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प्रश्न
Write down the explanation.
Explain why human dentition is considered as thecodont, diphydont and heterodont.
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उत्तर
- Human dentition is described as thecodont, diphyodont and heterodont.
- It is called thecodont type because each tooth is fixed in a separate socket present in the jaw bones by gomphosis type of joint.
- It is called diphyodont type because we get only two sets of teeth, milk teeth and permanent teeth.
- It is called heterodont type because humans have four different type of teeth like incisors, canines, premolars and molars.
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संबंधित प्रश्न
Write names of different parts of human digestive system and explain functions of any three parts.
What is the location and function of the villi?
In human digestive system, bile is secreted by ______.
| 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.
Prepare a possible vegetarian menu for your dinner which would provide all the necessary nutrients.
Define the following term :
Pylorus
Study the following dental formula and then answer the question that follow:
`"i" 3/4 "c" 0/0 "pm" 0/1 "m" 1/1`
State the total number of teeth present in the dentition.
Put a tick (✓) against the most appropriate alternative in the following statement.
The hardest substance in your body?
Fill in the blank.
Molars are meant for _____ the food.
State whether the following statement is True or False.
Saliva changes starch into maltose.
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) |
Name the three regions of the large intestine.
Fill in the blanks.
______ and ______ help in digestion but food does not pass through them.
Answer in detail.
What happens to the nutrients absorbed in the bloodstream from the small intestine?
Define with examples: Carnivores
Describe the following: Emulsification
Mark odd one in the series:
Correct the spellings: Disegion
Eating fast-food ad junk food affects our health. Justify.
Breakdown of food into smaller molecules in our body is known as
Write any two functions of digestive system.
State whether true or false. If false, correct the statement.
During digestion, proteins are broken down into amino acids.
The passage of food into the stomach is controlled by the ______.
Name the organism which lives in the digestive system of human ______.
What is the significance of the emulsification of fats?
Describe the alimentary canal of man.
Cellulose-rich food substances are good source of roughage in human beings because ______.
Read the following passage carefully and answer the questions that follow it.
| Bile juice is stored in a sac called, gall bladder, located near its organ of secretion, liver. The gall bladder releases the bile juice into the small intestine whenever food reaches there. Though bile juice is devoid of any digestive enzymes, it is required for the digestion of fats. The fats cannot be digested easily because they are insoluble in water and are present as large globules. Bile juice breaks down big fat droplets into smaller droplets. These are then easily digested by the enzymes released from the pancreas. |
- Which organ secretes the bile juice?
- Why is digestion of fats difficult as compared to that of other nutrients?
- How does bile juice help in the digestion of fat?
- Where is the digestion of fat completed?
- Does bile juice digest fat completely?
What are villi?
Rearrange the jumbled sequence of the different parts of the alimentary canal in proper sequence, (esophagus, small intestine, stomach, large intestine, anus, mouth, rectum)
