Topic: Nutrition in animals.
11. Where is bile produced? Which component of the food does it help to digest?
12. How does digestion take place in ruminants? Explain with the help of a diagram.
13. Name the type of carbohydrate that can be digested by ruminants but not by humans. Give reasons.
14. Draw and label the diagram showing the arrangement of teeth and different types of teeth.
15. Complete the table 2.2 ( page no 13) from text book.
16. List out the various glands associated with digestion in human being.
17. Write the functions of glands present in stomach.
18. What is the role of Hydrochloric acid produced by gastric glands?
19. Draw and label the diagram of digestive system in amoeba.
20. Describe the structure and digestive system in amoeba.
Answers
NCERT Grade 7 Science, Chapter 1, Nutrition in Animals encompasses all the essential concepts associated with the process of Nutrition in Animals. The chapter starts with a basic definition of animal nutrition and familiarizes the students with the term digestion. Thereafter, an introduction to different ways in which animals consume their food is discussed, together with examples of bees and birds. The associated activity talks about various feeding habits of animals and presents it in a tabular format. The major portion of the chapter, Nutrition in Animals is extensively discussed under the label- digestion in humans. For a better understanding, this journey of food is explained in the following parts of the alimentary canal:
Buccal cavity
Oesophagus
Stomach
Small intestine
Large intestine
Anus
Each part is thoroughly explained using labelled diagrams.
A note on additional parts like teeth and tongue as well as sweets and tooth decay are provided separately in the chapter. Labelled diagrams presenting the arrangement of teeth and different types of teeth like incisors, molars, premolars, canines augments the understanding of the concept. The chapter Nutrition in Animals also focuses on a few basic terms like ingestion, diarrhoea, ORS etc. In addition to the above topics, Nutrition in Animals also covers a discussion on the digestion process in grass-eating animals like buffaloes and cows. Such animals are collectively termed as ruminants and their process of digestion as rumination. The concept is explained using a labelled diagram representing their digestive system. Lastly, the digestive system of amoeba is covered with the use of the diagram.
The topics covered in the chapter, Nutrition in Animals are Different Ways of Taking Food, Digestion in Humans, Digestion in grass-eating Animals and Feeding and Digestion in Amoeba.
Page No 20:
Question 1:
Fill in the blanks:
(a) The main steps of nutrition in humans are __________, __________, ___________, __________ and __________
(b) The largest gland in the human body is __________.
(c) The stomach releases hydrochloric acid and ________ juices which act on food.
(d) The inner wall of the small intestine has many finger-like outgrowths called __________.
(e) Amoeba digests its food in the __________.
ANSWER:
(a) The main steps of nutrition in humans are __ingestion__, __digestion__, __absorption__, __assimilation__ and __egestion__.
(b) The largest gland in the human body is __liver__.
(c) The stomach releases hydrochloric acid and __digestive__ juices which act on food.
(d) The inner wall of the small intestine has many finger-like outgrowths called __villi__.
(e) Amoeba digests its food in the _food vacuole_.
Page No 20:
Question 2:
Mark ‘T’ if the statement is true and ‘F’ if it is false:
(a) Digestion of starch starts in the stomach. (T/F)
(b) The tongue helps in mixing food with saliva. (T/F)
(c) The gall bladder temporarily stores bile. (T/F)
(d) The ruminants bring back swallowed grass into their mouth and chew it for some time. (T/F)
ANSWER:
(a) Digestion of starch starts in the stomach. (F)
(b) The tongue helps in mixing food with saliva. (T)
(c) The gall bladder temporarily stores bile. (T)
(d) The ruminants bring back swallowed grass into their mouth and chew it for some time. (T)
Page No 20:
Question 3:
Tick ( √) mark the correct answer in each of the following:
(a) Fat is completely
11. Bile is a fluid that is made and released by the liver and stored in the gallbladder. Bile helps with digestion. It breaks down fats into fatty acids, which can be taken into the body by the digestive tract.
12.The ruminants quickly swallow the grass and store it in a separate part of the stomach called rumen. The rumen is a large sac-like structure between the oesophagus and the small intestine.
13. The name of the carbohydrate is cellulose. It is digested by ruminants but not by humans because enzymes which digest cellulose are not present in humans.
14. see above pic
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