Class 7 Science - Chapter Nutrition in Animals NCERT Solutions | Label Fig. 2.11 of the digestive system.
Label Fig. 2.11 of the digestive system.
| Part Name | Work |
|---|---|
| Salivary glands | Saliva secretion |
| Stomach | Acid release |
| Liver | Bile juice secretion |
| Rectum | Storage of undigested food |
| Small Intestine | Digestion is completed |
| Large Intestine | Absorption of water |
| Anus | Release of faeces |
1. Salivary glands: The salivary glands in mammals are exocrine glands that produce saliva through a system of ducts. Humans have three paired major salivary glands (parotid, submandibular, and sublingual), a pair of seromucous tubarial glands (discovered in 2020) as well hundreds of minor salivary glands.
2. Stomach: Stomach is a muscular organ located on the left side of the upper abdomen. The stomach receives food from the oesophagus. As food reaches the end of the oesophagus, it enters the stomach through a muscular valve called the lower oesophagus sphincter. The stomach secretes acid and enzymes that digest food.
3. Liver: The liver is an organ only found in vertebrates which detoxifies various metabolites, synthesizes proteins and produces biochemical necessary for digestion and growth. In humans, it is located in the right upper quadrant of the abdomen.
4. Rectum: The rectum is a chamber that begins at the end of the large intestine, immediately following the sigmoid colon, and ends at the anus. Ordinarily, the rectum is empty because stool is stored higher in the descending colon.
5. Small Intestine: The small intestine or small bowel is an organ in gastrointestinal tract where most of the end absorption of nutrients and minerals from food takes place. It lies between the stomach and large intestine, and receives bile and pancreatic juice through the pancreatic duct to aid in digestion.
6. Large Intestine: The large intestine, also known as the large bowel, is the last part of the gastrointestinal tract and of the digestive system in vertebrates. Water is absorbed here and the remaining waste material is stored as faeces before being removed by defecation.
7. Anus: The anus is the opening where the gastrointestinal tract ends and exits the body. The anus starts at the bottom of the rectum, the last portion of the colon (large intestine). The anorectal line separates the anus from the rectum. Tough tissue called fascia surrounds the anus and attaches it to nearby structures.
More Questions From Class 7 Science - Chapter Nutrition in Animals
- Q:-
Write one similarity and one difference between the nutrition in amoeba and human beings.
- Q:-
Can we survive only on raw, leafy vegetables/grass? Discuss.
- Q:-
Which part of the digestive canal is involved in:
(i) absorption of food ________________.
(ii) chewing of food ________________.
(iii) killing of bacteria ________________.
(iv) complete digestion of food ________________.
(v) formation of faeces ________________. - Q:-
Match the items of Column I with suitable items in Column II
Column I Column II
(a) Salivary gland (i) Bile juice secretion
(b) Stomach (ii) Storage of undigested food
(c) Liver (iii) Saliva secretion
(d) Rectum (iv) Acid release
(e) Small intestine (v) Digestion is completed
(f ) Large intestine (vi) Absorption of water
(vii) Release of faeces - Q:-
Name the type of carbohydrate that can be digested by ruminants but not by humans. Give the reason also.
- Q:-
Match the items of Column I with those given in Column II:
Column I Column II
Food components Product(s) of digestion
Carbohydrates Fatty acids and glycerol
Proteins Sugar
Fats Amino acids - Q:-
Why do we get instant energy from glucose?
- Q:-
Tick (✓) mark the correct answer in each of the following:
(a) Fat is completely digested in the
(i) stomach (ii) mouth (iii) small intestine (iv) large intestine(b) Water from the undigested food is absorbed mainly in the
(i) stomach (ii) foodpipe (iii) small intestine (iv) large intestine - Q:-
Where is the bile produced? Which component of the food does it help to digest?
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What are villi? What is their location and function?
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Classify the changes involved in the following processes as physical or chemical changes:
(a) Photosynthesis
(b) Dissolving sugar in water
(c) Burning of coal
(d) Melting of wax
(e) Beating aluminium to make aluminium foil
(f ) Digestion of food - Q:-
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(b) Winds are generated due to —————— heating on the earth.
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Column I Column II
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(iv) Phloem (d) Transport of water
(e) Synthesis of carbohydrates - Q:-
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(d) The fusion of male and female gametes is termed as _____________.
(e) Seed dispersal takes place by means of _____________, _____________ and _____________. - Q:-
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(i) Motion of your hands while running.
(ii) Motion of a horse pulling a cart on a straight road.
(iii) Motion of a child in a merry-go-round.
(iv) Motion of a child on a see-saw.
(v) Motion of the hammer of an electric bell.
(vi) Motion of a train on a straight bridge.
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Column I Column II
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