Section B

EXERCISE 1

1) Diagram 1 shows two pots of plants, P and Q, which are kept in different places. P is placed outside the laboratory while Q is kept inside the laboratory. After two weeks, plant P is still alive while plant Q is dead.

                                                            P                               Q

                                                                         Diagram 1
 (a) What is the aim of this investigation?
     ________________________________________________
     ________________________________________________
                                                                                                                    (1 mark)

(b) In this investigation, state what is
     (i) changed:
         _______________________________________________
      _______________________________________________
     (ii) kept the same:
       _______________________________________________
      _______________________________________________
                                                                                                                    (2 marks)

(c) Explain why plant Q died.
     _________________________________________________
   _________________________________________________
                                                                                                                     (1 mark)

(d) What conclusion can you make from the investigation?
      _________________________________________________
     _________________________________________________
                                                                              (1 mark)



EXERCISE 2

1) Diagram 1 shows three objects made of different materials.
                  

                   P                                                                                     Q

    








R






    (a) What materials can be used to make the main part in objects P, Q and R?
          (i)    P: ______________________________________________

          (ii)   Q: ______________________________________________

          (iii)  R: ______________________________________________
                                                                                               (3 marks)

    (b) State the reasons for your answers in (a).
         (i) P: ______________________________________________
                  ______________________________________________

        (ii) Q: ______________________________________________
                   ______________________________________________

        (iii) R: ______________________________________________
                    ______________________________________________
                                                                                               (3 marks)

   (c) (i)  What material can be used to make a sweater?
         ____________________________________________________
         ____________________________________________________
                                                                                                (1 mark)

        (ii)  What is your reason for your choice?
         ____________________________________________________
         ____________________________________________________
                                                                                                 (1 mark)

    (d) State two objects which are made of the same material as Q is.
          ____________________________________________________
         ____________________________________________________
                                                                                                  (1 mark)