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When a person puts food in his mouth, then teeth cut it into small pieces, shew 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 enters the stomach with food. The substance G protects the inside layer fo 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) D ?

2mL of ethanoic acid was taken in each of test tube I and test tube II. A red litmus paper was introduced in test tube I and a pH paper was introduced in test tube II. The experiment was performed by four students A,B,C and D and they reported their observations as given below: The correct set of observations was made by the student:

Read the following statements (A - D) : 1. Catecholamines secreted from adrenal medulla stimulate breakdown of glycogen resulting in an increased concentration of glucose in blood. 2. Cortisol is also involved in maintaining the cardio -vascular syem as well as kidney functions. 3. Hormone released from zona fasciculate produce anti-inflammatroy reactions and suppresses the immune response. 4. Androgenic steroids secreted by adrenal cortex play a role in growth of axial hair, pubic hair and facial hair during puberty. How many of the above statements are ture?

If the teeth are not cleaned regularly, they become covered with a sticky yellowish laryer W of food particles and bacteria. Since layer W covers the teeth, the alkaline liquid X secreted by glands Y inside the mouth cannot reach the teeth surface to neutralise the acid formed by the action of organisms Z on sugary food, and hence tooth decays sets in (a) What is W known as ? (b) What is (i) X, and (ii) Y ? (c) What are organisms Z ? (d) State one way of removing layer W from the teeth

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