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प्रश्न
What is digestion? Why do only animals require a digestive system?
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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.
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संबंधित प्रश्न
Which part of the digestive canal is involved in:
Formation of faeces ______.
What is the other same of food pipe?
An enzyme secreted by gastric glands in stomach which acts on proteins.
Name the hormone that helps in regulating level of sugar in our blood. Name the gland that secrets it.
Define the following term:
Peristalsis
What is the role of the liver and the pancreas respectively in the digestion of food?
Food are classified into three groups on the basis of the function they perform in our body. Name the three categories, and briefly give their functions. Also give their two sources each.
Give reasons for the following:
All teeth in the mouth are not alike.
Match items in column A with the appropriate items in Column B:
| Column A | Column B | ||
| 1 | HCl | a | Lactose |
| 2 | Rennin | b | Pellagra |
| 3 | Enteropeptidase | c | Rumen |
| 4 | Cellulose | d | Pepsin |
| 5 | Ptyalin | e | Starch |
| 6 | Vitamin | f | Pernicious anaemia |
| 7 | Intestinal juice | g | Trypsin |
| 8 | Bile salt | h | Casein |
| 9 | Vitamin A | i | Micelle |
| 10 | Goitre | j | Night-blindness |
| k | Iodine | ||
Describe the digestion of starch.
The question has four options. Choose the correct answer:
Parotid salivary glands occur
Who is telling a lie?
Liver: I am the largest gland in the body.
What makes respiration and blood circulation go on all the time, and the processes of digestion happen at the right time?
The other name of food pipe is alimentary canal.
A fluid containing the digestive enzyme ____________ is secreted by the serous cells of salivary gland.
A gland not associated with the alimentary canal is ____________.
Explain the role of the mouth in digestion of food.
Digestion of food starts in ______ and gets completed in ______.
In which layer of the wall of alimentary canal, secretary glands are present?
