DIGESTION AND ABSORPTION

1. a) Observe the diagram and label A and B. (Score 2)

b) Dental formula of permanent teeth in man is ………

i) 2122/2122

ii) 2123/2123

iii) 2102/2102

iv) 2122/2022

Answer:

(a) A- Canine, B- Molars

(b) ii) 2123/2123

2. Give one word for the following. (Score 2)

       a. Presence of 2 sets of teeth in the lifetime.
       b. Teeth are present in the socket of Jaw bone.
       c. Presence of different types of teeth.

Answer:

(a) Diphyodont

(b) Thecodont

3. Observe the following figure.

a. Name the figure.

b. Label the parts A, B and D. (Score 2)

Answer:

(a) Transverse section of the human gut.

(b) A- Serosa, B- Muscularis, D- Mucosa

4. Certain indicators regarding the layers in the wall of the alimentary canal are given. Name the layer against the indicator. (Score 2)

       a. Formed of loose connective tissue containing nerves and blood vessels.
       b. Inner most lining forms the rugae in the stomach.
       c. Formed by smooth muscles.
       d. Outermost layer made up of mesothelium.

Answer:

(a) Submucosa

(b) Mucosa

(d) Serosa

5. Odd one out. Justify your answer. (Score 2)

Dipeptidase, lipase, Carboxypeptidase, nucleosidase

Answer:

Carboxypeptidase.

Because it is found in pancreatic juice. Others are found in intestinal juice.

6. “The mucus and bicarbonates present in the gastric juice have an important role.” Justify. (Score 2)

Answer:

They have an important role in lubrication and protection of the mucosal epithelium from the action of concentrated HCl.

7. Complete the following flowchart:

Answer:

A= Enterokinin, B= Chymotrypsinogen

C= Trypsin, D= Carboxypeptidase.

8. Match the following: (Score 3)

A	B
a. Jaundice	Medulla oblongata
b. Vomiting	Feeling of fullness
c. Diarrhoea	Skin and eye turn yellow
d. Constipation	Marasmus & Kwashiorkor
e. Indigestion	Reduces the absorption of food
f. PEM	Decreased peristalsis in colon

Answer:

A	B
a. Jaundice	Skin and eye turn yellow
b. Vomiting	Medulla oblongata
c. Diarrhoea	Reduces the absorption of food
d. Constipation	Decreased peristalsis in colon
e. Indigestion	Feeling of fullness
f. PEM	Marasmus & Kwashiorkor

Focus Area 2021 | Questions and Answers | Plus One Zoology | Digestion and Absorption

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