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    If X stops functioning properly, which process       •   Plant B is kept in complete darkness and
                         will be affected?      (Pattern Recognition)           appears pale yellow

                                (a)   Transport of food                       What is the most  appropriate  explanation
                                                                              for the difference in colour between the two
                                (b)  Gas exchange and transpiration           plants?               (Pattern Recognition)

                                (c)  Root growth                                    (a)   The plant in darkness produces
                                                                                       more chlorophyll.
                                (d)  Seed germination

                     10.  Two identical plants are kept under different             (b)   Lack of sunlight prevents chlorophyll
                         conditions as shown:                                          formation in plant B.
                         •   Plant A is kept                                        (c)   The plant  in  sunlight loses  its
                            in    sunlight                                             pigments.
                            and appears
                            green                                                   (d)   Darkness increases photosynthesis.

                                              Plant A     Plant B

                                       A student sets up two similar experiments to test the release of carbon dioxide:
                                       Set-up A: Flask contains germinating seeds connected to lime water
                                       Set-up B: Flask contains dry seeds connected to lime water

                                               Tube A                                 Tube A
                                                                     Lime water                             Lime water

                                            Tube B                                  Tube B
                                       Germinating                                  Dry
                                          seeds                                    seeds
                                                        Set-up A                                 Set-up B
                                       Observation: The lime water in set-up A turns milky, while in set-up B it remains
                                       clear.
                                       What is the best explanation for the difference in observations between the two
                                       setups?

                                             (a)   Germinating seeds release oxygen, while dry seeds release carbon
                                                 dioxide.

                                             (b)   Dry seeds do not respire, while germinating seeds respire actively and
                                                 release carbon dioxide.
                                             (c)  Lime water reacts only with dry seeds.

                                             (d)  Dry seeds absorb carbon dioxide from lime water.

                     86        Computational Thinking-7 (Science)

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