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प्रश्न
State the four ways in which saliva is useful to us.
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उत्तर
The four ways in which saliva is useful to us are:
1. Moistens and lubricates the oral cavity and the tongue to make speaking and swallowing easy.
2. Acts as a solvent, dissolving some part of food to stimulate the taste
3. Cleans the mouth and destroys germs
4. Initiates digestion by converting starch into a simpler form, maltose.
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संबंधित प्रश्न
What substance is mixed with food in the mouth during chewing by the teeth?
| The partially digested food coming from the stomach of a person enters a long and narrow organ A in his body. The organ A receives the secretion of two glands : liver and pancreas. Liver secretes a greenish-yellow liquid B which is normally stored in the organ C. Pancreas secretes pancreatic juice which contains three digestive enzymes D, E and F. The intestinal juice completes the process of digestion of food. The inner wall of organ A has millions of tiny finger-like projections G which help in the rapid absorption of digested food into blood stream. The undigested part of food then passes into wider tube H which absorbs most of the water from undigested food. The last part of tube H called I stores this undigested food (or waste) for some time. The undigested food is then passed out though opening J as faeces in the process known as K. |
- Name the organ A.
- Name (i) liquid B, and (ii) organ C.
- What are the digestive enzymes D, E and F?
- Name the projections G present on the inner wall of organ A.
- Name (i) tube H (ii) part I (iii) opening J, and (iv) process K.
Fill in the blank.
Saliva contains salivary amylase which changes starch to _____.
Name different steps involved in animal nutrition. Explain.
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 | ||
The question has four options. Choose the correct answer:
The dental formula of human beings is
Who is telling a lie?
Appendix: Digestion is impossible without me.
In the given histology of the alimentary canal, identify i, ii, and iii.
Cud is the name given to the food of ruminants which is ______.
