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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.

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

Pepsinogen is a proenzyme secreted by chief cells. It is converted into active form i.e pepsin by HCl. HCl provides the optimum pH for the enzyme pepsin. Once pepsin is formed it itself converts pepsinogen into pepsin. This proces is called autocatalysis. 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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