Question

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Answer 1

Answer:

1 . hydrogen

2.the series of processes by which nitrogen and its compounds are interconverted in the environment and in living organisms, including nitrogen fixation and decomposition.

3.Swedish chemist, Carl Wilhelm Scheele

4.

6.

7.Invert this tumbler over the burning candle. Observation - The candle burns for some time and is then extinguished. The water rises from the edge of the inverted tumbler to occupy about one-fifth of it. The candle burnt till oxygen was present, Once the oxygen inside the tumbler was used up, it stopped burning.

Answer 2

Answer:

Dear Student, Iodine is an essential element of thyroid hormone. The thyroid hormone with its essential iodine constituent is responsible for the control of metabolism and also for metamorphosis. The major function of the thyroid gland is to produce thyroid hormone in an amount sufficient to meet the