Biology
NCERT Exemplar
Standard VII

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