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    •   Neha:  "Your  large intestine  will absorb     7.  Rohan performed an experiment to confirm
                            more water."                                      that exhaled air contains carbon dioxide by
                         Who is most likely correct about the effect of       blowing air into limewater. After completing
                         losing beneficial bacteria?  (Decomposition)         the activity, he wrote the following conclusion:

                                (a)  Sahil          (b)  Riya                 “Limewater  remained clear, showing that
                                                                              exhaled air does not contain carbon dioxide.”
                                (c)  Anil           (d)  Neha                 His classmates reviewed his conclusion and

                      5.  In a class activity, students observed a model      gave their opinions:
                         of the small intestine with villi.                   •   Aryan: “Your  conclusion  is  incorrect
                                                                                because limewater should turn milky.”
                                                                              •  Sana: “Your conclusion  is correct;  no
                                                                                change means no carbon dioxide.”
                                                                              •  Varun:  Your  conclusion  is  correct;
                                                                                limewater does not change colour in the
                                                                                presence of carbon dioxide
                                                                              •  Anita: “Carbon dioxide has no role in this

                         The  teacher  asked  why villi contain  many           experiment.”
                         blood vessels. Students replied:                     Who correctly identified  the mistake  in
                         •  Siya: "To digest food faster."                    Rohan’s conclusion?        (Decomposition)
                         •  Aman: "To  absorb  nutrients  and carry
                            them into the bloodstream."                             (a)  Aryan          (b)  Sana
                         •  Kanika: "To store food inside them."
                         •  Shivani: "To remove water from food."                   (c)  Varun          (d)  Anita
                         Who gave the correct reason?                      8.  Observe the figure.
                                               (Algorithmic Thinking)

                                (a)  Aman           (b)  Siya

                                (c)  Kanika         (d)  Shivani

                      6.  A student wrote:
                         “Pepsin  kills  germs  and  hydrochloric  acid
                         breaks proteins.”
                         What is the mistake?     (Abstract Thinking)

                                (a)   Pepsin should kill germs while HCl
                                   protects the stomach.                    What  real-life concept does  this  model  best

                                                                            represent?              (Pattern Recognition)
                                (b)   Hydrochloric  acid  has no role in
                                   digestion.                                       (a)  Digestion

                                (c)   The functions of pepsin                       (b)  Blood circulation
                                   and hydrochloric acid are
                                   interchanged.                                    (c)  Breathing mechanism

                                                                                    (d)  Excretion
                                (d)  There is no mistake.

                     82        Computational Thinking-7 (Science)

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