Advertisements
Advertisements
प्रश्न
What is digestion? Why do only animals require a digestive system?
Advertisements
उत्तर
Digestion is the process of breaking down complex food materials into simpler substances by the action of enzymes.
Need for a digestive system:
(i) Large complex molecules like carbohydrates, proteins and lipids need to be broken down to simpler molecules. These simpler molecules can then be absorbed and utilized by the body.
(ii) The breaking down of complex food molecules into their simpler form is possible only through the process of digestion.
(iii) During digestion, large complex macromolecules present in food are converted into small simpler molecules, which can be simplified in different compartments of digestive system only.
APPEARS IN
संबंधित प्रश्न
Write names of different parts of human digestive system and explain functions of any three parts.
Fat is completely digested in the ______.
Match the items of Column I with suitable items in Column II.
| Column I | Column II | ||
| (a) | Salivary gland | (i) | Bile juice secretion |
| (b) | Stomach | (ii) | Storage of undigested food |
| (c) | Liver | (iii) | Saliva secretion |
| (d) | Rectum | (iv) | Acid release |
| (e) | Small intestine | (v) | Digestion is completed |
| (f) | Large intestine | (vi) | Absorption of water |
| (vii) | Release of faeces |
What is the name of the opening in the human body through which undigested food is thrown out?
Which of the following has the longest small intestine?
Which part of alimentary canal receives bile from the liver?
What is roughage? Give two examples.
Give two reasons to explain why the absorption of digested food occurs mainly in the small intestine.
Answer the following question.
Write two different ways in which glucose is oxidized to provide energy in the human body. Write the products formed in each case.
Define the term nutrition.
Write true or false for the below statement. Rewrite the false statements correctly.
The removal of faeces through the anus is called excretion.
Correct the spellings: Disegion
How do the salivary glands come to know that there is food in the mouth and it is time to secrete saliva?
Name the salivary glands in our mouth?
The common bile duct and pancreatic form ______.
Choose the correct order of terms that describes the process of nutrition in ruminants.
What are the end products of digestion of starch, proteins, and fats respectively?
Given below are two columns, Column I shows enzymes secreted by the glands in the alimentary canal of human beings and Column II indicates the components of food on which enzymes act. Choose the options showing correct matching:
Give two reasons, why bile juice is considered to be an important secretion of liver in the process of digestion?
