Page 1 - 3- Home Assignment II (worksheet)- Mineral riches in the soil
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SAI International School
                                                 Subject- Biology
                                          Chapter- Natural Resources
                                     Subtopic- Mineral riches in the soil
                                                     Module- 32
                                              Home Assignment – II

                                                    WORKSHEET-1
                 Q1.  Topsoil contains
                        (a) living organisms only
                        (b) humus and soil particles only
                        (c) dead organisms and living plants
                        (d) humus, living organisms and soil particles.
                 Q2.  What is air composed of?
                        (a) Nitrogen, oxygen, methane, carbon-dioxide and noble
                        (b) Nitrogen, oxygen, carbon-dioxide, water vapours and gases
                        (c) Nitrogen, carbon-dioxide, oxygen, carbon monoxide and gases
                        (d) Nitrogen, oxygen, carbon monoxide, water vapours and gases
                 Q3.  Which one of the following is an inexhaustible resource?
                        (a) Fossil fuels
                        (b) Minerals
                        (c) Soil
                        (d) Solar radiation
                        DIRECTION : Question nos. 4 and 5 below consist of two statements -
                        Assertion (A) and Reason (R). Answer these questions selecting the
                        appropriate option given below:
                        a)  Both A and R are true and R is the correct explanation of A.
                        b)  Both A and R are true but R is not the correct explanation of A.
                        c)  A is true but R is false.
                        d)  A is false but R is true.
                        e)  Both Assertion and Reason are false.
                 Q4.  Assertion: : Like Earth, Moon and Venus also have atmosphere.
                        Reason: The atmosphere on Moon and Venus mainly comprises of carbon
                        dioxide.
                 Q5.  Assertion: Nodules are found only in the roots of leguminous plants.
                        Reason:  Rhizobium  is  a  symbiotic  bacteria  that  live  in  the  roots  of
                        legumes.
                 Q6.  What makes acid rain?
                 Q7.  Why does the moon have very cold and very hot temperature variations
                        e.g., from -190°C to 110°C even though it is at the same distance from the
                        sun as the earth is?
                 Q8.  What do you mean by BOD? Explain.
                 Q9.  Explain in detail how water pollution affects aquatic life?
                 Q10.  In the coastal areas, wind current moves from the sea towards the land during
                        the day; but during the night it moves from land to the sea. Discuss the reason.
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