Class vii science chapter 2 NUTRITION IN ANIMALS

                            SUBHAM TUTORIAL
                    

                                  class vii
                                  chapter 2                                                             NUTRITION IN ANIMALS

Question 1 :
Fill in the blanks:
(a) The main steps of digestion in humans are -----------, ----------, ----------, ----------
and ---------.
(b) The largest gland in the human body is -------------.
(c) The stomach releases hydrochloric acid and ------------ juice 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 --------------.

Answer1.
(a) The main steps of digestion 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 gastric juice 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.

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 temporally stores bile. (T/F)
(d) The ruminants bring back swallowed grass into their mouth and chew it for some
time. (T/F)
Answer2.      (a) F (b) T (c) T (d) T

Question 3. Tick ( ) mark the correct answers in each of the following:
(a) Fat is completely digested in the
(i) Stomach (ii) mouth
(iii) Small intestine (iii) large intestine.

Answer3.  (a) (iii) small intestine.
                   (b) (iv) large intestine.

Question 4: the item of Column I with those given in Column II.
  Column l                                                column ll
Food components                      product of digestion
Carbohydrates .                   Fatty acids and glycerol
Proteins                                             Sugar
Fats .                                                 Amino Acids
Answer 4.
    Column l                                           Column ll 
Food components.                 Product ofdigestion
 Carbohydrates ----------------------------sugar
     Proteins ------------------------------------amino acid
        Fats ------------------------------fatty acid andglycerol
Question 5 :  what are villi? What is their location and function?
Answer 5.
The inner wall of the small intestine have thousands of finger-like outgrowths. These
are called villi. Villi are located in the small intestine. The villi increase the surface
area for absorption of the digested food. Each villus has a network of thin and small
blood vessels close to its surface. The surface of the villi absorbs the digested food
materials.
Question 6:where is the bile produced? Which component of the food does it digest?

Answer 6: Bile is produced by liver and is stored in gall bladder. Bile juice digests fat.

Question 7: Name the carbohydrate that can be digested by ruminants but not the human beings.
Give the reason also.

Answer 7:. Cellulose can be digested by ruminants but not by human beings. The human being do not produce cellulose digesting enzyme.

Question 8: Name the type of carbohydrate that can be digested by ruminants but not by
humans. Give the reason also.
Answer 8 :
       cellulose is a type of carbohydrate that can be   digested by ruminants but not by  humans.    Ruminants have a large sac-like structure called rumen which is present inbetween the small intestine and large intestine. The cellulose is digested here by the
action of certain bacteria which are not present in humans.

.Question 9: Why do we get instant energy from glucose?

Answer 9 : Glucose is the simplest form of carbohydrate which can be broken easily to give
energy. So, glucose is called instant energizer.

Question 10: 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 -----------.
Answer 10:
(i) small intestine
(ii) buccal cavity
(iii) stomach
(iv) small intestine
(v) large intestine

Question 11: write one similarity and one difference between the nutrition in amoeba and human
beings.
Answer 11 :Similarity: Both amoeba and human use digestive juices to digest food.
Difference: Human needs to chew food, whereas in amoeba, there is no chewing.
Question 12: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.
Answer12:(a) (iii)
                     (b) (iv)
                     (c) (i)
                    (d) (v)
                    (e)(ii)
                    (f) (vi)

Question 13 :  Label fig. 2.2 of the digestive system.

Answer 13:

                             ( Digestive system)

Question 14 : Can we survive only on raw, leafy vegetables/grass? Discuss.

Answer 14:, because to live alive a healthy life we need a complete balance of all nutrients.
Raw green vegetables may have cellulose which cannot be digested by us. So, only
green leafy vegetables will not solve the purpose
 

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