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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
Write names of different parts of human digestive system and explain functions of any three parts.
The largest gland in the human body is ______.
Name the enzyme present in human saliva. What type of food material is digested by this enzyme?
What substances are contained in pancreatic juice? What are their functions?
Pancreatic juice contains enzymes which digest:
(a) proteins and carbohydrates only
(b) proteins and fats only
(c) fats and carbohydrates only
(d) proteins, fats and carbohydrates
Where are proteins first digested in the alimentary canal?
(a) small intestine
(b) oesophagus
(c) mouth
(d) stomach
Which of the following are the correct functions of two components of pancreatic juice trypsin and lipase?
(a) trypsin digests proteins and lipase carbohydrates
(b) trypsin digests emulsified fats and lipase proteins
(c) trypsin digests starch and lipase fats
(d) trypsin digests proteins and lipase emulsified fats
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.
(a) What is (i) gland A (ii) substance B, and (iii) enzyme C?
(b) Name the tube D.
(c) What is the movement E known as?
(d) What are (i) F (ii) G, and (iii) H?
Put a tick (✓) against the most appropriate alternative in the following statement.
Saliva converts starch into:
Differentiate between
Digestion and Absorption
Answer in detail.
Name the four types of teeth and their functions
Define with examples: Omnivores
Define with examples: Herbivores
Name the enzymes secreted by the following: Salivary glands
The question has four options. Choose the correct answer:
Trypsin is connected with the digestion of
Identify the salivary gland lying below the tongue.
Liver transports nutrients, oxygen, wastes, and hormones.
Draw the diagram of the alimentary canal of man and label the following parts. Mouth, Oesophagus, Stomach, Intestine.
Read carefully the terms given below. Which of the following set is the correct combination of organs that do not carry out any digestive functions?
Urea is a main excretory product in humans. How is it formed?
