Q19 of 805 Page 180

Why is ‘nutrition’ a necessity for an organism?

Nutrition is necessary for an organism because

a. It is required to develop resistance against various diseases.


b. It is required for growth of new cells and repair of worn out cells.


c. It gives us energy for various metabolic activities of our body.


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17

Salt A commonly used in bakery products on heating converts into another salt B which is used in the manufacture of glass and a gas C is evolved. The gas C when passed through lime water, turns it milky. Identify A, B and C. Write the reaction for heating of salt A.

 18

Properties of the elements are given below. Where would you locate the following elements in the Periodic Table?

(a) A soft metal stored under kerosene


(b) An element with variable (more than one) valency stored under water.

 20

Why is the flow of signals in a synapse from axonal end of one neuron to dendritic end of another neuron but not the reverse?

 21

In human beings, the statistical probability of getting either a male or female child is 50 : 50. Give a suitable explanation.