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प्रश्न
Why is the small intestine the most important organ of the digestive system?
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उत्तर
The small intestine is the most important organ of the digestive system as it serves both, for digestion and absorption. It receives two digestive juices; the bile and the pancreatic juice in the duodenum. These two juices virtually complete the digestion of starch, proteins, carbohydrates, etc. After the breakdown of food, the small intestine absorbs simple substances such as glucose, amino acids, etc.
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संबंधित प्रश्न
Name any four life processes in living things.
Carbohydrates are bodybuilding nutrients.
Which of the organs performs the function in humans?
Absorption of food
Which part of the body secretes bile?
| If the teeth are not cleaned regularly, they become covered with a sticky yellowish layer W of food particles and bacteria. Since layer W covers the teeth, the alkaline liquid X secreted by glands Y inside the mouth cannot reach the teeth surface to neutralise the acid formed by the action of organisms Z on sugary food, and hence tooth decay sets in. |
- What is W known as?
- What are (i) X and (ii) Y?
- What are organisms Z?
- State one way of removing layer W from the teeth.
Put a tick (✓) against the most appropriate alternative in the following statement.
Saliva converts starch into:
Fill in the blank.
In an adult human, there are a total of ___ teeth.
Fill in the blanks in the table (1-5) by selecting the suitable names of substances from the list given below:
(steapsin, peptones, fatty acids, proteoses, protein).
| Digestive Enzymes | Acts on | To convert into |
| (i) Pepsin | _________(2) | ________(3) and |
| (ii) _______(1) | Fats |
________(4) _________(5) |
Fill in the blank.
Saliva contains salivary amylase which changes starch to _____.
Define with examples: Heterotrophs
Describe the digestion of food in small intestine.
Mark odd one in the series:
The question has four options. Choose the correct answer:
The dental formula of human beings is
Name the organs of the digestive system
What makes respiration and blood circulation go on all the time, and the processes of digestion happen at the right time?
A fluid containing the digestive enzyme ____________ is secreted by the serous cells of salivary gland.
Observe the diagram of Human digestive system.
Match the labeling referred in column I and correlate with the function in column II.
| Column I | Column II | |
| i. | a. | The length of this depends on food the organism eats. |
| ii. | b. | Initial phase of starch digestion |
| iii. | c. | Increase the efficiency of lipase enzyme action |
| iv. | d. | This is the site of the complete digestion of carbohydrates, proteins and fats. |
What is digestion?
Why do we eat?
In human beings, when the process of digestion is completed, the (i) proteins, (ii) carbohydrates and (iii) fats are respectively finally converted into ______.
