The questions given in NCERT textbooks at the end of each chapter are not only important for examinations but also to get a clear understanding of the concepts in a better way. That is why students are recommended to read NCERT books thoroughly and practice the exercise questions.
Here we are providing NCERT solutions for CBSE class 11 Biology chapter 16 - Digestion and Absorption. All these model solutions have been prepared by the subject experts. So, students who are having trouble finding the right approach to questions given in Class 11 Biology NCERT Chapter -Chemical Reactions and Equations, can follow the answers given here for reference.
Some of the questions and their solutions from NCERT Solutions for Class 11: Digestion and Absorption, are as follows:
Q. Bile juice contains no digestive enzymes, yet it is important for digestion. Why?
Ans. Bile juice is secreted by the liver and acts as a digestive juice. It contains bile salts such as bilirubin and biliverdin which break down large fat globules into smaller globules so that the pancreatic enzymes can easily act on them. This process is known as emulsification of fats. Bile juice also activates lipases.
Q. Describe the digestive role of chymotrypsin. What two other digestive enzymes of the same category are secreted by its source gland?
Ans. Chymotrypsin is the active form of inactive enzyme chymotrypsinogen which is activated by the enzyme trypsin present in the pancreatic juice. Chymotrypsin helps in the further breakdown of the partially-hydrolysed protein, hence completes the digestion of protein. Other two digestive enzymes of the same category secreted by its source gland are trypsin and carboxypeptidases.
Q. What would happen if HCl were not secreted in the stomach?
Ans. Hydrochloric acid is necessary to make the medium acidic which allows inactive enzyme pepsinogen to be converted into pepsin. Pepsin plays an important role in the digestion of proteins. Moreover, it also kills various microbes which may be present in food. These actions would not be possible in the absence of hydrochloric acid.
Q. How does butter in your food gets digested and absorbed in the body?
Ans. Digestion of Butter: Butter is a fat product. It gets digested in the small intestine by the action of bile juice. The bile juice secreted by the liver contains bile salts such as bilirubin and biliverdin which break down large fat globules into smaller globules so that the pancreatic enzymes can easily act on them. This process is known as emulsification of fats. Bile juice also activates lipases. Then, the pancreatic lipase present in the pancreatic juice and the intestinal lipase present in the intestinal juice hydrolyse the fat molecules into triglycerides, diglycerides, monoglycerides, and finally into the simplest form, glycerol which gets diffused into the blood and from the blood stream, to each and every cell of the body.
Get the complete the NCERT solutions for Class 11: Digestion and Absorption, from the following link:
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Class 11 Biology NCERT Chapter: Digestion and Absorption
Before solving the questions given in the Class 11 Biology NCERT chapter- Digestion and Absorption, students should thoroughly read this chapter to grasp all the concepts explained in it. This will help you understand the problem discussed in a question and then come with an appropriate answer.
Main topics discussed in Class 11 Biology chapter: Digestion and Absorption are:
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