Case Study Questions Class 7 Science Chapter 8 Nutrition in Animals
CBSE Class 7 Case Study Questions Science Nutrition in Animals. Important Case Study Questions for Class 7 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Nutrition in Animals.
At Case Study Questions there will given a Paragraph. In where some Important Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks, 4 marks.
CBSE Case Study Questions Class 7 Science Nutrition in Animals
Case study 1
Plants can prepare their own food by the process of photosynthesis but animals cannot. Animals get their food from plants, either directly by eating plants or indirectly by eatinganimals that eat plants. Some animals eat both plants and animals. Recall that all organisms including humans require food for growth, repair and functioning of the body.
Animal nutrition includes nutrient requirement, mode of intake of food and its utilisation in the body. The components of food such as carbohydrates are complex substances.These complex substances cannot be utilised as such. So they are broken down into simpler substances. The breakdown of complex components of food into simpler substances is called digestion.
Que 1) Humans require…………………………………………………..……..……………for growth and repair of cells and tissues in the body.
(a) Plants
(b) Protein
(c) Fat
(d) Food
Que. 2) Plants can prepare food by the process ofcapturing of sunlight with help of chlorophyll and this process is known as ……………………………………………………………….………………………….
(a) Metabolism
(b) Catabolism
(c) Photosynthesis
(d) Digestion
Que. 3) Carbohydrates are………………………………..…..…………………………………substances.
(a) Simple
(b) Complex
(c) Digestible
(d) Fatty
Que. 4) Define digestion.
Que. 5) How do animals get their food?
Answer Key
Que. 1)(d) Food
Que. 2) (c) Photosynthesis
Que. 3) (b) Complex
Que. 4) Answer: Digestion is process of breakdown of complex food substances into simpler substances.
Que. 5) Answer: Animals get their food by either eating plants or by eating animals who depends on plants for their nutrition.
Case study 2
The food passes through a continuous canal which begins at the buccal cavity andends at the anus. The canal can be divided into various compartments: (1) the buccal cavity, (2) food pipe or oesophagus, (3) stomach, (4) small intestine, (5) large intestine ending in the rectum and (6) the anus. Is it not a very long path. These parts togetherform the alimentary canal (digestive tract). The food components gradually get digested as food travels through the various compartments. The inner walls of the stomach and the small intestine, and the various glands associated with the canal such as salivary glands, the liver and the pancreas secrete digestive juices.The digestive juices convert complexsubstances of food into simpler ones. Thedigestive tract and the associated glandstogether constitute the digestive system.
Que. 1) The food passes through an alimentary canal which is a……………………………………………………………………………………… type ofcanal.
(a) Discontinuous
(b) Continuous
(c) Straight
(d) Round
Que. 2) Which parts or glands of the human body secretes the digestive juices which are required for the breakdown of food in the body?
(a) Liver
(b) Pancreas
(c) Salivary gland
(d) All of the above
Que. 3) ……………………………………….…………………………………………..juice convert complex food substances into simpler ones.
(a) Digestive juice
(b) Pancreatic juice
(c) Liver juice
(d) Salivary juice
Que. 4) The canal can be divided into how many compartments?
Que. 5) Name the glands which are associated with the canal?
Answer Key
Que. 1)(b) Continuous
Que. 2) (d) All of the above
Que. 3) (a) Digestive juice
Que. 4) Answer: The canal can be divided into 6 compartments i.e.(1) buccal cavity, (2) oesophagus, (3) stomach, (4) small intestine, (5) large intestine and (6) the anus
Que. 5) Answer: Glands such as salivary glands, the liver and the pancreas are associated with the canal.
Case study 3
Normally bacteria are present in our mouth but they are not harmful to us. However, if we do not clean our teeth and mouth after eating, many harmful bacteria also begin to live and grow in it. These bacteriabreak down the sugars present from the leftover food and release acids. The acids gradually damage the teeth. This is called tooth decay. If it is not treated in time, it causes severe toothache and in extreme cases results in tooth loss. Chocolates, sweets, soft drinks and other sugar products are the major culprits of tooth decay.
Therefore, one should clean the teeth with a brush or datun and dental floss (a special strong thread which is moved between two teeth to take out trapped food particles) at least twice a day and rinse the mouth after every meal. Also, one should not put dirty fingers or any unwashed object in the mouth.
Que. 1) Normally Bacteria that are present in human mouth are ………………………………………………………………………….. to the human teeth.
(a) Harmful
(b) Not harmful
(c) Good
(d) None of the above
Que. 2) The bacteria breakdown………………………………….……………………………substances present in the leftover of food.
(a) Sugars
(b) Acids
(c) Protein
(d) All of the above
Que. 3) One should not put…………………………………………………………………………………in the mouth.
(a) Dirty fingers
(b) Dirty food
(c) Plastic
(d) Germs
Que. 4) What are the major culprits of tooth decay?
Que. 5) How many times the teeth should be cleaned and why.
Answer Key
Que. 1)(b) Not harmful
Que. 2) (a) Sugars
Que. 3) (a) Dirty fingers
Que. 4) Answer: sweets, junk food, chocolates, soft drinks and other sugar containing products are the culprits of tooth decay.
Que. 5) Answer: The teeth should be cleaned at least twice a day to prevent any kind of tooth decay.
Case study 4
The working of the stomach was discovered by a strange accident. In 1822, a man named Alexis St. Martin was badly hit by a shot gun. The bullet hadseriously damaged the chest wall and made a hole in his stomach. He was brought to an American army doctor William Beaumont. The doctor saved the patient but he could not close the hole properly and left it bandaged. Beaumont took it as a great opportunity to see the inside of the stomach through the hole. He made some wonderful observations.
Beaumont found that the stomach was churning food. Its wall secreted a fluid which could digestthe food. He also observed that the end of the stomach opens into the intestineonly after the digestion of the food inside the stomach is completed.
Que. 1) The working of stomach was found by……………………………………………………………..………………………………….
(a) William Beaumont
(b) Alexis St. Martin
(c) Both (a)&(b)
(d) None of the above
Que. 2) Alexis St. Martin was badly hit by a……………………………………………..……………………………. weapon which caused a fatal wound in his chest and stomach.
(a) Gun
(b) Shot gun
(c) Bullet
(d) All of the above
Que. 3) William Beaumont was from which country
(a) Africa
(b) Russia
(c) America
(d) Australia
Que. 4) What did Beaumont found?
Que. 5) Why did a hole formed in the stomach of Alexis St. Martin?
Answer Key
Que. 1)(a) William Beaumont
Que. 2) (b) Shot gun
Que. 3) (c) America
Que. 4) Answer: He found that the stomach was churning food and also secreted some type fluid to digest the food.
Que. 5) Answer: The whole was formed in the stomach of Alexis St. Martin because he got a hit from a shot gun and the bullet damaged the chest wall and finally a whole in the stomach.
Case study 5
The stomach is a thick-walled bag. Its shape is like a flattened J and it is the widest part of the alimentary canal. It receives food from the food pipe at one end and opens into the small intestine at the other. The inner lining of the stomach secretes mucous, hydrochloric acid and digestive juices. The mucous protects the lining of the stomach.
The acid kills many bacteria that enter along with the food and makes the medium in thestomach acidic and helps the digestive juices to act. The digestive juices breakdown the proteins into simpler substances.
Que. 1) The stomach is a………………………………………………………………………………………..bag.
(a) Thin walled
(b) Thick walled
(c) Round
(d) J shaped
Que. 2) The……………………………………………………………………………….…..protects the lining of the stomach.
(a) Fluid
(b) Membrane
(c) Mucous
(d) None of the above
Que. 3) Which is the widest part of alimentary canal of the human digestive system that is used for churning of food in the body?
(a) Liver
(b) Intestine
(c) Stomach
(d) Food pipe
Que. 4) What is the function of acid in the stomach?
Que. 5) What does the inner lining of the stomach secretes?
Answer Key
Que. 1) (b) Thick walled
Que. 2) (c) Mucous
Que. 3) (c) Stomach
Que. 4) Answer: The acid kills many forms of bacteria that comes inside the stomach with food and makes the medium in stomach acidic which helps to activate various digestive enzymes.
Que. 5) Answer: The inner lining of stomach secretes various digestive enzymes, hydrochloric acid and mucous.
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