Question

4
When a person puts food in his mouth, then teeth cut it into small pieces, chew and grind it. The glands A in the mouth secrete a substance B which is mixed with the food by tongue. The substance B contains an enzyme C which starts the digestion of food in the mouth. The slightly digested food from the mouth goes down a tube D. The special type of movements E in the walls of tube D push the food into stomach for further digestion. The stomach wall secretes gastric juice containing three substance F, G and H. One of the functions of F is to kill bacteria which may enter the stomach with food. The substance G protects the inside layer of stomach from the damaging effect of substance F whereas substance H is an enzyme for digestion. The partially digested food then enters into small intestine for further digestion.
(a) What is (i) gland A (ii) substance B, and (iii) enzyme C?
(b) Name the tube D.
(c) What is the movement E known as?
(d) What are (i) F (ii) G, and (iii) H?

Answer 1

Answer:

gland A is

salivary gland

substance B is

saliva

enzyme C salivary amlyse

tube D is oesophagus

movement on E is the wall expands

Answer 2

Answer:

A- salivary gland B- saliva C- salivary amylase

B-oesophagus

C- peristaltic movement

D- f- HCL g- mucus ,h- pepsin