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Subject:

science-biology

Class:

class VII

Key Concepts

complex food substances, digestion, fatty acids, feeding, teeth, digestion in micro organisms, absorption of food, ORS oral re-hydration solution, digestive organs

essential questions

1.How do animals digest the food they take in?
2. Why do different types of organisms eat different kinds of food?
3. What happens to the food when it goes inside our stomach?

Remembering:

  1. Which of the following are sources of vitamins and minerals. They can be source for more than one vitamins or minerals. : Cheese,  cereals, meat, milk, cabbage, Guava, chilli, egg yolk, liver, fish
  2. Which of the following mineral is required for healthy teeth and bones? a) iron   b) calcium  c) Sodium   d) Magnesium
  3. The longest part of alimentary canal is: a) oesophagus  b) large intestine  c) small intestine  d) stomach
  4. The salivary glands secrete: a) amylase  b) pepsin c) trypsin d) bile juice
  5. Our stomach is located: a) on the right hand side of kidney   b) on the left side of the liver   c) on the right side of the liver   d) on the sides of kidney
  6. Write the following digestion process in correct order: Egestion- digestion- absorption- assimilation- ingestion
  7. Associated digestive glands are ________: a) salivary glands and stomach   b) pancreas & gall bladder  c) liver and pharynx    d)large and small intestines
  8. Mumps is a painful disease that happens due to swelling of : a) parotid glands   b) sub- lingual glands   c) sub- mandibular gland
  9. Most of the animals take food in the form of solids and this process of nutrition is called  a) holozoic nutrition   b)  parasitic nutrition   c)  saprozoic nutrition   d) symbiotic nutrition
  10. Paheli wants to know the name of the organ that releases digestive juice into the small intestine?  a) liver  b)  stomach  c) pancreas  d) gall bladder
  11. Eating one’s own faecal material is known as_________ a) corpophagy  b) villi   c) digestion   d) absorption of nutrient
  12. Fill in the blanks:
    1. The process of incorporation of absorbed food into cell components is called_______
    2. The layer next to enamel is called______
    3. Food pipe is also called as______
    4. Process of changing food to a usable form is called______
    5. Skin helps in the excretion of water and ____
    6. Glucose breaksdown with the help of ______ into carbon di oxide and water, and energy is released.
    7. Large intestine is about _____ in lenght
    8. The fecal matter is removed through the anus from time to time. This is called______
    9. Saliva contains the enzyme amylase also known as______ that breaks starch into ________ and dextrin.
    10. When we put benedict solution in a test tube with sugar solution, the color will change to _______
    11. The top of the tongue is rough and bumpy and these bumps are called ________
    12. Pharynx is branched into the ____and the ______
    13. Oesophagus is _________ cm long, connecting mouth to stomach.
    14. Two main digestive enzymes produced by the stomach _______ and ______
    15. Match the following :

a)These set of teeth are used for cutting and biting food                                         i) molars

b)We use them for chewing                                                                                             ii) canine

c)These are 12 in number and are used for chewing and grinding                           iii) Premolar

d)These are the lowest in number that is 4 & need them to tear the food we eat.  iv)incisors

 

 

understanding:

  1. In which of the statements is or are incorrect, about eating habits of animals?  a) animals that obtain their food by killing other animals, called scavengers  b)  organisms that obtain their food from other animals either by living inside or outside their body, called parasite  c) animals that consume plants as well as other animals as their food, called omnivorous  d)  animals that obtain their food only from plants, called
  2. Read the statement which is related to digestive system and choose a word for it: “transportation of absorbed food of different parts of body and their utilization” a) assimilation  b) absorption  c) respiration d) digestion herbivorous.
  3.  the acid present in the stomach  a ) kills the harmful bacteria that may enter along with the food  b) protects the stomach lining from harmful substances  c) digest starch into simpler sugars   d) make the medium alkaline
  4.  Boojho wants to know the name of insects which has piercing and sucking mouth parts that pierce food items to enable sucking of internal fluids?  a) mosquito   b) housefly   c) cockroach   d) ant
  5. Which of the following statements is or are incorrect, about “human digestive system”? a) food is pushed into the stomach by the peristaltic movement  b) in humans, the small intestine is about 6 metre and large intestine is about 1.5 metre long c) the villi increase the surface area for absorption of the digested food  d) none of the above.
  6. Mark true and false:  a) Digestion is the mechanical and chemical breakdown of food into smaller components that are more easily absorbed into blood stream. b)Refined sugars are simple carbohydrates and wheat is a complex carbohydrate because it is starch.  c) Vitamins A, D, E and K are found in fats.
  7. The function of mucous in stomach is to:    a) protect the lining of the stomach    b) provide medium for activity of enzymes  c) is required for secretion of hydrochloric acid   d) none of these
  8. What makes our food easier to swallow: a) tongue movements  b) saliva   c) saliva and chewing  d) saliva, chewing, tongue movement
  9. Pancreas produce a hormone ________that regulates blood sugar: a) trypsin  b) pancreatic amylase c) pancreatic lipase  d) insulin
  10. ______ is the main site for absorption of nutrients in the body: a) Ileum  b) jejunum  c) duodenum  d) small intestines

 

Application:

  1.  Why is liver and pancreas an important part of the digestive system?
  2. Is gall bladder a very important part of the body? Give reasons for your answer.
  3. What would happen if insulin secretion reduces in the body? Why is it important to maintain the insulin balance in the body?
  4. What causes ulcer in the stomach? How can we prevent that?
  5. If we stand upside down, food will remain in our stomach. Give reasons for this.
  6. Paheli had two test tubes A & B. She wanted to check protein in those test tubes. She added a solution to the test tube. Test tube A turned reddish brown. There was no reaction in test tube B. Can you tell what was name of the solution used and which test tube had proteins in it.
Vitamin A Vitamin C Vitamin K Minerals  VitmainD

 

Analysis:

  1. There are given some parts of our body, choose the odd one out a) tongue  b) absorption  c) taste   d) swallow
  2. They are given some parts of the digestive system, choose the odd one  a) oesophagus   b) small intestine   c) large intestine  d) rectum
  3. Which of the statement is or are incorrect about “teeth”?  a) premolar are four in numbers and help in chewing and grinding the food  b) canine are four in numbers and help in piercing and tearing of food c) incisors are two in numbers and help to cut and bite food  d)  none of the above
  4. Examine the two statements carefully and decide if the assertion A and reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Assertion A: tongue is a fleshy muscular organ    Reason R: Tongue is used for talking   a) Both A and R are true and R is the correct explanation of A   b) Both A and R are true but R is not the correct explanation of A  c) A is true but R is fasle  d) A is false but R is true
  5. Examine the two statements carefully and decide if the assertion A and reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Assertion A: food pipe runs through the neck and chest  Reason R: When food is not accepted by our stomach it is vomited out. a) Both A and R are true and R is the correct explanation of A   b) Both A and R are true but R is not the correct explanation of A  c) A is true but R is false  d) A is false but R is true
  6. Examine the two statements carefully and decide if the assertion A and reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Assertion A: The small intestine is about 7.5m long and highly coiled. Reason R: It is smaller as compared to large intestine a) Both A and R are true and R is the correct explanation of A   b) Both A and R are true but R is not the correct explanation of A  c) A is true but R is false  d) A is false but R is true
  7. Examine the two statements carefully and decide if the assertion A and reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Assertion A: Liver secretes a juice called bile juice. Reason R: Bile juice is stored in liver. a) Both A and R are true and R is the correct explanation of A   b) Both A and R are true but R is not the correct explanation of A  c) A is true but R is false  d) A is false but R is true
  8. Read the following two statements carefully and choose the correct option: Statement 1: Extracellular digestion takes place in small intestine  Statement 2: Digestion take place in stomach  a) Statement 1 is correct while statement2 is incorrect  b) Statement 2 is correct while statement 1 is incorrect  c) both statements are correct   d) both statements are incorrect
  9. Read the following two statements carefully and choose the correct option: Statement 1: Blood vessels and nerves of a tooth are present in pulp  Statement 2:  study of teeth is called dentistry  a) Statement 1 is correct while statement2 is incorrect  b) Statement 2 is correct while statement 1 is incorrect  c) both statements are correct   d) both statements are incorrect
  10. Read the following two statements carefully and choose the correct option: Statement1: Process of taking food from environment is called digestion Statement 2: process by which undigested food is ejected out of the body is called assimilation  a) Statement 1 is correct while statement2 is incorrect  b) Statement 2 is correct while statement 1 is incorrect  c) both statements are correct   d) both statements are incorrect

 

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