Q27 of 30 Page 11

Read the following passage carefully and answer the questions that follows it. Bile juice is stored in a sac called, gall bladder, located near its organ of secretion, liver. The gall bladder releases the bile juice into the small intestine whenever food reaches there. Though bile juice is devoid of any digestive enzymes, it is required for the digestion of fats. The fats cannot be digested easily because they are insoluble in water and are present as large globules. Bile juice breaks down big fat droplets into smaller droplets. These are then easily digested by the enzymes released from the pancreas.

(a) Which organ secretes the bile juice?


(b) Why is digestion of fats difficult as compared to that of other nutrients?


(c) How does bile juice help in digestion of fat?


(d) Where is the digestion of fat completed?


(e) Does bile juice digest fat completely?

(a) Liver, the largest gland of the human body produces bile juice which gets stored in gall bladder and used when required.

(b) Digestion of fats is difficult because they are water insoluble and are present as large globules.


(c) Bile juice helps in emulsification of fats which means breakdown of larger fat molecules into smaller ones. This way bile juice helps in digestion of fat molecules.


(d) The digestion of fats get completed in small intestine. Fat emulsification is done by bile juice, which is secreted by liver, stored in gall bladder, and released in small intestine. As it is released in small intestine, fat emulsification gets completed in small intestine only.


(e) No, bile juice do not help in digestion of fat completely but it converts the bigger fat molecules into smaller droplets which makes it easier to get digested.


More from this chapter

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25

Fill in the blanks using the words listed below.

water, front, intestinal, salts, pseudopodia, back, vacuole


(a) The digestion of all food components is completed by the ____________ juice.


(b) Large intestine absorbs ___________ and some __________ from the undigested food.


(c) Tongue is attached at the _____________ to the floor of the mouth cavity and is free at the _____________.


(d) Amoeba pushes out _____________ around the food and traps it in a food _____________.

26

Label the below given Figure 2.1 as directed below in (i) to (iv) and give the name of each type of teeth.


(i) The cutting and biting teeth as ‘A’


(ii) The piercing and tearing teeth as ‘B’


(iii) The grinding and chewing teeth as ‘C’


(iv)The grinding teeth present only in adult as ‘D’

28

Label the following parts in Figure 2.2 and name them.


(a) The largest gland in our body.


(b) The organ where protein digestion starts.


(c) The organ that releases digestive juice into the small intestine.


(d) The organ where bile juice gets stored.

29

Open your mouth, look into a mirror and try to count the different types of teeth in your mouth. Compare them with Figure 2.3 on page 13 of your NCERT textbook. Record your observations in the table below:


(a) Did you observe any difference in the number of teeth? If yes, could you identify which type of teeth showed the difference?


(b) Compare the number and type of teeth in an adult (say your parents or cousins who have reached the age of 25–30 or more). Note your observation.