Science IX, assembly questions

Subjects: Science         Date 07^th Dec.2015         Class: IX

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1.    What are the two forms of oxygen found in the atmosphere?                      (Pages No.200-201)

Answer:

 The two forms of oxygen found in the atmosphere are:

1.       Diatomic molecular form with chemical formula O2.
2.       Triatomic molecular form with chemical formula O3.

2.    What do you mean by Biogeochemical cycles?                                                         (Page No.196)
Answer:

The cycling of chemicals between the biological and the geological world is called biogeochemical cycle.

3.    What is the difference between Global Warming and Green House Effects?          (Page No.199)

Answer :

Climate change includes any change resulting from different factors, like deforestation or an increase in greenhouse gases.

Global warming is one type of climate change, and it refers to the increasing temperature of the surface of Earth.

                                                                                                                 

4.    Fill in the blank.

            a.    Diamond and graphite found in the soil are made up of an element called                                      _____________.

Answer : carbon.                                                                                        (Page No.198)

5.    Abbreviation of the followings                                                                      (Page No.197)

1.      DNA

2.      RNA

Answer

1.      D N A - De oxy ribonucleic Acid

2.       R N A - Ribonucleic acid