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Q19 of 805 Page 194

What will happen if the mucus is not secreted by the gastric glands?

The mucus protects the walls of gastric glands from the acids and enzymes secreted by them due to its alkaline nature. If the mucus is not secreted, then the walls of gastric glands will be digested by the acids.


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17

A non-metal A is an important constituent of our food and forms two oxides B and C. Oxide B is toxic whereas C causes global warming

(a) Identify A, B and C


(b) To which Group of periodic table A belongs?

18

Atomic number of a few elements are given below

(i) 10 (ii) 20


(iii) 7 (iv) 14


(a) Identify the elements


(b) Identify the period to which these elements belong

20

Name the plant hormones responsible for the following

(a) elongation of cells


(b) growth of stem


(c) promotion of cell division


(d) falling of senescent leaves

21

How are general growth and sexual maturation different from each other?

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