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प्रश्न
Cellulose-rich food substances are good source of roughage in human beings because ______.
विकल्प
human beings do not have cellulose-digesting enzymes.
cellulose gets absorbed in the human blood and converts into fibres.
the cellulose-digesting bacteria convert cellulose into fibres.
cellulose breaks down into smaller components which are egested as roughage.
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उत्तर
Cellulose-rich food substances are good source of roughage in human beings because human beings do not have cellulose-digesting enzymes.
Explanation:
Human beings do not have cellulose-digesting enzymes in their bodies and are therefore unable to digest cellulose. Since it is not digested, it passes down the entire digestive tract from mouth to anus. It acts as roughage, adds bulk to the food and helps the body to easily get rid of undigested food.
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संबंधित प्रश्न
The largest gland in the human body is ______.
The inner wall of the small intestine has many finger-like outgrowths called ______.
The gall bladder temporarily stores bile.
The inner lining of stomach is protected by one of the following from the harmful effect of hydrochloric acid. This is ______.
Which part of alimentary canal receives bile from the liver?
| When a person puts food in his mouth, then teeth cut it into small pieces, chew and grind it. The glands A in the mouth secrete a substance B which is mixed with the food by tongue. The substance B contains an enzyme C which starts the digestion of food in the mouth. The slightly digested food from the mouth goes down a tube D. The special type of movements E in the walls of tube D push the food into stomach for further digestion. The stomach wall secretes gastric juice containing three substance F, G and H. One of the functions of F is to kill bacteria which may enter the stomach with food. The substance G protects the inside layer of stomach from the damaging effect of substance F whereas substance H is and enzyme for digestion. The partially digested food then enters into small intestine for further digestion. |
- What are (i) gland A, (ii) substance B, and (iii) enzyme C?
- Name the tube D.
- What is the movement E known as?
- What are (i) F, (ii) G, and (iii) H?
List two different functions performed by the pancreas in our body.
Write the function of the following in the human alimentary canal:
Saliva
Write the function of the following in the human alimentary canal:
HCl in stomach
Write one function each of the following enzymes:
Lipase
State whether the following statement is True or False.
The ducts from the salivary glands open into the duodenum.
Find the odd one out. Give reasons for your choice
Correct the spellings: Caceum
Who is telling a lie?
Appendix: Digestion is impossible without me.
Which systems work together to provide the body with energy?
Observe the diagram. This is the histological structure of the stomach. Identify and comment on the significance of the layer marked by an arrow.
What is the length of the alimentary canal?
Liver transports nutrients, oxygen, wastes, and hormones.
Choose the odd one:
The complete digestion and absorption of nutrients is done by the small intestine. Which of the following greatly enhances the process of absorbtion?
