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Digestion and Absorption

Long Answer Type

121. Draw a labelled diagram of open buccal cavity.

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122. Differentiate between digestive tracts of carnivores and herbivores.

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123. Comment upon large intestine.

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124. Write a brief note on salivary glands.

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Multiple Choice Questions

125. Gastric juice contains.

Pepsin, lipase and rennin.
trypsin, lipase and rennin.
trypsin, pepsin and lipase.
trypsin, pepsin and renin.

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126. Succus entericus is the name given to

a junction between ileum and large intestine.
intestinal juice
swelling in the gut
appendix

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Match The Following

127. Match the following :

A. Bilirubin and biliverdin	(i) Parotid
B. Hydrolysis of starch	(ii) Bile
C. Digestion of fat	(iii) Lipases
D. Salivary gland	(iv) Amylases

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Short Answer Type

128. (a) Why are villi present in the intestine and not in stomach.

(a) Major portion of absorption of food takes place in small intestine. Absorption in small intestine is also important because digestion is almost complete by the time food reaches ileum. Villi increase the absorptive surface area for the absorption of digested food. The digested food is present in intestine only. The digested food is not present in stomach, therefore in this part there is no need of villi and thus, they are absent.

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129. (b) How does pepsinogen change into its active form ?

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130. (d) How does bile help in the digestion of fats ?

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